assert: mock: 我不知道要返回什么，因为方法调用是意外的

Question

我正在尝试使用 testify 在 Go 上创建单元测试。我要测试的函数非常简单，它会启动一个 SQL 事务，然后通过回购层从数据库中获取值，然后计算这些值。但是每当我尝试运行单元测试时，我总是遇到这个错误。

# go test -v usecase/calculate_test.go usecase/calculate.go usecase/other_related_usecase.go 

=== RUN   Test_Calculate

[2022-07-15 08:42:30] INFO: Start Calculation

--- FAIL: Test_Calculate (0.00s)

panic: 

assert: mock: I don't know what to return because the method call was unexpected.

        Either do Mock.On("BeginTxx").Return(...) first, or remove the BeginTxx() call.

        This method was unexpected:

                BeginTxx()

        at: [sql_repository.go:1 calculate.go:4 calculate_test.go:2] [recovered]

        panic: 

assert: mock: I don't know what to return because the method call was unexpected.

        Either do Mock.On("BeginTxx").Return(...) first, or remove the BeginTxx() call.

        This method was unexpected:

                BeginTxx()

        at: [sql_repository.go:1 calculate.go:4 calculate_test.go:2]

据我所知，我认为这是因为它无法在单元测试中找到预期的方法调用。但是，问题是我已经在onSQLMock字段中定义了方法调用。

func Test_Calculate(t *testing.T) {

  testCases := []struct {

    name string

    id int64

    onSQLMock func(sqlMock *mocks.SQLRepository)

    onOtherFuncMock func(otherFuncMock *mocks.OtherFuncMock)

    wantError bool

    expectedError string

  }{

    {

     name: "Successfully Calculated",

     onSQLMock: func(sqlMock *mocks.SQLRepository) {

       var tx *sqlx.Tx

       sqlRepo.On("BeginTxx").Return(tx, nil)

     },

     onOtherFuncMock: func(otherFuncMock *Mocks.OtherFuncMock) {

       // do something here

     },

     wantError: false,

    },{

     name: "Failed to calculate",

     onSQLMock: func(sqlMock *mocks.SQLRepository) {

       var tx *sqlx.Tx

       sqlRepo.On("BeginTxx").Return(tx, errors.New("Failed to begin tx")

     },

     onOtherFuncMock: func(otherFuncMock *mocks.OtherFuncMock) {

       // do something here

     },

     wantError: true,

     expectedError: "Failed to begin tx",

    },

  }

 }

Answer 1

你实际上并没有使用你的onSQLMock任何地方。usecase在将模拟存储库传递给实例之前使用它mockRepo := new(mocks.SQLRepository)testCase.onSQLMock(mockRepo)同样使用函数的参数：  onSQLMock: func(sqlMock *mocks.SQLRepository) {       var tx *sqlx.Tx       sqlMock.On("BeginTxx").Return(tx, nil)     },