Mixing isolated and non-isolated tests in Karma and Angular 2 can lead to runtime injection failures

New to Angular 2 and trying to create a model for an Angular 2 app that is a migration from Java to TypeScript. The tests we are recreating are "isolated" tests as specified in the testing guide.

Encountered Issue:

After adding an isolated test, all Angular 2 tests fail with similar errors in Karma:

Chrome 59.0.3071 (Windows 10 0.0.0) Home should have a title FAILED
    Failed: Unexpected value 'HomeComponent' declared by the module 'DynamicTestModule'. Please add a @Pipe/@Directive/@Component annotation.
    Error: Unexpected value 'HomeComponent' declared by the module 'DynamicTestModule'. Please add a @Pipe/@Directive/@Component annotation.
        at syntaxError ......
...snip...

The error logs can be found in the GitHub repository: https://github.com/Nava2/angular-starter/tree/master/src/app. The complete log output is available in this gist: this gist.

WebStorm tree structure can be viewed here: https://i.sstatic.net/e1O2p.png

Removing the isolated test resolves the Angular 2 test errors.

Steps to Reproduce:

  1. Clone this fork: https://github.com/Nava2/angular-starter
  2. Run npm install
  3. Run npm run test

If I remove app/model/entity.no-testbed.spec.ts, the errors go away. Unsure why they occur. Seeking guidance on the correct development approach to avoid wasting time.

Misc Information

  • Operating System: Windows 10
  • Node Version: v8.1.2

Answer №1

If you could provide the source code for your spec file, it would be beneficial in solving the issue at hand. It seems like you may have forgotten to import the HomeComponent.

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