return
			}

			// test the client talks to the endpoint we expect with the credentials we expect
			username = ""
			_, err = config.Client.Discovery().RESTClient().Get().AbsPath("/").DoRaw(context.TODO())
			if err != nil {
				t.Error(err)
				return
			}
			if username != tc.expectedUsername {
				t.Errorf("expected server call with user %q, got %q", tc.expectedUsername, username)
			}
		})