71 lines
2.0 KiB
Markdown
71 lines
2.0 KiB
Markdown
# Step 11: Test Affected Projects
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## Video of this Lesson
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<iframe width="560" height="600" src="https://www.youtube.com/embed/5t77CPl-bbM" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
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Because Nx understands the dependency graph of your workspace, Nx can be efficient at retesting and rebuilding your projects.
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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/ui/src/lib/todos/todos.component.html` and change the template:**
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```html
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<ul>
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<li *ngFor="let t of todos">{{ t.title }}!</li>
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</ul>
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```
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**Run `npm run affected:apps`**, and you should see `todos` printed out. The `affected:apps` looks at what you have changed and uses the dependency graph to figure out which apps can be affected by this change.
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**Run `npm run affected:libs`**, and you should see `ui` 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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You will see the following:
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```bash
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> NX Running target test for projects:
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- ui
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- todos
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...
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Failed projects:
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- todos
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- ui
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```
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Note that Nx only tried to retest `ui` and `todos`. It didn't retest `api` or `data` because there is no way that could be affected by the changes in this branch.
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**Run `npm run affected:test -- --only-failed` to retest the failed projects.**
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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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!!!!!
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Run "nx affected --target=invalid --base=master". What do you see?
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!!!!!
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No projects to run test
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The `todos` project failed as before
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`Cannot run tests against master` error
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