LoongCollector Testing Standards

Test Categories

1. Unit Tests (C++)

• Use Google Test (GTest) / Google Mock
• Place in core/unittest/
• Cover success and failure paths
• Core logic must have 100% coverage
• Test boundary conditions explicitly
• Test naming: accurately describe behavior being tested
• Each core/unittest/*/ directory produces one executable
• Build and run tests from inside build/ to ensure relative paths and temp files work correctly
• See skills/compile/SKILL.md for build & run instructions

2. Unit Tests (Go)

• Use standard testing package
• Table-driven tests for function coverage
• Integration tests via E2E framework

3. E2E Tests

• BDD Godog framework
• Configuration-driven via .feature files
• See skills/e2e/SKILL.md for complete guide (design → write → run → debug)

4. Benchmarks

• Required for performance-sensitive code paths
• Compare against baseline versions
• Measure throughput, latency, CPU/Memory usage

E2E Test Quick Reference

Feature File Structure

@input
Feature: input file
  Test input file

  @e2e @host
  Scenario: TestInputFileWithRegexSingle
    Given {host} environment
    Given subcribe data from {sls} with config
    """
    enable: true
    inputs:
      - Type: input_file
    """
    When generate {100} regex logs to file {/tmp/loongcollector/regex_single.log}, with interval {100}ms
    Then there is {100} logs

Behavior Types

Type	Purpose
Given	Setup/prepare test conditions
When	Trigger test actions (e.g., log generation)
Then	Verify test results

Environment Tags

• @host - Host environment
• @k8s - Kubernetes environment
• @docker-compose - Docker Compose environment
• @e2e - E2E test marker
• @regression - Regression test marker

Adding New Test Behaviors

1. Write the Go function in the appropriate directory:
   • cleanup/ - Post-test cleanup (auto-executed)
   • control/ - Control operations (init, config)
   • setup/ - Environment setup
   • trigger/ - Data generation
   • verify/ - Result verification
2. Function signature: func Name(ctx context.Context, params...) (context.Context, error)
3. Register in test/e2e_enterprise/main_test.go via scenarioInitializer
4. Use in feature files with {param} syntax

Strict Rules

• Do NOT change behavior of the method being tested
• Do NOT modify existing test behaviors in engine
• Always start trigger When begin trigger BEFORE generating logs
• Only use registered behaviors from test/engine/steps.go
• Verify behavior type matches (Given/When/Then)

Test Naming

• Format: Test${FunctionName}${CaseBriefDescription}
• Examples: TestInputFileWithBlackListDir, TestInputFileWithRegexSingle
• Must include @e2e and environment tags

Benchmark Testing

For performance-sensitive code:

1. Provide baseline comparison
2. Measure: throughput, latency, CPU profile, memory profile
3. Run under realistic load conditions
4. Document methodology and results