tests(shared): added mergeClasses tests

packages/shared/package.json

@@ -7,5 +7,12 @@
   "types": "src/index.ts",
   "type": "module",
   "author": "",
-  "license": "ISC"
+  "license": "ISC",
+  "scripts": {
+    "test": "vitest run",
+    "test:watch": "vitest watch"
+  },
+  "devDependencies": {
+    "vitest": "^2.1.1"
+  }
 }

packages/shared/tests/utils.spec.tsx

@@ -0,0 +1,21 @@
+import { describe, it, expect } from 'vitest';
+import { mergeClasses } from '../src/utils';
+
+describe('mergeClasses', () => {
+  it('merges classes', async () => {
+    const classes = mergeClasses('lucide', 'lucide-circle', 'custom-class');
+    expect(classes).toBe('lucide lucide-circle custom-class');
+  });
+  it('ignores empty string', async () => {
+    const classes = mergeClasses('lucide', 'lucide-circle', '');
+    expect(classes).toBe('lucide lucide-circle');
+  });
+  it('ignores undefined', async () => {
+    const classes = mergeClasses('lucide', 'lucide-circle', undefined);
+    expect(classes).toBe('lucide lucide-circle');
+  });
+  it('removes duplicates', async () => {
+    const classes = mergeClasses('lucide', 'lucide-circle', 'lucide');
+    expect(classes).toBe('lucide lucide-circle');
+  });
+});