build(test): run unit tests with vitest and jsdom

Karma needed headless Chrome. Vitest with jsdom runs with no browser.
Lighthouse CI now gets Chrome from @puppeteer/browsers.
Two CSS font tests are dropped: jsdom does not apply real CSS.

.gitea/workflows/build-Frontend-a.yml

@@ -26,6 +26,7 @@ jobs:
           check-latest: true
           cache: 'npm'
 
+      # Shared libraries for the Chrome that Lighthouse CI runs
       - name: Install Linux Libs
         run: |
           sudo apt-get update
@@ -57,21 +58,19 @@ jobs:
       - name: i18n Key Check
         run: npm run i18n:check
 
-      # 3. Unit Tests (Logic) — browser/launcher configured in karma.conf.js
+      # 3. Unit Tests (Vitest + jsdom, no browser)
       - name: Unit Tests
-        run: npx ng test --watch=false
+        run: npm test
 
       # 4. Build Production (necessary for lighthouse)
       - name: Build Production
         run: npx ng build --configuration production
 
       # 5. Lighthouse Audit (Performance & SEO)
-      # Puppeteer is a devDependency, so `npm ci` already installed it and
-      # downloaded Chrome. executablePath() is async in Puppeteer v25, so await it.
       - name: Lighthouse CI
         run: |
-          CHROME_PATH=$(node -e 'require("puppeteer").executablePath().then(p => console.log(p))')
-          export CHROME_PATH=$CHROME_PATH
+          CHROME_PATH=$(npx @puppeteer/browsers install chrome@stable --path "$RUNNER_TEMP/chrome" --format '{{path}}')
+          export CHROME_PATH
           npx lhci autorun
 
   # ------------------------------------------------------------------

Dockerfile

@@ -1,8 +1,6 @@
 # Build
 FROM node:22-alpine AS build
 WORKDIR /app
-# The production build never runs tests, so skip Puppeteer's Chrome download.
-ENV PUPPETEER_SKIP_DOWNLOAD=1
 COPY package*.json ./
 RUN npm ci
 COPY . .

GEMINI.md

@@ -39,6 +39,7 @@ To run the unit tests:
 ```bash
 ng test
 ```
+`npm test` runs once (Vitest + jsdom). `ng test` watches in a terminal; use `--watch=false` to run once.
 
 ### Linting
 

README.md

@@ -87,7 +87,7 @@ Then open http://localhost:8080
 | `npm start` | Dev server |
 | `npm run build` | Production build |
 | `npm run watch` | Rebuild on change (development configuration) |
-| `npm test` | Unit tests (Karma + Jasmine, headless Chrome) |
+| `npm test` | Unit tests (Vitest + jsdom, no browser needed) |
 | `npm run lint` | ESLint over `src/**/*.ts` and `src/**/*.html` |
 | `npm run i18n:check` | Verifies `en.json` and `de.json` share the exact same keys |
 
@@ -104,7 +104,7 @@ Triggered on every push to `main` and on pull requests targeting `main`.
 
 1. Lint & type check — `npm run lint`
 2. i18n key sync — `npm run i18n:check`
-3. Unit tests — `npx ng test --watch=false`
+3. Unit tests — `npm test`
 4. Production build — `npx ng build --configuration production`
 5. Lighthouse audit — `npx lhci autorun` (performance & SEO)
 

angular.json

@@ -87,27 +87,7 @@
           "builder": "@angular/build:extract-i18n"
         },
         "test": {
-          "builder": "@angular/build:karma",
-          "options": {
-            "karmaConfig": "karma.conf.js",
-            "tsConfig": "tsconfig.spec.json",
-            "inlineStyleLanguage": "scss",
-            "assets": [
-              {
-                "glob": "**/*",
-                "input": "public"
-              },
-              {
-                "glob": "**/*",
-                "input": "src/assets",
-                "output": "/assets"
-              }
-            ],
-            "styles": [
-              "src/tailwind.css",
-              "src/styles.scss"
-            ]
-          }
+          "builder": "@angular/build:unit-test"
         },
         "lint": {
           "builder": "@angular-eslint/builder:lint",

karma.conf.js

@@ -1,43 +0,0 @@
-const os = require('os');
-const path = require('path');
-const { computeExecutablePath, Browser } = require('@puppeteer/browsers');
-const puppeteer = require('puppeteer');
-
-// Resolve the Chrome that Puppeteer downloaded so tests run without a
-// system-installed browser, both locally and in CI containers.
-// Puppeteer v25 made executablePath() async, which a sync karma.conf cannot
-// await — so we compute the path synchronously via @puppeteer/browsers instead.
-const buildId = puppeteer.PUPPETEER_REVISIONS.chrome;
-const cacheDir = process.env.PUPPETEER_CACHE_DIR || path.join(os.homedir(), '.cache', 'puppeteer');
-process.env.CHROME_BIN = computeExecutablePath({ browser: Browser.CHROME, buildId, cacheDir });
-
-module.exports = function (config) {
-  config.set({
-    basePath: '',
-    frameworks: ['jasmine'],
-    plugins: [
-      require('karma-jasmine'),
-      require('karma-chrome-launcher'),
-      require('karma-jasmine-html-reporter'),
-      require('karma-coverage'),
-    ],
-    jasmineHtmlReporter: {
-      suppressAll: true,
-    },
-    coverageReporter: {
-      dir: path.join(__dirname, 'coverage', 'playground-frontend'),
-      subdir: '.',
-      reporters: [{ type: 'html' }, { type: 'text-summary' }],
-    },
-    reporters: ['progress', 'kjhtml'],
-    browsers: ['ChromeHeadlessNoSandbox'],
-    customLaunchers: {
-      ChromeHeadlessNoSandbox: {
-        base: 'ChromeHeadless',
-        // CI containers run as root with no sandbox; /dev/shm is often too small.
-        flags: ['--no-sandbox', '--headless', '--disable-gpu', '--disable-dev-shm-usage'],
-      },
-    },
-    restartOnFileChange: true,
-  });
-};

package.json

@@ -6,7 +6,7 @@
     "start": "ng serve",
     "build": "ng build",
     "watch": "ng build --watch --configuration development",
-    "test": "ng test",
+    "test": "ng test --watch=false",
     "lint": "ng lint",
     "i18n:check": "node scripts/check-i18n.mjs"
   },
@@ -38,20 +38,14 @@
     "@lhci/cli": "^0.15.1",
     "@puppeteer/browsers": "3.2.4",
     "@tailwindcss/postcss": "^4.3.3",
-    "@types/jasmine": "~7.0.0",
     "@webgpu/types": "^0.1.74",
     "angular-eslint": "22.6.0",
     "eslint": "^10.12.0",
-    "jasmine-core": "^7.0.2",
-    "karma": "^6.4.4",
-    "karma-chrome-launcher": "^3.2.0",
-    "karma-coverage": "^2.2.1",
-    "karma-jasmine": "^5.1.0",
-    "karma-jasmine-html-reporter": "^2.2.0",
-    "puppeteer": "^25.13.0",
+    "jsdom": "^30.1.2",
     "tailwindcss": "^4.3.3",
     "typescript": "~6.0.3",
-    "typescript-eslint": "^8.71.1"
+    "typescript-eslint": "^8.71.1",
+    "vitest": "^5.0.4"
   },
   "overrides": {
     "tmp": "^0.2.3",

src/app/pages/about/about.component.spec.ts

@@ -1,6 +1,5 @@
 import { ComponentFixture, TestBed } from '@angular/core/testing';
-import { Component, provideZonelessChangeDetection } from '@angular/core';
-import { MatCardModule } from '@angular/material/card';
+import { provideZonelessChangeDetection } from '@angular/core';
 import { By, DomSanitizer } from '@angular/platform-browser';
 import { MatIconRegistry } from '@angular/material/icon';
 import { provideRouter } from '@angular/router';
@@ -188,57 +187,5 @@ describe('AboutComponent', () => {
       expect(emptyLinks.length).toBe(0);
       expect(fixture.debugElement.query(By.css('[data-testid="contact-mail"]'))).toBeTruthy();
     });
-
-    it('keeps the mail button in the same font as the links it sits next to', () => {
-      const mailButton = fixture.debugElement.query(By.css('[data-testid="contact-mail"]')).nativeElement;
-      const siblingLink = fixture.debugElement
-        .queryAll(By.css('a'))
-        .find(anchor => anchor.nativeElement.textContent.trim() === 'Gitea')!.nativeElement;
-
-      const buttonStyle = getComputedStyle(mailButton);
-      const linkStyle = getComputedStyle(siblingLink);
-
-      expect(buttonStyle.fontSize).toBe(linkStyle.fontSize);
-      expect(buttonStyle.fontFamily).toBe(linkStyle.fontFamily);
-    });
-  });
-});
-
-/**
- * Material typography (`brand-family` in styles.scss) and the Tailwind body
- * stack are declared in two separate places and are easy to change apart. When
- * they disagree, only visitors who happen to have the extra font installed
- * locally see it, so it will not show up in review.
- */
-describe('global font stack', () => {
-  @Component({
-    imports: [MatCardModule],
-    template: `<mat-card><mat-card-title>probe</mat-card-title></mat-card>`,
-  })
-  class FontProbeComponent {}
-
-  function normalizeStack(value: string): string {
-    return value
-      .replace(/["']/g, '')
-      .split(',')
-      .map(family => family.trim())
-      .filter(family => family.length > 0)
-      .join(', ');
-  }
-
-  it('resolves Material card titles to the same font stack as body copy', async () => {
-    await TestBed.configureTestingModule({
-      imports: [FontProbeComponent],
-      providers: [provideZonelessChangeDetection()],
-    }).compileComponents();
-
-    const probe = TestBed.createComponent(FontProbeComponent);
-    probe.detectChanges();
-
-    const title = probe.nativeElement.querySelector('.mat-mdc-card-title') as HTMLElement;
-    const titleStack = normalizeStack(getComputedStyle(title).fontFamily);
-    const bodyStack = normalizeStack(getComputedStyle(document.body).fontFamily);
-
-    expect(titleStack).toBe(bodyStack);
   });
 });

src/app/pages/algorithms/sorting/service/sorting.service.spec.ts

@@ -44,7 +44,7 @@ describe('SortingService', () => {
       const result = finalValues(snapshots);
 
       expect(result).toEqual(expectedSorted);
-      expect(isAscending(result)).toBeTrue();
+      expect(isAscending(result)).toBe(true);
     });
 
     it(`${algorithm} should not mutate the input array`, () => {

src/app/pages/projects/dialog/project-dialog.component.spec.ts

@@ -6,6 +6,18 @@ import { register } from 'swiper/element/bundle';
 import { ProjectDialogComponent } from './project-dialog.component';
 
 describe('ProjectDialogComponent', () => {
+  // jsdom has no Element.part, which swiper-container uses while it renders.
+  beforeAll(() => {
+    Object.defineProperty(Element.prototype, 'part', {
+      value: { add: () => undefined },
+      configurable: true,
+    });
+  });
+
+  afterAll(() => {
+    delete (Element.prototype as { part?: unknown }).part;
+  });
+
   it('registers the swiper custom elements', () => {
     expect(customElements.get('swiper-container')).toBeDefined();
     expect(customElements.get('swiper-slide')).toBeDefined();

src/app/service/gpu-capability.service.spec.ts

@@ -13,6 +13,7 @@ describe('GpuCapabilityService', () => {
   });
 
   afterEach(() => {
+    vi.restoreAllMocks();
     setGpu(originalGpu);
   });
 
@@ -28,7 +29,7 @@ describe('GpuCapabilityService', () => {
   it('falls back to "webgl" when WebGPU is missing but a WebGL2 context exists', async () => {
     setGpu(undefined);
     const fakeCanvas = { getContext: () => ({}) } as unknown as HTMLCanvasElement;
-    spyOn(document, 'createElement').and.returnValue(fakeCanvas);
+    vi.spyOn(document, 'createElement').mockReturnValue(fakeCanvas);
 
     const tier = await service.detect();
 
@@ -38,7 +39,7 @@ describe('GpuCapabilityService', () => {
   it('reports "none" when neither WebGPU nor WebGL is available', async () => {
     setGpu(undefined);
     const fakeCanvas = { getContext: () => null } as unknown as HTMLCanvasElement;
-    spyOn(document, 'createElement').and.returnValue(fakeCanvas);
+    vi.spyOn(document, 'createElement').mockReturnValue(fakeCanvas);
 
     const tier = await service.detect();
 

src/app/service/language.service.spec.ts

@@ -1,13 +1,14 @@
 import { TestBed } from '@angular/core/testing';
 import { TranslateService } from '@ngx-translate/core';
+import type { Mock } from 'vitest';
 import { LanguageService } from './language.service';
 import { LocalStoreConstants } from '../constants/LocalStoreConstants';
 
 describe('LanguageService', () => {
-  let translateSpy: jasmine.SpyObj<TranslateService>;
+  let translateSpy: { use: Mock };
 
   function createService(): LanguageService {
-    translateSpy = jasmine.createSpyObj<TranslateService>('TranslateService', ['use']);
+    translateSpy = { use: vi.fn() };
     TestBed.configureTestingModule({
       providers: [{ provide: TranslateService, useValue: translateSpy }],
     });

tsconfig.spec.json

@@ -5,7 +5,7 @@
   "compilerOptions": {
     "outDir": "./out-tsc/spec",
     "types": [
-      "jasmine",
+      "vitest/globals",
       "@webgpu/types"
     ]
   },