Update JavaScript Testing Practices and Principles by Kent C. Dodds.md

JavaScript Testing Practices and Principles by Kent C. Dodds.md

@@ -71,6 +71,7 @@ A fake version of something, often a function, function payload, or module
 - Test Object Factories can be a useful DRY strategy for use in `beforeEach` or `it`/`test` to get consistent reusable payloads for use in tests
 - TDD works well when it's very clear what work does and does not need to be done
 - Just like normal programming stay DRY
+- Mocking Vue component services is common via `jest.mock('path/to/service', mockImplementation)`
 
 ## Integration