60 lines
1.8 KiB
Markdown
60 lines
1.8 KiB
Markdown
# Step 10: Test Affected Projects
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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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```
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**Open `libs/ui/src/lib/todos/todos.tsx` and change the component:**
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```typescript jsx
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{
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props.todos.map(t => <li className={'todo'}>{t.title} !!</li>);
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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 dependency graph to figure out which apps can be affected by this change.
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**Run `nx 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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```
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Running test for projects:
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ui,
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todos
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...
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Running test for affected projects failed.
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Failed projects: todos
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You can isolate the above projects by passing --only-failed
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```
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One of the projects failed. Instead of retesting every single project on every change, pass `--only-failed` to only retest the failed ones.
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**Run `nx affected:test --only-failed` to retest the failed projects.**
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## Testing in Parallel
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Some changes affect many projects in the repository. To speed up the testing of this change, pass `--parallel`.
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**Run `nx affected:test --parallel` to test affected projects in parallel**
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!!!!!
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Check in the changes into master and run `nx affected:test`. 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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