Test Metric

How Much Testing?

• Code-to-test ratio
• Coverage

How Much Quality?

• ABC score
• Cyclomatic complexity

Coverage Types

• Statement Coverage (lines of code)
• Branch Coverage (Condition coverage, 2(T/F) per each if-else branch)
• Path Coverage (# of paths branched by if-else)

ABC Score

• A = # of assignment
• B = # of branch(jump, usually function calls)
• C = # of conditions
• RMS of A, B, C

Cyclomatic Complexity

• Construct control-flow graph
• E = # of edge
• N = # of node
• P = # of connected components
• CC = E - N + 2P (in most simple case, P = 1, N = E + 1 ⇒ CC = 1)

Testing Methods

• Equivalence Testing
  • Groups of inputs whose expected output is equivalent
  • Only one input per group is enough
• Boundary Testing
  • Focus on edge case
• Control-flow Testing (White box)
  • Ensures Condition Coverage
  • Ensures Path Coverage
• State-based Testing (White box)

Test-Driven Development (TDD)

• Write test first (RED)
• Code that pass test (GREEN)
• Refactor the code (Refactor)
• Effective to test logic / behavior

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