}

	foundFile := false
	foundSubDir := false
	for _, dir := range list {
		switch {
		case !dir.IsDir() && dir.Name() == "read_test.go":
			foundFile = true
		case dir.IsDir() && dir.Name() == "exec":
			foundSubDir = true
		}
	}
	if !foundFile {
		t.Fatalf("ReadDir %s: read_test.go file not found", dirname)
	}
	if !foundSubDir {
		t.Fatalf("ReadDir %s: exec directory not found", dirname)
	}