.gremlins.yaml

# Gremlins Mutation Testing Configuration
# https://github.com/go-gremlins/gremlins

# Packages to test (default: all in ./...)
test-packages:
  - .
  - ./cli/...
  - ./config/...
  - ./core/...
  - ./logging/...
  - ./metrics/...
  - ./middlewares/...
  - ./web/...

# Mutator types to enable
# Available: CONDITIONALS_BOUNDARY, CONDITIONALS_NEGATION, INCREMENT_DECREMENT,
#            INVERT_ASSIGNMENTS, INVERT_BITWISE, INVERT_BWASSIGN, INVERT_LOGICAL,
#            INVERT_LOOPCTRL, INVERT_NEGATIVES, REMOVE_SELF_ASSIGNMENTS
mutators:
  - CONDITIONALS_BOUNDARY    # Change < to <=, > to >=, etc.
  - CONDITIONALS_NEGATION    # Negate conditions (== to !=)
  - INCREMENT_DECREMENT      # Change ++ to -- and vice versa
  - INVERT_LOGICAL           # Invert && to ||, || to &&
  - INVERT_NEGATIVES         # Remove negation operators
  - INVERT_LOOPCTRL          # Change break to continue and vice versa

# Files/patterns to exclude from mutation
exclude:
  - "**/*_test.go"           # Test files
  - "**/test/**"             # Test helpers
  - "**/static/**"           # Static assets
  - "**/mock/**"             # Mock implementations
  - "**/adapters/mock/**"    # Mock adapters

# Coverage mode: only mutate code covered by tests
# This significantly speeds up mutation testing
coverage: true

# Threshold for mutation score (percentage of mutants killed)
# Build fails if score is below this value
threshold: 60

# Timeout multiplier for individual test runs
# Helps with tests that may take longer due to mutations
# Increased for integration tests which connect to real Docker daemon
timeout-coefficient: 5

# Number of parallel workers (0 = auto-detect based on CPU)
workers: 0

# Output format options
output:
  # Generate JSON report for CI integration
  json: mutation-report.json
  # Generate HTML report for detailed analysis
  html: mutation-report.html

# Diff mode: only test mutations in changed files (for CI efficiency)
# Set via CLI flag --diff for PR workflows
diff: false

# Tags for conditional compilation
# Note: Integration tests are NOT included in the main mutation test run because
# they connect to real Docker daemon and would cause timeouts for all packages.
#
# For Docker adapter mutation testing WITH integration tests, use:
#   gremlins unleash --config .gremlins-docker.yaml
#
# This achieves ~69% test efficacy vs ~50% without integration tests.
tags: ""

# Additional test flags
test-cpu: 0
# Increased timeout for integration tests with real Docker daemon
test-timeout: 120s