Mock object come from with previous data. Can we format previous mock data before calling it

[ahmetremziata]

If there are two tests and tests are calling same mock, second test mock data come with first test data.

I show example like this.

func TestMethodA (*testing.T) {
    //Given
        var data1 := "data1"
    mockCacheService.On("GetData").Return(data1)

    //When
    resp, err := service.GetData(req)

    //Then
    assert.Nil(t, err)
    assertion.NotNil(t, resp)
}

func TestMethodB (*testing.T) {
    //Given
        var data2 := "data2"
    mockCacheService.On("GetData").Return(data2)

    //When
    resp, err := service.GetData(req)

    //Then
    assert.Nil(t, err)
    assertion.NotNil(t, resp)
}

You see that there are two tests. In second test "GetData" method come with first test data (data1). Note: If we run tests seperetaly there ara no error, but if we run tests together problem has occured.

[dolmen]

Please make a reproducible example running on go.dev/play. Here is a template: https://go.dev/play/p/AsRNcxCRdWx