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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →To test an Angular app with Jasmine and Karma, configure the project’s Angular CLI test target to use Karma, write Jasmine specs, and run them with ng test. This workflow remains supported and is especially relevant to existing projects. New Angular CLI projects currently default to Vitest, so check your project’s test target before following the Karma setup steps.
What Jasmine and Karma each do
Jasmine is the test framework: it provides describe and it for organizing tests, expect for assertions, and spies for observing or replacing function calls. Karma is the runner that launches tests in a browser. Angular’s testing utilities, including TestBed and ComponentFixture, provide the Angular-specific environment for configuring dependencies and checking component behavior.
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Angular documents Karma as supported alongside its newer default, Vitest. See the Angular testing overview and Karma and Jasmine guide. Which setup applies depends on your Angular CLI version and the test target in angular.json.
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Starting a new project with Karma
Ask Angular CLI to configure Karma when creating the project:
ng new my-karma-app --test-runner=karmaThis explicitly selects Karma rather than relying on the current new-project default, which is Vitest.
Using an existing project
Inspect angular.json and find the application’s test target. Angular’s documented setup uses the @angular/build:unit-test builder with "runner": "karma". A simplified target looks like this; preserve the rest of your project’s existing options and configuration:
{
"projects": {
"my-app": {
"architect": {
"test": {
"builder": "@angular/build:unit-test",
"options": {
"runner": "karma"
}
}
}
}
}
}Builder names and supported options can vary with Angular CLI generation. Check the Angular Karma guide for your version before copying configuration verbatim.
Install the Karma and Jasmine packages
For an existing project that does not already include them, Angular’s guide lists these package families: karma, karma-chrome-launcher, karma-coverage, karma-jasmine, karma-jasmine-html-reporter, jasmine-core, and @types/jasmine. Install the corresponding packages using your project’s package manager and version conventions, checking compatibility with the Angular version in use. Angular CLI can construct the Karma/Jasmine configuration from test-target options, so not every project needs a manually maintained Karma config file.
Enable Jasmine types in TypeScript
If TypeScript does not recognize the global Jasmine functions, include jasmine in compilerOptions.types in tsconfig.spec.json:
{
"compilerOptions": {
"types": ["jasmine"]
}
}If the file already has a types array, add jasmine without removing its other entries.
Write a service test
For Angular services, configure the testing environment and retrieve dependencies through the test injector. This example tests a service’s returned value; replace the service and expected value with the behavior in your application.
import { TestBed } from '@angular/core/testing';
import { GreetingService } from './greeting.service';
describe('GreetingService', () => {
beforeEach(() => {
TestBed.configureTestingModule({
providers: [GreetingService]
});
});
it('returns a greeting', () => {
const service = TestBed.inject(GreetingService);
expect(service.greet('Ada')).toBe('Hello, Ada');
});
});Jasmine defines the suite, test, and assertion. TestBed configures Angular’s testing injector and resolves the service. Keep each test focused on observable behavior rather than implementation details.
Test a component and its rendered behavior
Use TestBed to provide a component’s imports and dependencies, then call TestBed.createComponent to get a ComponentFixture. The fixture exposes both the component instance and its rendered view. Call detectChanges() when you want Angular to update the view before making assertions.
import { ComponentFixture, TestBed } from '@angular/core/testing';
import { GreetingComponent } from './greeting.component';
describe('GreetingComponent', () => {
let fixture: ComponentFixture<GreetingComponent>;
beforeEach(async () => {
await TestBed.configureTestingModule({
imports: [GreetingComponent]
}).compileComponents();
fixture = TestBed.createComponent(GreetingComponent);
fixture.detectChanges();
});
it('renders its initial greeting', () => {
const text = fixture.nativeElement.querySelector('h1').textContent;
expect(text).toContain('Hello');
});
});This example assumes GreetingComponent is standalone. For a component declared in an NgModule, configure the relevant module or declare the component as appropriate for that application. Include the component’s required imports and providers in the test configuration.
Check an input or dependency change
Set an input on the component instance, trigger change detection, and assert the rendered result. Adapt the input name and expected text to the component:
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it('renders the supplied name', () => {
fixture.componentInstance.name = 'Ada';
fixture.detectChanges();
const text = fixture.nativeElement.querySelector('h1').textContent;
expect(text).toContain('Ada');
});When testing a service-backed component, provide a test double in the testing configuration, then assert the user-visible outcome. This keeps the test independent of network access or unrelated service implementation.
Check a user interaction
Trigger the same DOM event the component responds to, then run change detection and verify the result. For a button with an Angular click handler:
it('updates the view after a click', () => {
const button: HTMLButtonElement = fixture.nativeElement.querySelector('button');
button.click();
fixture.detectChanges();
expect(fixture.nativeElement.textContent).toContain('Saved');
});Use assertions that reflect the outcome a user can observe. If the interaction schedules asynchronous work, wait for that work using an explicit async pattern before checking the updated view.
Test asynchronous behavior deliberately
For native promises, make the Jasmine test function async and await the operation before asserting. For Angular work that must settle before reading the view, use the fixture’s stability mechanism where it fits:
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it('renders after asynchronous work settles', async () => {
await fixture.whenStable();
fixture.detectChanges();
expect(fixture.nativeElement.textContent).toContain('Loaded');
});Choose an approach that matches the operation under test. Angular’s testing APIs are distinct from Jasmine’s runner conventions; legacy Zone.js helpers should not be treated as universal Jasmine/Karma features.
Run tests and debug failures
Run in watch mode
From the Angular workspace, run:
ng testIn the documented Karma workflow, this builds and launches the configured runner in watch mode; changes trigger another test run. The behavior depends on the project’s test target and CLI version.
Run a headless, single CI pass
Angular’s Karma guide documents this CI-style command:
ng test --no-watch --no-progress --browsers=ChromeHeadlessIt disables watch mode and progress output and selects the Chrome headless browser launcher. Make sure the project has a compatible browser launcher and that Chrome is available in the CI environment. Exact option support can depend on the Angular CLI version and configured runner.
Debug in a browser
When a test fails in the browser, use Karma’s browser window and its DEBUG tab to run the tests in a debuggable context. Open the browser’s developer tools, set breakpoints in the relevant spec or application code, and inspect the state when the test pauses. For custom Karma configuration, Angular documents generating a configuration file with:
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ng generate config karmaGenerate one only when you need settings beyond the CLI’s test-target options.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshoot common setup problems
describe,it, orexpectis unknown to TypeScript: check that the spec TypeScript configuration includes"jasmine"incompilerOptions.types, and that@types/jasmineis installed.ng testruns Vitest instead of Karma: inspect the application’stesttarget inangular.json. Configure the supported test builder and set its runner tokarmaas documented for your Angular CLI version.- The browser does not launch in CI: verify that the configured browser launcher is installed and that the selected browser is available to the CI job. Angular’s documented headless example selects
ChromeHeadless; it does not install Chrome for you. - A component test reports missing dependencies or imports: add the component’s required imports and providers to
TestBed.configureTestingModule, or provide an appropriate test double for dependencies not under test. - The DOM assertion sees stale content: after changing component state or dispatching an event, call
fixture.detectChanges()before reading the rendered view. If asynchronous work is involved, await its completion or fixture stability first. - A custom Karma configuration no longer matches the CLI setup: compare the configuration with the project’s test target and Angular CLI version. Generate a Karma config only for settings the CLI options do not cover.
When to keep Karma and when to consider Vitest
For an established project, retaining Karma can avoid reworking existing Jasmine specs, custom browser launchers, reporters, plugins, and test-specific configuration. It also preserves browser-based execution where that is part of the team’s testing needs. Review the project’s current Angular CLI support and actual test target rather than assuming every Angular project uses the same runner.
For a new project, Angular CLI currently defaults to Vitest with jsdom. Angular’s migration guide describes moving from Karma and Jasmine to Vitest as experimental, requiring the application build system, and potentially requiring manual review. Migration can involve installing Vitest and a DOM emulator, changing the test builder, reviewing old target build options, and replacing or moving custom Karma configuration. The refactoring schematic converts some common Jasmine patterns but does not handle every complex case; Angular advises reviewing its changes. Browser mode is also available through providers such as Playwright or WebdriverIO. Migration is an option, not a requirement for existing projects. See the Angular Vitest migration guide.
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Frequently Asked Questions
Does Jasmine provide Angular’s component-testing utilities?
No. Jasmine supplies test structure, assertions, and spies; Angular’s TestBed and ComponentFixture provide the Angular testing environment.
Do I need to create a karma.conf.js file?
Not necessarily. Angular CLI can build Karma configuration from test-target options; generate a Karma config only when you need custom settings.
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