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What service tests check
Services typically hold business logic that components rely on. Testing them in isolation lets you verify that logic without rendering a component or involving its template. As Angular’s service-testing guide puts it, testing services checks that their logic works independently of components and templates.
A focused service test exercises the service’s public behavior: provide inputs, call its methods, and assert on returned values or other observable effects. The test should set up only the dependencies needed to verify that behavior.
Set up a service test with TestBed
TestBed creates an Angular testing environment and configures dependency injection. Use it to provide the service, then retrieve the instance the same way Angular resolves it. Angular’s guide demonstrates creating a fresh service instance in test setup.
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- Configure the testing module. Add the service to the providers for the test environment, along with any required dependencies.
- Retrieve the service. Use
TestBed.inject(YourService)to obtain the instance under test. - Exercise and assert. Call the service method with a representative input and check its result or effect.
For example, the essential setup has this shape:
beforeEach(() => {
TestBed.configureTestingModule({
providers: [YourService],
});
service = TestBed.inject(YourService);
});Adapt the providers to the service’s constructor dependencies and the test runner already configured in your project.
Test a service that depends on another service
When the behavior under test belongs to one service, substitute its collaborators rather than relying on their full implementations. Configure a stub value or spy as a provider for the dependency. Then assert both the subject service’s result and, when relevant, that it called the collaborator with the expected input. Angular’s service guide demonstrates this pattern with a spy.
This keeps the test focused: a failure is less likely to come from unrelated dependency behavior. It also makes interaction requirements explicit—for example, whether a dependency method should be called and what value it should receive.
Test HttpClient requests without network access
For a service that uses HttpClient, Angular’s HTTP testing utilities provide a test backend. A test can capture an outgoing request, assert its properties, and provide a mocked response. No real network request is needed.
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A typical HTTP-service test follows this sequence:
- Configure the test with the service and Angular’s HTTP testing providers.
- Call the service method that should issue the request.
- Use the HTTP testing controller to capture the expected request and check details such as its URL or method.
- Flush a test response through the captured request.
- Assert that the service handles the response as expected, and verify that no unexpected requests remain.
Use the current provider and controller setup shown in Angular’s HTTP testing guide; the exact project configuration can depend on the Angular version and whether the application uses standalone or module-based providers.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Choose a runner and execution environment that fit the project
Angular’s testing overview says new Angular CLI projects use Vitest with jsdom by default. That setup simulates a browser DOM in Node and is relevant for service logic that does not require execution in a real browser.
Tests that need actual browser behavior have other documented options: Angular’s overview lists browser providers including Playwright and WebdriverIO. Existing projects may still use Karma, which remains supported. Check your project’s Angular version and test configuration before adopting setup instructions or planning a migration. Run tests through the command configured for the project; Angular documents ng test for continuous integration as well.
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