78 lines
2.3 KiB
Markdown
78 lines
2.3 KiB
Markdown
# Node Nx Tutorial - Step 7: Test Affected Projects
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<iframe loading="lazy" width="560" height="315" src="https://www.youtube.com/embed/TRRVLyHfN60" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture; fullscreen"></iframe>
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In addition to supporting computation caching, Nx scales your development by doing code change analysis to see what apps or libraries are affected by a particular pull request.
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**Commit all the changes in the repo**:
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```bash
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git add .
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git commit -am 'init'
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git checkout -b testbranch
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```
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**Open `libs/auth/src/lib/auth.controller.ts` and change the controller:**
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```typescript
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import { Body, Controller, Get, Post } from '@nestjs/common';
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@Controller('auth')
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export class AuthController {
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@Get()
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auth() {
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return {
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authenticated: true,
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};
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}
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@Post()
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authenticate(@Body() postData: { username: string; password: string }) {
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const { username, password } = postData;
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// check the database
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console.log(username, password);
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}
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}
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```
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**Run `nx affected:apps`**, and you should see `todos` printed out. The `affected:apps` looks at what you have changed and uses the project graph to figure out which apps are affected by this change.
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**Run `nx affected:libs`**, and you should see `auth` printed out. This command works similarly, but instead of printing the affected apps, it prints the affected libs.
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## Test Affected Projects
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Printing the affected projects can be handy, but usually you want to do something with them. For instance, you may want to test everything that has been affected.
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**Run `nx affected:test` to retest only the projects affected by the change.**
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As you can see, because the code was updated without updating the tests, the unit tests failed.
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```bash
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> NX Running target test for projects:
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- auth
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- todos
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...
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Failed projects:
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- todos
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```
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Note that Nx only tried to retest `auth` and `todos`. It didn't retest `data` because there is no way that library could be affected by the changes in this branch.
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## Affected:\*
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You can run any target against the affected projects in the graph like this:
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```bash
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# The following are equivalent
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nx affected --target=build
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nx affected:build
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```
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## What's Next
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- Continue to [Step 8: Summary](/node-tutorial/08-summary)
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