commit 6881788cab416688453cdc2f8fe24aacef68f492 · kitten.sh/wonka

package.json

···

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           ]

     

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         },

     

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         "jest": {

     

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           "testRegex": "(src/.*(\\.|/)(test|spec))\\.ts$",

     

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           "transform": {

     

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             "^.+\\.tsx?$": "@sucrase/jest-plugin"

     

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           }

+404

src/__tests__/compliance.ts

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       import { Source, Sink, Operator, Signal, SignalKind, TalkbackKind, TalkbackFn } from '../types';

     

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       import { push, start } from '../helpers';

     

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       /* This tests a noop operator for passive Pull talkback signals.

     

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         A Pull will be sent from the sink upwards and should pass through

     

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         the operator until the source receives it, which then pushes a

     

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         value down. */

     

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       export const passesPassivePull = (operator: Operator<any, any>, output: any = 0) => {

     

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         it('responds to Pull talkback signals (spec)', () => {

     

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           let talkback: TalkbackFn | null = null;

     

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           let pushes = 0;

     

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           const values: any[] = [];

     

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       +
       

     

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           const source: Source<any> = sink => {

     

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             sink(

     

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               start(signal => {

     

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                 if (!pushes && signal === TalkbackKind.Pull) {

     

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                   pushes++;

     

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                   sink(push(0));

     

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                 }

     

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               })

     

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             );

     

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           };

     

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       +
       

     

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           const sink: Sink<any> = signal => {

     

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             expect(signal).not.toBe(SignalKind.End);

     

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             if (signal === SignalKind.End) {

     

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               /*noop*/

     

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             } else if (signal.tag === SignalKind.Push) {

     

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               values.push(signal[0]);

     

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             } else {

     

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               talkback = signal[0];

     

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             }

     

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           };

     

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       +
       

     

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           operator(source)(sink);

     

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           // The Start signal should always come in immediately

     

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           expect(talkback).not.toBe(null);

     

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           // No Push signals should be issued initially

     

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           expect(values).toEqual([]);

     

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       +
       

     

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           // When pulling a value we expect an immediate response

     

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           talkback!(TalkbackKind.Pull);

     

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           jest.runAllTimers();

     

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           expect(values).toEqual([output]);

     

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         });

     

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       };

     

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       +
       

     

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       /* This tests a noop operator for regular, active Push signals.

     

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         A Push will be sent downwards from the source, through the

     

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         operator to the sink. Pull events should be let through from

     

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         the sink after every Push event. */

     

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       export const passesActivePush = (operator: Operator<any, any>, result: any = 0) => {

     

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         it('responds to eager Push signals (spec)', () => {

     

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           const values: any[] = [];

     

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           let talkback: TalkbackFn | null = null;

     

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           let sink: Sink<any> | null = null;

     

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           let pulls = 0;

     

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       +
       

     

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           const source: Source<any> = _sink => {

     

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             (sink = _sink)(

     

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               start(signal => {

     

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                 if (signal === TalkbackKind.Pull) pulls++;

     

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               })

     

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             );

     

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           };

     

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       +
       

     

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           operator(source)(signal => {

     

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             expect(signal).not.toBe(SignalKind.End);

     

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             if (signal === SignalKind.End) {

     

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               /*noop*/

     

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             } else if (signal.tag === SignalKind.Start) {

     

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               talkback = signal[0];

     

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             } else if (signal.tag === SignalKind.Push) {

     

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               values.push(signal[0]);

     

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               talkback!(TalkbackKind.Pull);

     

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             }

     

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           });

     

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           // No Pull signals should be issued initially

     

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           expect(pulls).toBe(0);

     

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           // When pushing a value we expect an immediate response

     

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           sink!(push(0));

     

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           jest.runAllTimers();

     

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           expect(values).toEqual([result]);

     

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           // Subsequently the Pull signal should have travelled upwards

     

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           expect(pulls).toBe(1);

     

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         });

     

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       };

     

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       /* This tests a noop operator for Close talkback signals from the sink.

     

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         A Close signal will be sent, which should be forwarded to the source,

     

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         which then ends the communication without sending an End signal. */

     

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       export const passesSinkClose = (operator: Operator<any, any>) => {

     

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         it('responds to Close signals from sink (spec)', () => {

     

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           let talkback: TalkbackFn | null = null;

     

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           let closing = 0;

     

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           const source: Source<any> = sink => {

     

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             sink(

     

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               start(signal => {

     

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                 if (signal === TalkbackKind.Pull && !closing) {

     

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                   sink(push(0));

     

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                 } else if (signal === TalkbackKind.Close) {

     

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                   closing++;

     

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                 }

     

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               })

     

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             );

     

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           };

     

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           const sink: Sink<any> = signal => {

     

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             expect(signal).not.toBe(SignalKind.End);

     

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             if (signal === SignalKind.End) {

     

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               /*noop*/

     

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             } else if (signal.tag === SignalKind.Push) {

     

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               talkback!(TalkbackKind.Close);

     

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             } else {

     

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               talkback = signal[0];

     

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             }

     

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           };

     

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           operator(source)(sink);

     

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           // When pushing a value we expect an immediate close signal

     

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           talkback!(TalkbackKind.Pull);

     

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           jest.runAllTimers();

     

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           expect(closing).toBe(1);

     

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         });

     

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       };

     

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       /* This tests a noop operator for End signals from the source.

     

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         A Push and End signal will be sent after the first Pull talkback

     

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         signal from the sink, which shouldn't lead to any extra Close or Pull

     

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         talkback signals. */

     

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       export const passesSourceEnd = (operator: Operator<any, any>, result: any = 0) => {

     

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         it('passes on immediate Push then End signals from source (spec)', () => {

     

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           const signals: Signal<any>[] = [];

     

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           let talkback: TalkbackFn | null = null;

     

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           let pulls = 0;

     

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           let ending = 0;

     

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       +
       

     

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           const source: Source<any> = sink => {

     

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             sink(

     

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               start(signal => {

     

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                 expect(signal).not.toBe(TalkbackKind.Close);

     

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                 if (signal === TalkbackKind.Pull) {

     

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                   pulls++;

     

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                   if (pulls === 1) {

     

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                     sink(push(0));

     

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                     sink(SignalKind.End);

     

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                   }

     

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                 }

     

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               })

     

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             );

     

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           };

     

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           const sink: Sink<any> = signal => {

     

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             if (signal === SignalKind.End) {

     

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               signals.push(signal);

     

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               ending++;

     

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             } else if (signal.tag === SignalKind.Push) {

     

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               signals.push(signal);

     

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             } else {

     

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               talkback = signal[0];

     

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             }

     

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           };

     

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           operator(source)(sink);

     

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           // When pushing a value we expect an immediate Push then End signal

     

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           talkback!(TalkbackKind.Pull);

     

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           jest.runAllTimers();

     

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           expect(ending).toBe(1);

     

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           expect(signals).toEqual([push(result), SignalKind.End]);

     

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           // Also no additional pull event should be created by the operator

     

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           expect(pulls).toBe(1);

     

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         });

     

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       };

     

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       /* This tests a noop operator for End signals from the source

     

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         after the first pull in response to another.

     

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         This is similar to passesSourceEnd but more well behaved since

     

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         mergeMap/switchMap/concatMap are eager operators. */

     

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       export const passesSourcePushThenEnd = (operator: Operator<any, any>, result: any = 0) => {

     

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         it('passes on End signals from source (spec)', () => {

     

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           const signals: Signal<any>[] = [];

     

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           let talkback: TalkbackFn | null = null;

     

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           let pulls = 0;

     

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           let ending = 0;

     

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       +
       

     

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           const source: Source<any> = sink => {

     

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             sink(

     

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               start(signal => {

     

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                 expect(signal).not.toBe(TalkbackKind.Close);

     

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                 if (signal === TalkbackKind.Pull) {

     

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                   pulls++;

     

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                   if (pulls <= 2) {

     

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                     sink(push(0));

     

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                   } else {

     

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                     sink(SignalKind.End);

     

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                   }

     

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                 }

     

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               })

     

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             );

     

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           };

     

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       +
       

     

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           const sink: Sink<any> = signal => {

     

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       +
             if (signal === SignalKind.End) {

     

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               signals.push(signal);

     

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               ending++;

     

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             } else if (signal.tag === SignalKind.Push) {

     

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               signals.push(signal);

     

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               talkback!(TalkbackKind.Pull);

     

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             } else {

     

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               talkback = signal[0];

     

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             }

     

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           };

     

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       +
       

     

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           operator(source)(sink);

     

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       +
       

     

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           // When pushing a value we expect an immediate Push then End signal

     

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       +
           talkback!(TalkbackKind.Pull);

     

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       +
           jest.runAllTimers();

     

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       +
           expect(ending).toBe(1);

     

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       +
           expect(pulls).toBe(3);

     

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       +
           expect(signals).toEqual([push(result), push(result), SignalKind.End]);

     

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       +
         });

     

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       +
       };

     

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       +
       

     

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       /* This tests a noop operator for Start signals from the source.

     

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         When the operator's sink is started by the source it'll receive

     

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         a Start event. As a response it should never send more than one

     

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         Start signals to the sink. */

     

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       export const passesSingleStart = (operator: Operator<any, any>) => {

     

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       +
         it('sends a single Start event to the incoming sink (spec)', () => {

     

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       +
           let starts = 0;

     

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       +
       

     

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       +
           const source: Source<any> = sink => {

     

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       +
             sink(start(() => {}));

     

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       +
           };

     

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       +
       

     

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       +
           const sink: Sink<any> = signal => {

     

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       +
             if (signal !== SignalKind.End && signal.tag === SignalKind.Start) {

     

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       +
               starts++;

     

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       +
             }

     

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       +
           };

     

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       +
       

     

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       +
           // When starting the operator we expect a single start event on the sink

     

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       +
           operator(source)(sink);

     

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       +
           expect(starts).toBe(1);

     

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       +
         });

     

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       +
       };

     

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       +
       

     

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       +
       /* This tests a noop operator for silence after End signals from the source.

     

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         When the operator receives the End signal it shouldn't forward any other

     

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       +
         signals to the sink anymore.

     

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       +
         This isn't a strict requirement, but some operators should ensure that

     

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       +
         all sources are well behaved. This is particularly true for operators

     

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       +
         that either Close sources themselves or may operate on multiple sources. */

     

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       +
       export const passesStrictEnd = (operator: Operator<any, any>) => {

     

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       +
         it('stops all signals after End has been received (spec: strict end)', () => {

     

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       +
           let pulls = 0;

     

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       +
           const signals: Signal<any>[] = [];

     

       265
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       +
       

     

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       +
           const source: Source<any> = sink => {

     

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       +
             sink(

     

       268
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       +
               start(signal => {

     

       269
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       +
                 if (signal === TalkbackKind.Pull) {

     

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       +
                   pulls++;

     

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       +
                   sink(SignalKind.End);

     

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       +
                   sink(push(123));

     

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       +
                 }

     

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       +
               })

     

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       +
             );

     

       276
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       +
           };

     

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       +
       

     

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       +
           const sink: Sink<any> = signal => {

     

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       +
             if (signal === SignalKind.End) {

     

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       +
               signals.push(signal);

     

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       +
             } else if (signal.tag === SignalKind.Push) {

     

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       +
               signals.push(signal);

     

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       +
             } else {

     

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       +
               signal[0](TalkbackKind.Pull);

     

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       +
             }

     

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       +
           };

     

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       +
       

     

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       +
           operator(source)(sink);

     

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       +
       

     

       290
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       +
           // The Push signal should've been dropped

     

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       +
           jest.runAllTimers();

     

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       +
           expect(signals).toEqual([SignalKind.End]);

     

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       +
           expect(pulls).toBe(1);

     

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       +
         });

     

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       +
       

     

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       +
         it('stops all signals after Close has been received (spec: strict close)', () => {

     

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       +
           const signals: Signal<any>[] = [];

     

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       +
       

     

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       +
           const source: Source<any> = sink => {

     

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       +
             sink(

     

       301
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       +
               start(signal => {

     

       302
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       +
                 if (signal === TalkbackKind.Close) {

     

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       +
                   sink(push(123));

     

       304
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       +
                 }

     

       305
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       +
               })

     

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       +
             );

     

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       +
           };

     

       308
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       +
       

     

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       +
           const sink: Sink<any> = signal => {

     

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       +
             if (signal === SignalKind.End) {

     

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       +
               signals.push(signal);

     

       312
       312
       +
             } else if (signal.tag === SignalKind.Push) {

     

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       +
               signals.push(signal);

     

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       +
             } else {

     

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       +
               signal[0](TalkbackKind.Close);

     

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       +
             }

     

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       +
           };

     

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       +
       

     

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       +
           operator(source)(sink);

     

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       +
       

     

       321
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       +
           // The Push signal should've been dropped

     

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       +
           jest.runAllTimers();

     

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       +
           expect(signals).toEqual([]);

     

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       +
         });

     

       325
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       +
       };

     

       326
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       +
       

     

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       +
       /* This tests an immediately closing operator for End signals to

     

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       +
         the sink and Close signals to the source.

     

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       +
         When an operator closes immediately we expect to see a Close

     

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       +
         signal at the source and an End signal to the sink, since the

     

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       +
         closing operator is expected to end the entire chain. */

     

       332
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       +
       export const passesCloseAndEnd = (closingOperator: Operator<any, any>) => {

     

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       333
       +
         it('closes the source and ends the sink correctly (spec: ending operator)', () => {

     

       334
       334
       +
           let closing = 0;

     

       335
       335
       +
           let ending = 0;

     

       336
       336
       +
       

     

       337
       337
       +
           const source: Source<any> = sink => {

     

       338
       338
       +
             sink(

     

       339
       339
       +
               start(signal => {

     

       340
       340
       +
                 // For some operator tests we do need to send a single value

     

       341
       341
       +
                 if (signal === TalkbackKind.Pull) {

     

       342
       342
       +
                   sink(push(null));

     

       343
       343
       +
                 } else {

     

       344
       344
       +
                   closing++;

     

       345
       345
       +
                 }

     

       346
       346
       +
               })

     

       347
       347
       +
             );

     

       348
       348
       +
           };

     

       349
       349
       +
       

     

       350
       350
       +
           const sink: Sink<any> = signal => {

     

       351
       351
       +
             if (signal === SignalKind.End) {

     

       352
       352
       +
               ending++;

     

       353
       353
       +
             } else if (signal.tag === SignalKind.Start) {

     

       354
       354
       +
               signal[0](TalkbackKind.Pull);

     

       355
       355
       +
             }

     

       356
       356
       +
           };

     

       357
       357
       +
       

     

       358
       358
       +
           // We expect the operator to immediately end and close

     

       359
       359
       +
           closingOperator(source)(sink);

     

       360
       360
       +
           expect(closing).toBe(1);

     

       361
       361
       +
           expect(ending).toBe(1);

     

       362
       362
       +
         });

     

       363
       363
       +
       };

     

       364
       364
       +
       

     

       365
       365
       +
       export const passesAsyncSequence = (operator: Operator<any, any>, result: any = 0) => {

     

       366
       366
       +
         it('passes an async push with an async end (spec)', () => {

     

       367
       367
       +
           let hasPushed = false;

     

       368
       368
       +
           const signals: Signal<any>[] = [];

     

       369
       369
       +
       

     

       370
       370
       +
           const source: Source<any> = sink => {

     

       371
       371
       +
             sink(

     

       372
       372
       +
               start(signal => {

     

       373
       373
       +
                 if (signal === TalkbackKind.Pull && !hasPushed) {

     

       374
       374
       +
                   hasPushed = true;

     

       375
       375
       +
                   setTimeout(() => sink(push(0)), 10);

     

       376
       376
       +
                   setTimeout(() => sink(SignalKind.End), 20);

     

       377
       377
       +
                 }

     

       378
       378
       +
               })

     

       379
       379
       +
             );

     

       380
       380
       +
           };

     

       381
       381
       +
       

     

       382
       382
       +
           const sink: Sink<any> = signal => {

     

       383
       383
       +
             if (signal === SignalKind.End) {

     

       384
       384
       +
               signals.push(signal);

     

       385
       385
       +
             } else if (signal.tag === SignalKind.Push) {

     

       386
       386
       +
               signals.push(signal);

     

       387
       387
       +
             } else {

     

       388
       388
       +
               setTimeout(() => {

     

       389
       389
       +
                 signal[0](TalkbackKind.Pull);

     

       390
       390
       +
               }, 5);

     

       391
       391
       +
             }

     

       392
       392
       +
           };

     

       393
       393
       +
       

     

       394
       394
       +
           // We initially expect to see the push signal

     

       395
       395
       +
           // Afterwards after all timers all other signals come in

     

       396
       396
       +
           operator(source)(sink);

     

       397
       397
       +
           expect(signals.length).toBe(0);

     

       398
       398
       +
           jest.advanceTimersByTime(5);

     

       399
       399
       +
           expect(hasPushed).toBeTruthy();

     

       400
       400
       +
           jest.runAllTimers();

     

       401
       401
       +
       

     

       402
       402
       +
           expect(signals).toEqual([push(result), SignalKind.End]);

     

       403
       403
       +
         });

     

       404
       404
       +
       };

+13 -403

src/__tests__/operators.test.ts

···

       1
       1
       -
       import { Source, Sink, Operator, Signal, SignalKind, TalkbackKind, TalkbackFn } from '../types';

     

       1
       1
       +
       import { Source, Sink, Signal, SignalKind, TalkbackKind, TalkbackFn } from '../types';

     

       2
       2
        
       import { push, start } from '../helpers';

     

       3
       3
        
       

     

       4
       4
       +
       import {

     

       5
       5
       +
         passesPassivePull,

     

       6
       6
       +
         passesActivePush,

     

       7
       7
       +
         passesSinkClose,

     

       8
       8
       +
         passesSourceEnd,

     

       9
       9
       +
         passesSingleStart,

     

       10
       10
       +
         passesStrictEnd,

     

       11
       11
       +
         passesSourcePushThenEnd,

     

       12
       12
       +
         passesAsyncSequence,

     

       13
       13
       +
         passesCloseAndEnd,

     

       14
       14
       +
       } from './compliance';

     

       15
       15
       +
       

     

       4
       16
        
       import * as sources from '../sources';

     

       5
       17
        
       import * as sinks from '../sinks';

     

       6
       18
        
       import * as operators from '../operators';

     

       7
       7
       -
       

     

       8
       8
       -
       /* This tests a noop operator for passive Pull talkback signals.

     

       9
       9
       -
         A Pull will be sent from the sink upwards and should pass through

     

       10
       10
       -
         the operator until the source receives it, which then pushes a

     

       11
       11
       -
         value down. */

     

       12
       12
       -
       const passesPassivePull = (operator: Operator<any, any>, output: any = 0) => {

     

       13
       13
       -
         it('responds to Pull talkback signals (spec)', () => {

     

       14
       14
       -
           let talkback: TalkbackFn | null = null;

     

       15
       15
       -
           let pushes = 0;

     

       16
       16
       -
           const values: any[] = [];

     

       17
       17
       -
       

     

       18
       18
       -
           const source: Source<any> = sink => {

     

       19
       19
       -
             sink(

     

       20
       20
       -
               start(signal => {

     

       21
       21
       -
                 if (!pushes && signal === TalkbackKind.Pull) {

     

       22
       22
       -
                   pushes++;

     

       23
       23
       -
                   sink(push(0));

     

       24
       24
       -
                 }

     

       25
       25
       -
               })

     

       26
       26
       -
             );

     

       27
       27
       -
           };

     

       28
       28
       -
       

     

       29
       29
       -
           const sink: Sink<any> = signal => {

     

       30
       30
       -
             expect(signal).not.toBe(SignalKind.End);

     

       31
       31
       -
             if (signal === SignalKind.End) {

     

       32
       32
       -
               /*noop*/

     

       33
       33
       -
             } else if (signal.tag === SignalKind.Push) {

     

       34
       34
       -
               values.push(signal[0]);

     

       35
       35
       -
             } else {

     

       36
       36
       -
               talkback = signal[0];

     

       37
       37
       -
             }

     

       38
       38
       -
           };

     

       39
       39
       -
       

     

       40
       40
       -
           operator(source)(sink);

     

       41
       41
       -
           // The Start signal should always come in immediately

     

       42
       42
       -
           expect(talkback).not.toBe(null);

     

       43
       43
       -
           // No Push signals should be issued initially

     

       44
       44
       -
           expect(values).toEqual([]);

     

       45
       45
       -
       

     

       46
       46
       -
           // When pulling a value we expect an immediate response

     

       47
       47
       -
           talkback!(TalkbackKind.Pull);

     

       48
       48
       -
           jest.runAllTimers();

     

       49
       49
       -
           expect(values).toEqual([output]);

     

       50
       50
       -
         });

     

       51
       51
       -
       };

     

       52
       52
       -
       

     

       53
       53
       -
       /* This tests a noop operator for regular, active Push signals.

     

       54
       54
       -
         A Push will be sent downwards from the source, through the

     

       55
       55
       -
         operator to the sink. Pull events should be let through from

     

       56
       56
       -
         the sink after every Push event. */

     

       57
       57
       -
       const passesActivePush = (operator: Operator<any, any>, result: any = 0) => {

     

       58
       58
       -
         it('responds to eager Push signals (spec)', () => {

     

       59
       59
       -
           const values: any[] = [];

     

       60
       60
       -
           let talkback: TalkbackFn | null = null;

     

       61
       61
       -
           let sink: Sink<any> | null = null;

     

       62
       62
       -
           let pulls = 0;

     

       63
       63
       -
       

     

       64
       64
       -
           const source: Source<any> = _sink => {

     

       65
       65
       -
             (sink = _sink)(

     

       66
       66
       -
               start(signal => {

     

       67
       67
       -
                 if (signal === TalkbackKind.Pull) pulls++;

     

       68
       68
       -
               })

     

       69
       69
       -
             );

     

       70
       70
       -
           };

     

       71
       71
       -
       

     

       72
       72
       -
           operator(source)(signal => {

     

       73
       73
       -
             expect(signal).not.toBe(SignalKind.End);

     

       74
       74
       -
             if (signal === SignalKind.End) {

     

       75
       75
       -
               /*noop*/

     

       76
       76
       -
             } else if (signal.tag === SignalKind.Start) {

     

       77
       77
       -
               talkback = signal[0];

     

       78
       78
       -
             } else if (signal.tag === SignalKind.Push) {

     

       79
       79
       -
               values.push(signal[0]);

     

       80
       80
       -
               talkback!(TalkbackKind.Pull);

     

       81
       81
       -
             }

     

       82
       82
       -
           });

     

       83
       83
       -
       

     

       84
       84
       -
           // No Pull signals should be issued initially

     

       85
       85
       -
           expect(pulls).toBe(0);

     

       86
       86
       -
       

     

       87
       87
       -
           // When pushing a value we expect an immediate response

     

       88
       88
       -
           sink!(push(0));

     

       89
       89
       -
           jest.runAllTimers();

     

       90
       90
       -
           expect(values).toEqual([result]);

     

       91
       91
       -
           // Subsequently the Pull signal should have travelled upwards

     

       92
       92
       -
           expect(pulls).toBe(1);

     

       93
       93
       -
         });

     

       94
       94
       -
       };

     

       95
       95
       -
       

     

       96
       96
       -
       /* This tests a noop operator for Close talkback signals from the sink.

     

       97
       97
       -
         A Close signal will be sent, which should be forwarded to the source,

     

       98
       98
       -
         which then ends the communication without sending an End signal. */

     

       99
       99
       -
       const passesSinkClose = (operator: Operator<any, any>) => {

     

       100
       100
       -
         it('responds to Close signals from sink (spec)', () => {

     

       101
       101
       -
           let talkback: TalkbackFn | null = null;

     

       102
       102
       -
           let closing = 0;

     

       103
       103
       -
       

     

       104
       104
       -
           const source: Source<any> = sink => {

     

       105
       105
       -
             sink(

     

       106
       106
       -
               start(signal => {

     

       107
       107
       -
                 if (signal === TalkbackKind.Pull && !closing) {

     

       108
       108
       -
                   sink(push(0));

     

       109
       109
       -
                 } else if (signal === TalkbackKind.Close) {

     

       110
       110
       -
                   closing++;

     

       111
       111
       -
                 }

     

       112
       112
       -
               })

     

       113
       113
       -
             );

     

       114
       114
       -
           };

     

       115
       115
       -
       

     

       116
       116
       -
           const sink: Sink<any> = signal => {

     

       117
       117
       -
             expect(signal).not.toBe(SignalKind.End);

     

       118
       118
       -
             if (signal === SignalKind.End) {

     

       119
       119
       -
               /*noop*/

     

       120
       120
       -
             } else if (signal.tag === SignalKind.Push) {

     

       121
       121
       -
               talkback!(TalkbackKind.Close);

     

       122
       122
       -
             } else {

     

       123
       123
       -
               talkback = signal[0];

     

       124
       124
       -
             }

     

       125
       125
       -
           };

     

       126
       126
       -
       

     

       127
       127
       -
           operator(source)(sink);

     

       128
       128
       -
       

     

       129
       129
       -
           // When pushing a value we expect an immediate close signal

     

       130
       130
       -
           talkback!(TalkbackKind.Pull);

     

       131
       131
       -
           jest.runAllTimers();

     

       132
       132
       -
           expect(closing).toBe(1);

     

       133
       133
       -
         });

     

       134
       134
       -
       };

     

       135
       135
       -
       

     

       136
       136
       -
       /* This tests a noop operator for End signals from the source.

     

       137
       137
       -
         A Push and End signal will be sent after the first Pull talkback

     

       138
       138
       -
         signal from the sink, which shouldn't lead to any extra Close or Pull

     

       139
       139
       -
         talkback signals. */

     

       140
       140
       -
       const passesSourceEnd = (operator: Operator<any, any>, result: any = 0) => {

     

       141
       141
       -
         it('passes on immediate Push then End signals from source (spec)', () => {

     

       142
       142
       -
           const signals: Signal<any>[] = [];

     

       143
       143
       -
           let talkback: TalkbackFn | null = null;

     

       144
       144
       -
           let pulls = 0;

     

       145
       145
       -
           let ending = 0;

     

       146
       146
       -
       

     

       147
       147
       -
           const source: Source<any> = sink => {

     

       148
       148
       -
             sink(

     

       149
       149
       -
               start(signal => {

     

       150
       150
       -
                 expect(signal).not.toBe(TalkbackKind.Close);

     

       151
       151
       -
                 if (signal === TalkbackKind.Pull) {

     

       152
       152
       -
                   pulls++;

     

       153
       153
       -
                   if (pulls === 1) {

     

       154
       154
       -
                     sink(push(0));

     

       155
       155
       -
                     sink(SignalKind.End);

     

       156
       156
       -
                   }

     

       157
       157
       -
                 }

     

       158
       158
       -
               })

     

       159
       159
       -
             );

     

       160
       160
       -
           };

     

       161
       161
       -
       

     

       162
       162
       -
           const sink: Sink<any> = signal => {

     

       163
       163
       -
             if (signal === SignalKind.End) {

     

       164
       164
       -
               signals.push(signal);

     

       165
       165
       -
               ending++;

     

       166
       166
       -
             } else if (signal.tag === SignalKind.Push) {

     

       167
       167
       -
               signals.push(signal);

     

       168
       168
       -
             } else {

     

       169
       169
       -
               talkback = signal[0];

     

       170
       170
       -
             }

     

       171
       171
       -
           };

     

       172
       172
       -
       

     

       173
       173
       -
           operator(source)(sink);

     

       174
       174
       -
       

     

       175
       175
       -
           // When pushing a value we expect an immediate Push then End signal

     

       176
       176
       -
           talkback!(TalkbackKind.Pull);

     

       177
       177
       -
           jest.runAllTimers();

     

       178
       178
       -
           expect(ending).toBe(1);

     

       179
       179
       -
           expect(signals).toEqual([push(result), SignalKind.End]);

     

       180
       180
       -
           // Also no additional pull event should be created by the operator

     

       181
       181
       -
           expect(pulls).toBe(1);

     

       182
       182
       -
         });

     

       183
       183
       -
       };

     

       184
       184
       -
       

     

       185
       185
       -
       /* This tests a noop operator for End signals from the source

     

       186
       186
       -
         after the first pull in response to another.

     

       187
       187
       -
         This is similar to passesSourceEnd but more well behaved since

     

       188
       188
       -
         mergeMap/switchMap/concatMap are eager operators. */

     

       189
       189
       -
       const passesSourcePushThenEnd = (operator: Operator<any, any>, result: any = 0) => {

     

       190
       190
       -
         it('passes on End signals from source (spec)', () => {

     

       191
       191
       -
           const signals: Signal<any>[] = [];

     

       192
       192
       -
           let talkback: TalkbackFn | null = null;

     

       193
       193
       -
           let pulls = 0;

     

       194
       194
       -
           let ending = 0;

     

       195
       195
       -
       

     

       196
       196
       -
           const source: Source<any> = sink => {

     

       197
       197
       -
             sink(

     

       198
       198
       -
               start(signal => {

     

       199
       199
       -
                 expect(signal).not.toBe(TalkbackKind.Close);

     

       200
       200
       -
                 if (signal === TalkbackKind.Pull) {

     

       201
       201
       -
                   pulls++;

     

       202
       202
       -
                   if (pulls <= 2) {

     

       203
       203
       -
                     sink(push(0));

     

       204
       204
       -
                   } else {

     

       205
       205
       -
                     sink(SignalKind.End);

     

       206
       206
       -
                   }

     

       207
       207
       -
                 }

     

       208
       208
       -
               })

     

       209
       209
       -
             );

     

       210
       210
       -
           };

     

       211
       211
       -
       

     

       212
       212
       -
           const sink: Sink<any> = signal => {

     

       213
       213
       -
             if (signal === SignalKind.End) {

     

       214
       214
       -
               signals.push(signal);

     

       215
       215
       -
               ending++;

     

       216
       216
       -
             } else if (signal.tag === SignalKind.Push) {

     

       217
       217
       -
               signals.push(signal);

     

       218
       218
       -
               talkback!(TalkbackKind.Pull);

     

       219
       219
       -
             } else {

     

       220
       220
       -
               talkback = signal[0];

     

       221
       221
       -
             }

     

       222
       222
       -
           };

     

       223
       223
       -
       

     

       224
       224
       -
           operator(source)(sink);

     

       225
       225
       -
       

     

       226
       226
       -
           // When pushing a value we expect an immediate Push then End signal

     

       227
       227
       -
           talkback!(TalkbackKind.Pull);

     

       228
       228
       -
           jest.runAllTimers();

     

       229
       229
       -
           expect(ending).toBe(1);

     

       230
       230
       -
           expect(pulls).toBe(3);

     

       231
       231
       -
           expect(signals).toEqual([push(result), push(result), SignalKind.End]);

     

       232
       232
       -
         });

     

       233
       233
       -
       };

     

       234
       234
       -
       

     

       235
       235
       -
       /* This tests a noop operator for Start signals from the source.

     

       236
       236
       -
         When the operator's sink is started by the source it'll receive

     

       237
       237
       -
         a Start event. As a response it should never send more than one

     

       238
       238
       -
         Start signals to the sink. */

     

       239
       239
       -
       const passesSingleStart = (operator: Operator<any, any>) => {

     

       240
       240
       -
         it('sends a single Start event to the incoming sink (spec)', () => {

     

       241
       241
       -
           let starts = 0;

     

       242
       242
       -
       

     

       243
       243
       -
           const source: Source<any> = sink => {

     

       244
       244
       -
             sink(start(() => {}));

     

       245
       245
       -
           };

     

       246
       246
       -
       

     

       247
       247
       -
           const sink: Sink<any> = signal => {

     

       248
       248
       -
             if (signal !== SignalKind.End && signal.tag === SignalKind.Start) {

     

       249
       249
       -
               starts++;

     

       250
       250
       -
             }

     

       251
       251
       -
           };

     

       252
       252
       -
       

     

       253
       253
       -
           // When starting the operator we expect a single start event on the sink

     

       254
       254
       -
           operator(source)(sink);

     

       255
       255
       -
           expect(starts).toBe(1);

     

       256
       256
       -
         });

     

       257
       257
       -
       };

     

       258
       258
       -
       

     

       259
       259
       -
       /* This tests a noop operator for silence after End signals from the source.

     

       260
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         When the operator receives the End signal it shouldn't forward any other

     

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         signals to the sink anymore.

     

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         This isn't a strict requirement, but some operators should ensure that

     

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       -
         all sources are well behaved. This is particularly true for operators

     

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       -
         that either Close sources themselves or may operate on multiple sources. */

     

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       -
       const passesStrictEnd = (operator: Operator<any, any>) => {

     

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         it('stops all signals after End has been received (spec: strict end)', () => {

     

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           let pulls = 0;

     

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           const signals: Signal<any>[] = [];

     

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       -
       

     

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           const source: Source<any> = sink => {

     

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             sink(

     

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       -
               start(signal => {

     

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       -
                 if (signal === TalkbackKind.Pull) {

     

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       -
                   pulls++;

     

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       275
       -
                   sink(SignalKind.End);

     

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                   sink(push(123));

     

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                 }

     

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       -
               })

     

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       -
             );

     

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       -
           };

     

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       -
       

     

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       -
           const sink: Sink<any> = signal => {

     

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       -
             if (signal === SignalKind.End) {

     

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       -
               signals.push(signal);

     

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       -
             } else if (signal.tag === SignalKind.Push) {

     

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       -
               signals.push(signal);

     

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       -
             } else {

     

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               signal[0](TalkbackKind.Pull);

     

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       -
             }

     

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       -
           };

     

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       -
       

     

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       -
           operator(source)(sink);

     

       293
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       -
       

     

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           // The Push signal should've been dropped

     

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           jest.runAllTimers();

     

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       -
           expect(signals).toEqual([SignalKind.End]);

     

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       -
           expect(pulls).toBe(1);

     

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       -
         });

     

       299
       299
       -
       

     

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       -
         it('stops all signals after Close has been received (spec: strict close)', () => {

     

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       -
           const signals: Signal<any>[] = [];

     

       302
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       -
       

     

       303
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       -
           const source: Source<any> = sink => {

     

       304
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       -
             sink(

     

       305
       305
       -
               start(signal => {

     

       306
       306
       -
                 if (signal === TalkbackKind.Close) {

     

       307
       307
       -
                   sink(push(123));

     

       308
       308
       -
                 }

     

       309
       309
       -
               })

     

       310
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       -
             );

     

       311
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       -
           };

     

       312
       312
       -
       

     

       313
       313
       -
           const sink: Sink<any> = signal => {

     

       314
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       -
             if (signal === SignalKind.End) {

     

       315
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       -
               signals.push(signal);

     

       316
       316
       -
             } else if (signal.tag === SignalKind.Push) {

     

       317
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       -
               signals.push(signal);

     

       318
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       -
             } else {

     

       319
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       -
               signal[0](TalkbackKind.Close);

     

       320
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       -
             }

     

       321
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       -
           };

     

       322
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       -
       

     

       323
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       -
           operator(source)(sink);

     

       324
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       -
       

     

       325
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       -
           // The Push signal should've been dropped

     

       326
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       -
           jest.runAllTimers();

     

       327
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       -
           expect(signals).toEqual([]);

     

       328
       328
       -
         });

     

       329
       329
       -
       };

     

       330
       330
       -
       

     

       331
       331
       -
       /* This tests an immediately closing operator for End signals to

     

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       332
       -
         the sink and Close signals to the source.

     

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       -
         When an operator closes immediately we expect to see a Close

     

       334
       334
       -
         signal at the source and an End signal to the sink, since the

     

       335
       335
       -
         closing operator is expected to end the entire chain. */

     

       336
       336
       -
       const passesCloseAndEnd = (closingOperator: Operator<any, any>) => {

     

       337
       337
       -
         it('closes the source and ends the sink correctly (spec: ending operator)', () => {

     

       338
       338
       -
           let closing = 0;

     

       339
       339
       -
           let ending = 0;

     

       340
       340
       -
       

     

       341
       341
       -
           const source: Source<any> = sink => {

     

       342
       342
       -
             sink(

     

       343
       343
       -
               start(signal => {

     

       344
       344
       -
                 // For some operator tests we do need to send a single value

     

       345
       345
       -
                 if (signal === TalkbackKind.Pull) {

     

       346
       346
       -
                   sink(push(null));

     

       347
       347
       -
                 } else {

     

       348
       348
       -
                   closing++;

     

       349
       349
       -
                 }

     

       350
       350
       -
               })

     

       351
       351
       -
             );

     

       352
       352
       -
           };

     

       353
       353
       -
       

     

       354
       354
       -
           const sink: Sink<any> = signal => {

     

       355
       355
       -
             if (signal === SignalKind.End) {

     

       356
       356
       -
               ending++;

     

       357
       357
       -
             } else if (signal.tag === SignalKind.Start) {

     

       358
       358
       -
               signal[0](TalkbackKind.Pull);

     

       359
       359
       -
             }

     

       360
       360
       -
           };

     

       361
       361
       -
       

     

       362
       362
       -
           // We expect the operator to immediately end and close

     

       363
       363
       -
           closingOperator(source)(sink);

     

       364
       364
       -
           expect(closing).toBe(1);

     

       365
       365
       -
           expect(ending).toBe(1);

     

       366
       366
       -
         });

     

       367
       367
       -
       };

     

       368
       368
       -
       

     

       369
       369
       -
       const passesAsyncSequence = (operator: Operator<any, any>, result: any = 0) => {

     

       370
       370
       -
         it('passes an async push with an async end (spec)', () => {

     

       371
       371
       -
           let hasPushed = false;

     

       372
       372
       -
           const signals: Signal<any>[] = [];

     

       373
       373
       -
       

     

       374
       374
       -
           const source: Source<any> = sink => {

     

       375
       375
       -
             sink(

     

       376
       376
       -
               start(signal => {

     

       377
       377
       -
                 if (signal === TalkbackKind.Pull && !hasPushed) {

     

       378
       378
       -
                   hasPushed = true;

     

       379
       379
       -
                   setTimeout(() => sink(push(0)), 10);

     

       380
       380
       -
                   setTimeout(() => sink(SignalKind.End), 20);

     

       381
       381
       -
                 }

     

       382
       382
       -
               })

     

       383
       383
       -
             );

     

       384
       384
       -
           };

     

       385
       385
       -
       

     

       386
       386
       -
           const sink: Sink<any> = signal => {

     

       387
       387
       -
             if (signal === SignalKind.End) {

     

       388
       388
       -
               signals.push(signal);

     

       389
       389
       -
             } else if (signal.tag === SignalKind.Push) {

     

       390
       390
       -
               signals.push(signal);

     

       391
       391
       -
             } else {

     

       392
       392
       -
               setTimeout(() => {

     

       393
       393
       -
                 signal[0](TalkbackKind.Pull);

     

       394
       394
       -
               }, 5);

     

       395
       395
       -
             }

     

       396
       396
       -
           };

     

       397
       397
       -
       

     

       398
       398
       -
           // We initially expect to see the push signal

     

       399
       399
       -
           // Afterwards after all timers all other signals come in

     

       400
       400
       -
           operator(source)(sink);

     

       401
       401
       -
           expect(signals.length).toBe(0);

     

       402
       402
       -
           jest.advanceTimersByTime(5);

     

       403
       403
       -
           expect(hasPushed).toBeTruthy();

     

       404
       404
       -
           jest.runAllTimers();

     

       405
       405
       -
       

     

       406
       406
       -
           expect(signals).toEqual([push(result), SignalKind.End]);

     

       407
       407
       -
         });

     

       408
       408
       -
       };

     

       409
       19
        
       

     

       410
       20
        
       beforeEach(() => {

     

       411
       21
        
         jest.useFakeTimers();