advanced-js-mocking-patterns

What problem does it solve?

Advanced mocking patterns reduce flaky tests by isolating units from dependencies, enabling deterministic behavior across code paths.

Core Features & Use Cases

• Module mocking of dependencies with jest.mock/vi.mock
• Partial mocking with spies to verify interactions without full replacements
• Mock lifecycle management with setup/teardown hooks
• Fake timers to test time-dependent logic
• Custom mock implementations for complex behavior
• Use Case: test a network request flow without real network calls, ensuring correct handling of success and failure paths.

Quick Start

Run a test suite that demonstrates module mocking, spies, and fake timers.