错误断言包含和等于未按预期工作

编程问答 2022-05-28

问题描述

我从一个函数中断言一个错误，我已经为该函数提供了这样的输入，以便它会抛出一个错误。我想检查错误是否正确。

这是我的功能：

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",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)
    }
}

这是我得到的错误：

--- FAIL: TestK8testing (0.00s)
/Users/ngupta59/hcc-dm/pkg/dm-agent/cmd/action_validate_dmjob_test.go:296: 
        Error Trace:    action_validate_dmjob_test.go:296
        Error:          Not equal: 
                        expected: string("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")
                        actual  : *errors.errorString(&errors.errorString{s:"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"})
        Test:           TestK8testing

我的代码有什么问题？我的 assert.contains 也不起作用。

解决方法

错误内置类型是一个接口：

type error interface {
    Error() string
}

因此，如果您想检查错误值，实际上需要调用 Error() string 方法。

此资源解释了基础知识：https://blog.golang.org/error-handling-and-go

Go 1.13 的基础扩展：https://blog.golang.org/go1.13-errors

assertassertgogolandunit-testing