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Root cause: The ThemeService calls window.matchMedia(...) as a class field initializer (line 20 of theme.service.ts), which runs immediately when the service is instantiated. jsdom (the test environment) doesn't implement window.matchMedia, so every test that touched Angular's DI tree — including all tests where ThemeService was auto-provided via providedIn: 'root' — crashed with TypeError: window.matchMedia is not a function. Fix: 1. Created src/setup-tests.ts — a global test setup file that defines a minimal window.matchMedia stub. 2. Registered it via setupFiles in angular.json's test options so the @angular/build:unit-test builder picks it up before any spec runs
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Dark theme added with other style changes. resolves #162