How Can I Capture Go Code Coverage During Integration Testing?

Capturing Code Coverage for Go Binaries during Integration Testing

Gathering code coverage metrics during unit testing is straightforward in Go. However, capturing coverage data during integration tests run against the binary itself is also desirable.

Can it be Done?

Yes, it is possible to measure code coverage for integrations tests involving Go binaries. However, the standard Go coverage tool only operates in conjunction with the testing package.

Solution: Leverage the Testing Framework

To bridge this gap, coerce your integration tests into the Go testing framework. This requires:

1. Creating a test file that invokes your main() function within a go routine:

   func TestMainApp(t *testing.T) {
    go main()
    // .. then start your integration tests
   }

2. Launching integration tests from within the running app using exec.Cmd.
3. Collecting coverage statistics as usual.

Additional Reference

For a detailed implementation, refer to the article "Go coverage with external tests" for a similar approach.

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