Testing Strategies Skill

Systematic testing for confidence without over-testing.

Testing Pyramid

Level	Volume	Speed	Purpose
Unit	Many	Fast	Individual functions
Integration	Some	Medium	Component boundaries
E2E	Few	Slow	User journeys

Anti-pattern: Inverted pyramid (too many E2E, few unit).

Unit Test Pattern (AAA)

test('should [behavior] when [condition]', () => {
    // Arrange - setup
    // Act - execute
    // Assert - verify
});

What to Mock

Mock	Don't Mock
External services	Your own code
Time/randomness	Pure functions
Network calls	Business logic

Coverage Philosophy

Range	Interpretation
50-70%	Reasonable
70-85%	Good, diminishing returns
85%+	Often wasteful

Focus: Coverage of changed code.

Don't Test

• Third-party internals
• Framework behavior
• Private implementation
• Trivial getters/setters

TDD Cycle

Red → Green → Refactor

Synapses

See synapses.json for connections.