Field Type Matcher

[denizgursoy]

Is it possible to add a matcher per type and use it? Whenever I use decimal.Decimal from github.com/shopspring/decimal as a field in in one of my structs, my mocks fail because precision in the type.

type MyType struct {
        Field1 string
	Field2 string
	Field3 decimal.Decimal
}

func Test_MyType(t *testing.T) {
	type MyType struct {
		Field1 string
		Field2 string
		Field3 decimal.Decimal
	}

	controller := gomock.NewController(t)
	client := NewMock(controller)
	client.EXPECT().MyFunction(gomock.Any(), MyType{}).Return().Times(1) // this fails
}

Is there a way to match these types in gomock?

If no, is there a way to extend gomock to match by specfic type in this case it is decimal.Decimal instead of writing a matcher for whole MyType struct

As a POC I did something like this:

func Test_MyType(t *testing.T) {
	type MyType struct {
		Field1 string
		Field2 string
		Field3 decimal.Decimal
	}

	decimalMatcher := DecimalMatcher{}
	controller := gomock.NewController(t, gomock.WithFieldMatcher[decimal.Decimal](decimalMatcher))
	client := NewMock(controller)
	client.EXPECT().MyFunction(gomock.Any(), MyType{}).Return().Times(1)
	fmt.Println(client)
}

type DecimalMatcher struct {
}

func (d DecimalMatcher) Matches(x any) bool {
	return true
}

func (d DecimalMatcher) String() string {
	return "foo"
}

This is for extending go mock whenever it sees a ``decimal.Decimal` type, it uses the custom matcher given instead of writing a new matcher for whole struct