Dealing with Angular Unit Tests can be a hassle: they don't uncover issues until it's too late in the build or compile

Question

Dealing with Angular Unit Tests can be a hassle: they don't uncover issues until it's too late in the build or compile

It seems like every time I write tests for Angular, they fail at runtime instead of build time. Issues like 'No Provider found', 'Null', and 'etc NULL' keep popping up, and I end up constantly searching on Google for solutions. This is why React has gained the top market share now. Is there a way to catch all these issues at build compile time instead of dealing with them at runtime?

After googling to fix one issue, I now have 10 more. Is there a more efficient solution to resolving these without getting stuck in a loop?

NullInjectorError: R3InjectorError(DynamicTestModule)[InjectionToken MatDialogData -> InjectionToken MatDialogData]: 
  NullInjectorError: No provider for InjectionToken MatDialogData!

angular typescript karma-jasmine angular10

Answer 1

Answer №1

As you develop your tests, it's important to include all the necessary services that are passed into your constructor. The test environment needs these providers in order to effectively bootstrap and construct your component, service, or directive.

Within your beforeEach(() => {}) block, you must include the providers and imports required, along with their default methods and variables. One helpful tool for this task is ng-mocks, which generates mock services or providers for you.

Here's a sample setup:

beforeEach(() =>
    TestBed.configureTestingModule({
        imports: [HttpClientTestingModule, RouterTestingModule],
        providers: [MockProvider(MyTestService)],
    }),
);

Answer 2

As you develop your tests, it's important to include all the necessary services that are passed into your constructor. The test environment needs these providers in order to effectively bootstrap and construct your component, service, or directive.

Within your beforeEach(() => {}) block, you must include the providers and imports required, along with their default methods and variables. One helpful tool for this task is ng-mocks, which generates mock services or providers for you.

Here's a sample setup:

beforeEach(() =>
    TestBed.configureTestingModule({
        imports: [HttpClientTestingModule, RouterTestingModule],
        providers: [MockProvider(MyTestService)],
    }),
);

Dealing with Angular Unit Tests can be a hassle: they don't uncover issues until it's too late in the build or compile

Answer №1

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