commit 7b5458b498732a3196c0482f67aa5b810e92448b · kitten.sh/use-interactions

+137

src/__tests__/usePriority.test.tsx

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       import React, { ReactNode, useState, useLayoutEffect, useRef } from 'react';

     

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       import { mount } from '@cypress/react';

     

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       import { makePriorityHook } from '../usePriority';

     

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       const usePriority = makePriorityHook();

     

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       const FocusOnPriority = (

     

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         { id, children = null }:

     

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         { id: string, children?: ReactNode }

     

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       ) => {

     

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         const ref = useRef<HTMLDivElement>(null);

     

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         const hasPriority = usePriority(ref);

     

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         useLayoutEffect(() => {

     

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           if (hasPriority && ref.current) {

     

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             ref.current!.focus();

     

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           }

     

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         }, [hasPriority, ref]);

     

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         return (

     

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           <div tabIndex={-1} ref={ref} id={id}>

     

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             {children}

     

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           </div>

     

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         );

     

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       };

     

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       it('allows sole element to take priority', () => {

     

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         mount(

     

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           <FocusOnPriority id="only" />

     

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         );

     

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         cy.focused().should('have.id', 'only');

     

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       });

     

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       it('tracks priority of sibling elements in order', () => {

     

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         mount(

     

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           <main>

     

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             <FocusOnPriority id="first" />

     

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             <FocusOnPriority id="second" />

     

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           </main>

     

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         );

     

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         cy.focused().should('have.id', 'second');

     

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       });

     

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       it('tracks priority of nested elements in order', () => {

     

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         mount(

     

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           <FocusOnPriority id="outer">

     

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             <FocusOnPriority id="inner" />

     

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           </FocusOnPriority>

     

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         );

     

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         cy.focused().should('have.id', 'inner');

     

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       });

     

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       it('should switch priorities of sibling elements as needed', () => {

     

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         const App = () => {

     

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           const [visible, setVisible] = useState(true);

     

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           return (

     

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             <main>

     

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               <FocusOnPriority id="first" />

     

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               {visible && <FocusOnPriority id="second" />}

     

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               <button onClick={() => setVisible(false)}>switch</button>

     

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             </main>

     

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           );

     

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         };

     

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         mount(<App />);

     

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         cy.focused().should('have.id', 'second');

     

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         cy.get('button').first().click();

     

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         cy.focused().should('have.id', 'first');

     

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       });

     

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       it('should switch priorities of nested elements as needed', () => {

     

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         const App = () => {

     

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           const [visible, setVisible] = useState(true);

     

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           return (

     

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             <main>

     

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               <FocusOnPriority id="outer">

     

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                 {visible && <FocusOnPriority id="inner" />}

     

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               </FocusOnPriority>

     

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               <button onClick={() => setVisible(false)}>switch</button>

     

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             </main>

     

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           );

     

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         };

     

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         mount(<App />);

     

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         cy.focused().should('have.id', 'inner');

     

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         cy.get('button').first().click();

     

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         cy.focused().should('have.id', 'outer');

     

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       });

     

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       it('should preserve priorities when non-prioritised item is removed', () => {

     

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         const App = () => {

     

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           const [visible, setVisible] = useState(true);

     

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           return (

     

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             <main>

     

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               {visible && <FocusOnPriority id="first" />}

     

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               <FocusOnPriority id="second" />

     

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               <button onClick={() => setVisible(false)}>switch</button>

     

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             </main>

     

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           );

     

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         };

     

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         mount(<App />);

     

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         cy.focused().should('have.id', 'second');

     

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         cy.get('button').first().click();

     

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         cy.get('button').first().should('have.focus');

     

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       });

     

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       it('should update priorities when new prioritised item is added', () => {

     

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         const App = () => {

     

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           const [visible, setVisible] = useState(false);

     

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           return (

     

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             <main>

     

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               <FocusOnPriority id="first" />

     

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               <FocusOnPriority id="second" />

     

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               {visible && <FocusOnPriority id="third" />}

     

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               <button onClick={() => setVisible(true)}>switch</button>

     

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             </main>

     

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           );

     

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         };

     

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         mount(<App />);

     

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         cy.focused().should('have.id', 'second');

     

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         cy.get('button').first().click();

     

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         cy.focused().should('have.id', 'third');

     

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       });