vamseeachanta London vs Chicago School (+2)
London vs Chicago School
| Aspect | London (Mockist) | Chicago (Classicist) |
|---|---|---|
| Focus | Behavior/Interactions | State |
| Isolation | Mock all collaborators | Use real objects |
| Direction | Outside-in | Inside-out |
| Test What | HOW objects talk | WHAT objects produce |
| Coupling | To implementation | To behavior |
Outside-In Development Flow
Acceptance Test (failing)
|
v
Controller Test (failing)
|
v
Service Test (failing)
|
v
Repository Test (failing)
|
v
Implement (make tests pass from bottom up)
Mock Types
// Stub: Returns canned responses
const stubRepo = { findById: jest.fn().mockResolvedValue(user) };
// Mock: Verifies interactions
const mockNotifier = { send: jest.fn() };
// Later: expect(mockNotifier.send).toHaveBeenCalledWith(expectedArgs);
// Spy: Wraps real object, records calls
const spyLogger = jest.spyOn(logger, 'info');