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Better documentation for setupTests.js when ejecting (#3656)

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* Better documentation for setupTests.js when ejecting

When running `npm run eject` before creating `src/setupTests.js`, the resulting `package.json` file, won't contain any entry for it - and this is correct in my opinion, since otherwise Jest will crash - but it's useful to have it documented and avoid pointless waste of time.

* Added additional note about src/setupTests.js

Added another note about src/setupTests.js and `npm run eject` in Testing Components section

* Update README.md

* Update README.md
This commit is contained in:
Danny Calleri
2018-01-09 16:25:59 +01:00
committed by Dan Abramov
parent 344ddfa30e
commit 5a0b1ef56d
1 changed files with 9 additions and 2 deletions
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packages/react-scripts/template/README.md
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@@ -1334,7 +1334,7 @@ import Adapter from 'enzyme-adapter-react-16';
configure({ adapter: new Adapter() });
```
(Note that **if you already ejected** before creating `src/setupTests.js`, this won’t work unless you set [this Jest option](https://facebook.github.io/jest/docs/en/configuration.html#setuptestframeworkscriptfile-string) to point to `src/setupTests.js`.)
>Note: Keep in mind that if you decide to "eject" before creating `src/setupTests.js`, the resulting `package.json` file won't contain any reference to it. [Read here](#initializing-test-environment) to learn how to add this after ejecting.
Now you can write a smoke test with it:
@@ -1425,7 +1425,14 @@ const localStorageMock = {
global.localStorage = localStorageMock
```
Note that **if you already ejected** before creating `src/setupTests.js`, this won’t work unless you set [this Jest option](https://facebook.github.io/jest/docs/en/configuration.html#setuptestframeworkscriptfile-string) to point to `src/setupTests.js`.
>Note: Keep in mind that if you decide to "eject" before creating `src/setupTests.js`, the resulting `package.json` file won't contain any reference to it, so you should manually create the property `setupTestFrameworkScriptFile` in the configuration for Jest, something like the following:
>```js
>"jest": {
> // ...
> "setupTestFrameworkScriptFile": "<rootDir>/src/setupTests.js"
> }
> ```
### Focusing and Excluding Tests