// the cmd/go tests.
func TestMain(m *testing.M) {
	// When CMDCOVDATA_TEST_RUN_MAIN is set, we're reusing the test
	// binary as cmd/cover. In this case we run the main func exported
	// via export_test.go, and exit; CMDCOVDATA_TEST_RUN_MAIN is set below
	// for actual test invocations.
	if os.Getenv("CMDCOVDATA_TEST_RUN_MAIN") != "" {
		cmdcovdata.Main()
		os.Exit(0)
	}
	flag.Parse()