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`require all src files` in unit/index.js useless? #928

njleonzhang opened this Issue Sep 18, 2017 · 2 comments


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njleonzhang commented Sep 18, 2017

Hi team,

Does the following code really useful? I remove the code from my project, but nothing change, it seems not impact the code coverage as the comments stated.

// require all src files except main.js for coverage.
// you can also change this to match only the subset of files that
// you want coverage for.
const srcContext = require.context('../../src', true, /^\.\/(?!main(\.js)?$)/){{#if_eq lintConfig "airbnb"}};{{/if_eq}}
srcContext.keys().forEach(srcContext){{#if_eq lintConfig "airbnb"}};{{/if_eq}}

According to karma-webpack doc, I can not find the purpose of these code too. If they are useful would you please give some explanation?


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LinusBorg commented Sep 25, 2017

If you reference all source files from your tests anyway, then this has indeed no effect.

If however you tests leave out some source files, then this code would make sure they are still required and therefore taken into account when calculating coverage.

If that doesn't work as expected for you, maybe there's a bug?


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njleonzhang commented Sep 25, 2017

@LinusBorg Tnx for explanation. I understand now. No bug exists.
In my project, I split template code to a independent pug file (for some reason). when run release/dev, no error occurs. But if I run npm run test, the pug file is loaded by above code, which need a pug-loader, error occurs. So I start to look into this test/index.js, and thinking why we need these lines. Now you provide me a explanation, I understand. tnx again.

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