Tests fail on dependency injection after upgrading to Angular 9

Describe the Bug

Tests fail on components and services (and probably other things I have not yet tested) which have dependencies (in the constructor) after upgrading to Angular 9, with the following error: TypeError: Cannot read property 'ɵprov' of undefined

Minimal Reproduction

• create a project with the latest CLI version (currently 9.0.1)

• setup the project following the guidelines from https://medium.com/angular-in-depth/angular-cli-ng-test-with-jest-in-3-minutes-v2-1060ddd7908d

• create a service using the CLI

• add a dependency to the service’s constructor (for instance HttpClient)

• run ng test

• test fails with the following error: TypeError: Cannot read property 'ɵprov' of undefined

Adding HttpClientTestingModule to TestBed imports makes no difference.

Minimal reproduction repo: https://github.com/bisonfoutu/jest-ng-9-issue

Expected Behavior

A clear and concise description of what you expected to happen.

Screenshots

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Environment

Libs
- @angular/core version: 9.0.0
- @angular-devkit/build-angular version: 0.900.1
- @angular-builders/jest version: 9.0.0-beta.3

For Tooling issues:
- Node version: 12.14.0  
- Platform: Windows 

Others:

Additional Context

Add any other context about the problem here.

[just-jeb]

Yes, I cloned, indeed there was a problem.
You need to set "emitDecoratorMetadata": true in compilerOptions of your tsconfig.spec.json. Once you do this it starts working. More details here. I’ll update the article.

[michaelfaith]

I’m seeing this error as well, on tests for anything that has dependencies. And i do have emitDecoratorMetadata set to true. I didn’t at first, but then found this issue, and added it. But, it still has the same behavior.

I just realized this happens on any Angular element having dependencies, I updated the title and bug description accordingly.

The test still does not pass, but it returns a different error:

This can happen if the dependency type is a primitive like a string or if an ancestor of this class is missing an Angular decorator.

Please check that 1) the type for the parameter at index 0 is correct and 2) the correct Angular decorators are defined for this class and its ancestors.```