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