Stack Angular

Integration Tests

// Use Component Harnesses + HttpTestingController
describe('OrderListComponent', () => {
  it('should display orders after loading', async () => {
    const harness = await TestbedHarnessEnvironment.harnessForFixture(
      fixture, OrderListComponentHarness
    );
    await harness.clickRefresh();
    const items = await harness.getOrderItems();
    expect(items.length).toBeGreaterThan(0);
  });
});

Frameworks

• Jasmine for tests
• Component Harnesses for component testing
• HttpTestingController for service integration

Build & Test Commands

ng build
ng test --watch=false

Test Patterns by Component Classification

Presentational Components

Skip standalone tests — covered by parent component integration tests. Exception: if the component has 3+ conditional branches (e.g., *ngIf / @if chains), write a focused component test.

Smart/Container Components

// Component Harness + HttpTestingController for smart components
describe('DashboardComponent', () => {
  it('should load and display stats from service', async () => {
    const harness = await TestbedHarnessEnvironment.harnessForFixture(
      fixture, DashboardComponentHarness
    );
    const req = httpTestingController.expectOne('/api/stats');
    req.flush(mockStats);
    const cards = await harness.getStatCards();
    expect(cards.length).toBe(mockStats.length);
  });
});

Form-heavy Components

// Integration test for reactive form submission
describe('ProfileFormComponent', () => {
  it('should submit valid form data', async () => {
    const harness = await TestbedHarnessEnvironment.harnessForFixture(
      fixture, ProfileFormComponentHarness
    );
    await harness.fillName('Jane Doe');
    await harness.fillEmail('jane@example.com');
    await harness.clickSubmit();
    const req = httpTestingController.expectOne('/api/profile');
    expect(req.request.body.name).toBe('Jane Doe');
  });

  it('should show validation error for invalid email', async () => {
    const harness = await TestbedHarnessEnvironment.harnessForFixture(
      fixture, ProfileFormComponentHarness
    );
    await harness.fillEmail('not-an-email');
    await harness.clickSubmit();
    const error = await harness.getEmailError();
    expect(error).toBeTruthy();
  });
});

Unit test custom validators separately only when they have complex rules:

describe('passwordStrengthValidator', () => {
  it('should reject passwords without special characters', () => {
    const control = new FormControl('weakpassword');
    const result = passwordStrengthValidator(control);
    expect(result?.['passwordStrength']).toBeTruthy();
  });
});

Critical User Journey (E2E)

// Playwright Test — E2E for auth flow (runs in CI)
import { test, expect } from '@playwright/test';

test('login flow', async ({ page }) => {
  await page.goto('/login');
  await page.fill('[data-testid="email"]', 'user@example.com');
  await page.fill('[data-testid="password"]', 'securepassword');
  await page.click('[data-testid="login-button"]');
  await expect(page).toHaveURL('/dashboard');
  await expect(page.locator('[data-testid="welcome-message"]')).toBeVisible();
});

Visual/Layout Components

Write Playwright visual regression tests — these run in CI and catch regressions automatically:

// Playwright visual regression test (runs in CI)
test('sidebar matches visual baseline', async ({ page }) => {
  await page.goto('/dashboard');
  await expect(page.locator('[data-testid="sidebar"]')).toHaveScreenshot('sidebar.png');
});

For interactive spot-checks during development, use Playwright CLI (playwright-cli snapshot, playwright-cli screenshot). Neither replaces Playwright Test — see the testing skill's "Browser Testing Tools" section.

Data Display Components

// Integration test for data table with transformation
describe('OrderTableComponent', () => {
  it('should display formatted order data', async () => {
    const harness = await TestbedHarnessEnvironment.harnessForFixture(
      fixture, OrderTableComponentHarness
    );
    const req = httpTestingController.expectOne('/api/orders');
    req.flush([{ amount: 1500, date: '2024-01-15' }]);
    const rows = await harness.getRows();
    expect(rows.length).toBe(1);
    const amount = await rows[0].getAmount();
    expect(amount).toContain('$15.00');
  });
});

Security

• Trust Angular's built-in XSS protection — do not bypass with bypassSecurityTrust* unless absolutely necessary and reviewed
• Use HttpClient which includes XSRF protection by default
• Sanitize user input displayed via [innerHTML] using DomSanitizer

Read the project's applicable agent guidance (AGENTS.md for Codex, CLAUDE.md for Claude Code) and relevant docs/<topic>.md files for project-specific Angular conventions when they exist.