package service import ( "net/http" "net/http/httptest" "testing" ) func TestHandlerReturnsServiceUnavailableWhenRuntimeIsNil(t *testing.T) { var runtime *Runtime request := httptest.NewRequest(http.MethodGet, "/healthz", nil) response := httptest.NewRecorder() runtime.Handler().ServeHTTP(response, request) if response.Code != http.StatusServiceUnavailable { t.Fatalf("空运行时状态码错误:%d", response.Code) } }