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Part 5c: Update test coverage instructions for Vitest 4 #4315

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Part 5c: Update test coverage instructions for Vitest 4 #4315

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6c1cfc9
Update test coverage config for Vitest 4
drmbilalkhalid Aug 11, 2026
eeaacc7
Potential fix for pull request finding
mluukkai Aug 22, 2026
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14 changes: 14 additions & 0 deletions src/content/5/en/part5c.md
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Expand Up @@ -806,6 +806,20 @@ The first time you run the command, Vitest will ask you if you want to install t

![terminal output of test coverage](../../images/5/18new.png)

With Vitest 4, only files covered by tests are included in the coverage
report by default. To also include uncovered source files, add the following
to the _test_ configuration in _vite.config.js_:

```js
export default defineConfig({
// ...
test: {
// ...
coverage: { include: ['src/**/*.{js,jsx}'] },
},
})
```

A HTML report will be generated to the <i>coverage</i> directory.
The report will tell us the lines of untested code in each component:

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