ApplyMethod error occurred, target type and double type are different

[mmccto1500]

My code:

type sampleStruct struct {
    ctx context.Context
}

func (ss *sampleStruct) Test(a int, b string) error {
    fmt.Println("this is test")
    // ....
    return nil
}

mOne := &sampleStruct{}

patchMethodOne := gomonkey.ApplyMethod(reflect.TypeOf(mOne), "Test",
                    func(a int, b string) error {
    // this is patch part
    return nil
})

defer patchMethodOne.close()

This code will bring out an error which indicates the following content:

panic: target type(func(*sampleStruct, a int, b string) error) and double type(func(a int, b string) error) are different

Is there any idea about this problem?

[qiuchengxuan]

change

patchMethodOne := gomonkey.ApplyMethod(reflect.TypeOf(mOne), "Test",
                    func(a int, b string) error {
    // this is patch part
    return nil
})

to

patchMethodOne := gomonkey.ApplyMethod(reflect.TypeOf(mOne), "Test",
                    func(ss *sampleStruct, a int, b string) error {
    // this is patch part
    return nil
})

[mmccto1500]

change

patchMethodOne := gomonkey.ApplyMethod(reflect.TypeOf(mOne), "Test",
                    func(a int, b string) error {
    // this is patch part
    return nil
})

to

patchMethodOne := gomonkey.ApplyMethod(reflect.TypeOf(mOne), "Test",
                    func(ss *sampleStruct, a int, b string) error {
    // this is patch part
    return nil
})

Smart chocie! It seems that the "double type" function needs the receiver itself as the first argument. This perfectly solve my problem, thks:)