}
	out, err := cmd.CombinedOutput()
	if err != nil {
		t.Logf("> %s\n", strings.Join(args, " "))
		t.Fatalf("command failed: %s\n%s", err, out)
	}
}

// TestDependencyVersionsConsistent verifies that each module in GOROOT that
// requires a given external dependency requires the same version of that
// dependency.
//
// This property allows us to maintain a single release branch of each such