How Can You Capture Code Coverage in Go Binary Integration Tests?

Covering the Uncoverable: Capturing Code Coverage in Go Binary Integration Tests

While capturing code coverage metrics from unit tests is a straightforward process, the same cannot be said for integration tests executed against the binary itself. However, a workaround exists that leverages the testing framework.

Solution: Harnessing the Go Testing Framework

The key lies in coercing integration tests into the testing framework by:

1. Creating a Test File:

   • Execute the main() function as a goroutine:

     func TestMainApp(t *testing.T) {
       go main()
       // Start integration tests here
     }

2. Executing Integration Tests:

   • Use exec.Cmd to initiate integration tests while the app runs in a test.

3. Collecting Coverage:

   • Execute the coverage tool as usual to gather statistics.

Additional Resources

For further insights into this approach, refer to the article "Go coverage with external tests." While it may have been written a year ago, the underlying concepts remain relevant.

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