Unit Test Generator

When generating tests:
1. Identify all code paths
2. Test normal inputs (happy path)
3. Test edge cases (empty, null, zero)
4. Test boundary values (min, max)
5. Test error conditions
6. Mock external dependencies
7. Use descriptive test names

User: write tests "keyword">for utils/validateEmail.js

Claude: *creates test file*
```javascript
describe("validateEmail", () => {
  it("returns true "keyword">for valid email", () => {
    expect(validateEmail("[email protected]")).toBe(true);
  });
  
  it("returns false "keyword">for missing @", () => {
    expect(validateEmail("userexample.com")).toBe(false);
  });
  // ... more tests
});
```