How to Get Code Coverage from Integration Tests for Go Binaries?

Capturing Code Coverage from a Go Binary

Question:

How can code coverage metrics be captured when running integration tests against a Go binary?

Answer:

While the native Go coverage tool only works with unit tests, it is still possible to gather coverage data for integration tests.

Solution:

To achieve this:

1. Create a test file that executes the main() function:

   <code class="go">func TestMainApp(t *testing.T) {
       go main()
       // Start integration tests
   }</code>

2. Run the integration tests from within the main() test:

   <code class="go">cmd := exec.Command("./mybin", "somefile1")
   cmd.Run()</code>

3. Gather coverage statistics:

   <code class="go">coverProfile := "coverage.out"
   test.RunMain()
   if err := testing.StartCoverage(coverProfile); err != nil {
       log.Fatalf("Coverage: %v", err)
   }
   defer testing.StopCoverage(coverProfile)</code>

4. Generate the coverage report:

   <code class="go">if err := testing.RunTests(); err != nil {
       log.Fatalf("Coverage: %v", err)
   }
   cmd := exec.Command("go", "tool", "cover", "-html=coverage.out")
   cmd.Run()</code>

Additional Reference:

• [Go coverage with external tests](https://blog.golang.org/cover-external-tests)

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