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skills/test-generation/SKILL.md

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+# Test Generation
+
+Create thorough, maintainable test suites covering happy paths, edge cases, and error handling.
+
+## Test Design
+
+| Principle | Application |
+|-----------|-------------|
+| Clear names | `should return X when Y` |
+| AAA pattern | Arrange → Act → Assert |
+| One behavior | Each test verifies one thing |
+| Isolation | No shared state between tests |
+| Specific asserts | `toEqual([1,2,3])` not `toBeTruthy()` |
+
+## Coverage Checklist
+
+- ✓ **Happy path:** Normal operation
+- ✓ **Edge cases:** null, empty, 0, -1, MAX_INT, special chars
+- ✓ **Errors:** Invalid inputs, missing params, exceptions
+- ✓ **Integration:** External deps mocked
+
+## Framework Quick Reference
+
+| Framework | Structure | Assert | Mock |
+|-----------|-----------|--------|------|
+| **Jest** | `describe/it` | `expect().toBe/toEqual` | `jest.mock()` |
+| **pytest** | `test_name()` | `assert x == y` | `mocker.patch()` |
+| **JUnit** | `@Test` | `assertEquals()` | `@Mock` + Mockito |
+| **Mocha** | `describe/it` | Chai `expect().to` | Sinon |
+| **RSpec** | `describe/it` | `expect().to eq` | `allow().to receive` |
+| **Go** | `TestName(t)` | `t.Error()` | Manual/testify |
+
+## Mocking Strategy
+
+**Mock:** API calls, DB, file system, time, external services
+
+**Don't mock:** Simple data, pure functions, code under test
+
+## Example Structure
+
+```javascript
+describe('UserService', () => {
+  describe('createUser', () => {
+    it('should create user with valid data', () => {
+      // Arrange
+      const data = { name: 'John', email: 'john@test.com' }
+      // Act
+      const user = createUser(data)
+      // Assert
+      expect(user.name).toBe('John')
+    })
+
+    it('should throw when email invalid', () => {
+      expect(() => createUser({ email: 'bad' })).toThrow(ValidationError)
+    })
+  })
+})
+```