错误的断言包含并等于未按预期工作

Question

我正在断言函数中的错误，我已经为函数提供了这样的输入，以便它将引发错误。我想检查错误是否正确。

这是我的函数：

func validateK8ResourcesLength(resource prm.Resource) error {

    name := resource.GetName()

    namespace := resource.GetNamespace()

    k8sResourceName := fmt.Sprintf("%s-%s", namespace, name)

    if len(k8sResourceName) > common.K8sNameLength {

        return fmt.Errorf("Namespace (%s) and Name (%s) length combined must not be greater than 48 chars", namespace, name)

    }

    return nil

}

我的测试代码：

func TestK8testing(t *testing.T) {

    ctrl := gomock.NewController(t)

    defer ctrl.Finish()

    mockContext := prmmock.NewMockStepContext(ctrl)

    mockResource := prmmock.NewMockResource(ctrl)

    mockClient := prmmock.NewMockClient(ctrl)

    // testClient := fake.NewFakeClientWithScheme(runtime.NewScheme())

    lables := make(map[string]string)

    mockClient.EXPECT().GetResource(gomock.Any(), gomock.Any()).Return(mockResource, nil).AnyTimes()

    mockContext.EXPECT().Resource().Return(mockResource).AnyTimes()

    mockResource.EXPECT().GetKind().Return("data-movement-v1-nonexist").AnyTimes()

    mockResource.EXPECT().GetName().Return("test-dm-more-then-forty-eight-charactors-this-should-fail").AnyTimes()

    mockResource.EXPECT().GetNamespace().Return("ns-more-then-forty-eight-charactors-this-should-fail").AnyTimes()

    mockResource.EXPECT().GetLabels().Return(lables).AnyTimes()

    mockResource.EXPECT().GetID().Return(prm.NewResourceID("hcc-dm", "data-movement-v1", "test-dm")).AnyTimes()

    err := validateK8ResourcesLength(mockResource)

    assert.Error(t, err)

    if assert.Error(t, err) {

        //assert.Contains(t, err, "length combined must not be greater")

        assert.Equal(t, "Namespace (ns-more-then-forty-eight-charactors-this-should-fail) and Name (test-dm-more-then-forty-eight-charactors-this-should-fail) length combined must not be greater than 48 chars", err)

    }

}

我的代码有什么问题？我也不起作用。assert.contains

Answer 1

错误内置类型是一个接口：type error interface {     Error() string     }因此，如果要检查错误值，则实际上需要调用该方法。Error() string此资源介绍了基础知识：https://blog.golang.org/error-handling-and-go以及 Go 1.13 对基础知识的扩展：https://blog.golang.org/go1.13-errors