docker / buildx

Testing and Debugging

Testing

Unit Tests

  • Purpose: To test individual components of the codebase in isolation. This helps ensure that each component functions as expected.

  • Location: Unit tests are located in the pkg directory, in files named *_test.go.

  • Examples:

    • pkg/builder/buildkit_test.go: Contains unit tests for the buildkit package, which is responsible for interacting with BuildKit.
    • pkg/driver/docker_test.go: Contains unit tests for the docker package, which provides the Docker driver for Buildx.

Integration Tests

  • Purpose: To test how different components of the codebase interact with each other. This helps ensure that the codebase functions as a whole.

  • Location: Integration tests are located in the test directory, in files named *_test.go.

  • Examples:

    • test/build_test.go: Contains integration tests for the build command, which is used to build Docker images.
    • test/run_test.go: Contains integration tests for the run command, which is used to run Docker containers.

End-to-End Tests

  • Purpose: To test the entire Buildx workflow from start to finish. This helps ensure that Buildx works correctly in real-world scenarios.

  • Location: End-to-end tests are located in the test directory, in files named *_test.go.

  • Examples:

    • test/end_to_end_test.go: Contains end-to-end tests that cover the entire Buildx workflow.

Debugging

Logging

  • Purpose: To provide information about the execution of the Buildx codebase. This can be used to diagnose issues and understand how the code is behaving.

  • Location: Logging is implemented using the standard log package in Go.

  • Examples:

    • Error logging: log.Printf("error: %v", err)
    • Debug logging: log.Printf("debug: %v", data)

Tracing

  • Purpose: To provide a detailed timeline of the execution of the Buildx codebase. This can be used to identify performance bottlenecks and track the flow of data through the system.

  • Location: Tracing is implemented using the opentracing package.

  • Examples:

    • buildx.go: The buildx command uses tracing to track the execution of the build process.
    • driver.go: The driver package uses tracing to track the execution of the driver.

Debugging Tools

  • Purpose: To provide tools for inspecting and manipulating the state of the Buildx codebase. This can be used to debug issues that are difficult to diagnose using logging and tracing.

  • Location: The go tool provides a variety of debugging tools, such as gdb and dlv.

  • Examples:

    • dlv debug buildx: Use dlv to debug the buildx command.
    • gdb buildx: Use gdb to debug the buildx command.

Other Debugging Techniques

  • Using a debugger: Use a debugger to step through the code and inspect the state of the variables.
  • Adding logging statements: Add logging statements to the code to track the execution flow and inspect the values of variables.
  • Inspecting logs and tracing data: Examine the logs and tracing data to identify potential issues.

Running Tests

  • Unit Tests:
    • go test ./pkg/... - Runs unit tests in the pkg directory.
  • Integration and End-to-End Tests:
    • go test ./test/... - Runs integration and end-to-end tests in the test directory.
  • Running specific tests:
    • go test -run=TestMyFunction ./pkg/somepackage - Runs only the test with the name TestMyFunction in the somepackage directory.
  • Specifying a test coverage profile:
    • go test -coverprofile=coverage.out ./pkg/... - Generates a coverage profile in the coverage.out file.

Contributing to Testing and Debugging

  • Write tests: Write tests for new features and bug fixes.
  • Improve existing tests: Improve the quality and coverage of existing tests.
  • Add logging and tracing: Add logging and tracing statements to the codebase to help with debugging.
  • Contribute to the documentation: Improve the documentation for testing and debugging.

Additional Information

This outline provides a general overview of testing and debugging in Buildx. For more specific information, please refer to the source code and the documentation.