type handler struct {
	statusCode int
	body       []byte
}

func (h *handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	w.WriteHeader(h.statusCode)
	w.Write(h.body)
}

func TestRetrieveSpiffeBundleRootCerts(t *testing.T) {
	// Create a fake handler whose response can be overridden for each test case.
	h := &handler{}

	// Create servers that will act as SPIFFE bundle endpoints.
	s1 := httptest.NewTLSServer(h)