init project

tests/unit/theme.test.ts

@@ -0,0 +1,18 @@
+import { isThemePreference, resolveTheme, serverResolvedTheme } from '@/lib/theme/config';
+import { describe, expect, it } from 'vitest';
+
+describe('theme foundations', () => {
+  it('accepts only approved preferences', () => {
+    expect(isThemePreference('light')).toBe(true);
+    expect(isThemePreference('dark')).toBe(true);
+    expect(isThemePreference('system')).toBe(true);
+    expect(isThemePreference('sepia')).toBe(false);
+  });
+
+  it('keeps preference and resolved theme separate', () => {
+    expect(resolveTheme('system', true)).toBe('dark');
+    expect(resolveTheme('system', false)).toBe('light');
+    expect(resolveTheme('light', true)).toBe('light');
+    expect(serverResolvedTheme('system')).toBe('light');
+  });
+});