The Tool Desk
Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →For a new Angular CLI project, start with ng test: current Angular documentation describes Vitest as the default runner, with jsdom providing a browser-like DOM in Node.js. For most unit tests, this is the quicker path; use browser mode when real-browser APIs, rendering behavior, or browser debugging matter. Existing Karma projects remain supported, and Angular describes migration to Vitest as experimental.
Run Angular tests with the default setup
New Angular CLI projects are documented as ready to test with Vitest and jsdom. Vitest runs in Node.js; jsdom emulates the browser DOM so tests can exercise many component and application behaviors without launching a browser. Angular also names happy-dom as a supported alternative.
- Open a terminal at the Angular workspace root, where
angular.jsonis located. - Run
ng test. - In interactive use, the test target watches for file changes. In CI, set
CI=truefor non-interactive single-run behavior. If the CI environment does not set that variable, Angular documentsng test --no-watch --no-progress.
The test target can be configured in angular.json. Documented configuration areas include file patterns to include or exclude, setup files, provider files, coverage, browser selection, and a custom runner configuration. Angular handles most Vitest configuration. Treat a custom runner config as an advanced option: Angular does not support the contents of custom configuration files or third-party plugins.
Choose the test environment
| Environment | Useful for | Trade-off |
|---|---|---|
| Node.js with jsdom or happy-dom | Ordinary unit tests and fast feedback without launching a browser. | A DOM emulator is not a real browser; browser-specific APIs and rendering may not behave identically. |
| Browser mode | Tests that depend on browser-specific APIs, rendering behavior, or debugging in a browser. | Requires installing a browser provider and selecting browser settings; it adds setup compared with the default Node-based route. |
Angular documents Playwright and WebdriverIO providers for browser testing. Install the provider you choose and configure the test target’s browsers option. In CI, headless mode is used automatically when the CI environment variable is set; a browser name can also explicitly select headless mode. Choose browser mode for a concrete fidelity or debugging need rather than assuming it is always better.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
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- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
Test services with TestBed
TestBed creates an isolated Angular testing environment, configures dependency injection, and lets a test retrieve a service instance. Unless the test provides alternatives, dependencies are real, so the test can exercise the application’s actual service path.
import { TestBed } from '@angular/core/testing';
import { PriceService } from './price.service';
describe('PriceService', () => {
let service: PriceService;
beforeEach(() => {
TestBed.configureTestingModule({});
service = TestBed.inject(PriceService);
});
it('creates the service', () => {
expect(service).toBeTruthy();
});
});Replace PriceService with the service under test. Add providers or test doubles in the testing module when the test should isolate the service from a dependency; otherwise, TestBed uses the configured dependency injection graph.
Test component behavior and rendered output
A component combines a TypeScript class and an HTML template. TestBed can configure and create that combination. A fixture gives the test access to the component instance and rendered view; Angular’s DebugElement provides a platform-aware way to inspect elements and bindings.
Rank #2
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- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
import { TestBed } from '@angular/core/testing';
import { GreetingComponent } from './greeting.component';
describe('GreetingComponent', () => {
it('renders the greeting', async () => {
await TestBed.configureTestingModule({
imports: [GreetingComponent],
}).compileComponents();
const fixture = TestBed.createComponent(GreetingComponent);
fixture.detectChanges();
expect(fixture.nativeElement.textContent).toContain('Hello');
});
});This example assumes GreetingComponent is standalone. For a non-standalone component, configure its declaring module or declaration as appropriate for the application. Direct nativeElement access assumes the active DOM implementation exposes the APIs the test uses. Prefer Angular’s DebugElement abstraction when portability across rendering environments matters.
Test HTTP behavior without a real backend
Angular’s @angular/common/http/testing utilities replace real network calls with a test backend. A test can make a request, inspect its URL or method, and flush a controlled response. The test must flush expected requests and verify that no unexpected requests remain.
import { provideHttpClient } from '@angular/common/http';
import {
HttpTestingController,
provideHttpClientTesting,
} from '@angular/common/http/testing';
import { TestBed } from '@angular/core/testing';
import { DataService } from './data.service';
describe('DataService', () => {
let service: DataService;
let http: HttpTestingController;
beforeEach(() => {
TestBed.configureTestingModule({
providers: [
provideHttpClient(),
provideHttpClientTesting(),
DataService,
],
});
service = TestBed.inject(DataService);
http = TestBed.inject(HttpTestingController);
});
afterEach(() => http.verify());
it('loads data from the API', () => {
let result: unknown;
service.load().subscribe(value => (result = value));
const request = http.expectOne('/api/data');
expect(request.request.method).toBe('GET');
request.flush({ ok: true });
expect(result).toEqual({ ok: true });
});
});Adapt the service method and expected endpoint to your code. The important test sequence is to trigger the application call, capture and assert the outgoing request, flush a controlled response, and verify outstanding requests.
Rank #3
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- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Measure coverage
For Vitest coverage, install @vitest/coverage-v8, then run:
ng test --coverageAngular documents the generated report in the coverage/ directory. Coverage shows which code the tests exercise; a high percentage alone does not establish that assertions check the right behavior.
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Decide whether to keep Karma or migrate
Karma remains supported, and Angular documents Karma with Jasmine. A project’s existing setup does not become invalid merely because Vitest is the default for new CLI projects. Consider migration when the new runner and its workflow suit the project, but account for custom builder settings and legacy test patterns.
Rank #4
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- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
What migration changes
Angular labels migration of an existing project to Vitest experimental. The documented migration requires the application build system, adds Vitest and a DOM emulator, and changes the test builder to @angular/build:unit-test. The new builder does not accept all old Karma builder options in the same place, so test-related build settings may need to move.
Audit and review the conversion
- Inspect custom
karma.conf.jsbehavior before removing or replacing it. - Review test-specific builder settings and move options where the new builder requires it.
- The refactoring schematic can convert common Jasmine patterns, but it does not install dependencies, change the builder, move build options, or remove old files.
- Complex or nested spy scenarios may not be converted correctly; review the schematic’s edits and run the suite.
- Zone-based helpers can be patched, but plan to move toward native async code and Vitest fake timers where appropriate.
Do not treat the schematic as a complete migration. Run and inspect the test suite after each migration stage, especially where custom configuration or asynchronous timing is involved.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshoot common failures
- The tests keep watching in CI. The environment may not set
CI=true. Set it, or runng test --no-watch --no-progress. - A test fails on a browser API. The selected DOM emulator may not implement the required API. Check whether the test needs a mock or should run in browser mode with an installed provider.
- Rendered component output is empty or stale. Confirm the component is configured and compiled, create the fixture, and trigger change detection before asserting rendered output.
- An HTTP test hangs or reports unmatched requests. Ensure the test captures and flushes each expected request, and use
HttpTestingController.verify()to find requests left outstanding. - Migration builder options are rejected or ignored. Review the new unit-test builder configuration; not all former Karma builder options are accepted in the same location.
- A migrated spy or timer test behaves differently. Review complex spy conversions manually and check whether legacy Zone-based timing should be replaced with native async patterns or Vitest fake timers.
- Coverage cannot run. Confirm
@vitest/coverage-v8is installed before runningng test --coverage.
Or skip the browser setup
If you need a screenshot of a page produced by a running Angular application, ScreenshotNeo can return an image or PDF from a single request. This is separate from unit testing: use Angular’s test runner for assertions about application behavior, and a screenshot endpoint when you need a captured page.
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- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
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For API options, see the ScreenshotNeo documentation.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://your-angular-app.example -o shot.webpScreenshotNeo accepts cookie or consent banners like a visitor and removes more than 60 known consent platforms, newsletter popups, and chat widgets before capture; those steps can be turned off. Bot checks, blank pages, timeouts, failed loads, and cache hits are not billed, and responses identify page verdict and billing status. Its MCP server provides take_screenshot, get_page_info, and capture_pdf tools for AI agents. The free plan includes 1,000 screenshots per month with no card; paid plans start at $5 for 3,000.
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