···

       
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# Testers {#chap-testers}

     

       
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This chapter describes several testing builders which are available in the <literal>testers</literal> namespace.

     

       
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This chapter describes several testing builders which are available in the `testers` namespace.

     

       
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## `hasPkgConfigModule` {#tester-hasPkgConfigModule}

     

       
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* we can run `passthru.tests` independently

     

       
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* `installCheckPhase` adds overhead to each build

     

       
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For more on how to write and run package tests, see <xref linkend="sec-package-tests"/>.

     

       
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For more on how to write and run package tests, see [](#sec-package-tests).

     

       
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#### NixOS tests {#var-meta-tests-nixos}

     

       
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The installCheck phase checks whether the package was installed correctly by running its test suite against the installed directories. The default `installCheck` calls `make installcheck`.

     

       
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It is often better to add tests that are not part of the source distribution to `passthru.tests` (see <xref linkend="var-meta-tests"/>). This avoids adding overhead to every build and enables us to run them independently.

     

       
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It is often better to add tests that are not part of the source distribution to `passthru.tests` (see

     

       
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[](#var-meta-tests)). This avoids adding overhead to every build and enables us to run them independently.

     

       
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#### Variables controlling the installCheck phase {#variables-controlling-the-installcheck-phase}

     

       
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This setup hook patches installed scripts to add Nix store paths to their shebang interpreter as found in the build environment. The [shebang](https://en.wikipedia.org/wiki/Shebang_(Unix)) line tells a Unix-like operating system which interpreter to use to execute the script's contents.

     

       
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::: note

     

       
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::: {.note}

     

       
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The [generic builder][generic-builder] populates `PATH` from inputs of the derivation.

     

       
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:::

     

       
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Interpreter paths that point to a valid Nix store location are not changed.

     

       
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::: note

     

       
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::: {.note}

     

       
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A script file must be marked as executable, otherwise it will not be

     

       
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considered.

     

       
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:::