Are there any means to automatically generate placeholder methods and properties for constructor dependencies in Angular?

constructor(private a:dependencyA,private  b:dependencyB,private  c:dependencyC){

}

Here is an example of how dependencyA is structured:

export class dependencyA {
  showPopup: boolean;
  defaultProperties = {
    showPopup: this.showPopup,
  };
  private propertiesSource = new BehaviorSubject(this.defaultProperties);
  currentProperties = this.propertiesSource.asObservable();
}

When unit testing, I find myself manually creating stubs for each constructor dependency with mock data or methods. For instance:

class dependencyAStub{
  defaultProperties = {
    showPopup: false,
  };
  private propertiesSource = new BehaviorSubject(this.defaultProperties);
  currentProperties = this.propertiesSource.asObservable();
  push(value){
    this.propertiesSource.next(value);
  }
}

and,

 TestBed.configureTestingModule({
      declarations: [ ComponentDetailsComponent ],
       providers: [{ provide: dependencyA, useClass: dependencyAStub }],
providers: [{ provide: dependencyB, useClass: dependencyBStub }],
providers: [{ provide: dependencyC, useClass: dependencyCStub }],
    })

I hope there's a more efficient way to create mock stubs for all dependencies. With multiple dependencies in the component's constructor, and each having several functions and properties, it becomes time-consuming to manually generate stubs for each one. It would be beneficial if there was an automated process for generating stubs, while still allowing for manual specification of specific values for certain dependencies during testing.

Answer №1

If you're looking to streamline your mocking processes, give Jasmine-Mock-Factory a shot! Find out more at https://www.npmjs.com/package/jasmine-mock-factory

With this tool, you'll be able to skip creating stubs for standalone dependencies. Plus, the library comes equipped with helpful documentation to help you hit the ground running.

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