What To Test - KeynesYouDigIt/Knowledge GitHub Wiki

Changing an implementation shouldn't break a test.

Units

• Public methods
• All branches of code execution
• Unexpected user inputs
• Stub behaviors of other units
• Shallow mount

Not

• Interactions between units
• Library behavior
• Boilerplate

Integration

• Integration between units that have been stubbed
• Integration between applications you control
• Edge and failure cases between units
• Interactions that don't cross boundaries

Components

• Favor pure components
• No implementation details
• Full mount

Features

• Common user interactions
• Common error cases
• UI logic that isn't covered by units
• Calls to third-party services

Not

• Edge cases
• Parts that have no user behavior
• Third-party services