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Go Binary Code Coverage

Go Binary Code Coverage

1
posts
2020

This post introduces Bincover, an open-source tool developed by Confluent to measure code coverage for Go binaries, particularly for end-to-end and system tests. It addresses limitations of the built-in `go test` tool by enabling coverage measurement for binaries that execute `main()` and handle panics or `os.Exit()` calls. Bincover instruments binaries to collect coverage profiles, supports passing command-line arguments and environment variables, and merges profiles from multiple test runs. This capability is crucial for ensuring the robustness and testability of Go-based Confluent products like CLIs.

2020

Measuring Go Code Coverage with Bincover

4/30/2020

Introduces Bincover, an open-source tool for measuring Go binary code coverage. Details the technical approach of instrumenting binaries with a fake test that runs the main function, and how Bincover enhances this by handling command-line arguments, panics, and `os.Exit()` calls. Explains the implementation details of argument parsing via an args file, coverage profile collection using `-test.coverprofile`, and metadata collection for exit codes and cover modes. Provides a practical example of using Bincover with a simple Go application and its test suite.