Unexpected call when interface is parameter about testify HOT 4 CLOSED

I tried reproducing based on your code was unable to. The following test passes for me.

type Email interface{}

type Mailer interface {
	Send(email Email, receiver string)
}

type MockMailer struct {
	mock.Mock
}

func (m *MockMailer) Send(email Email, receiver string) error {
	args := m.Called(email, receiver)
	return args.Error(0)
}

func TestMailer(t *testing.T) {
	mailer := new(MockMailer)
	mailer.On("Send", mock.Anything, mock.Anything).Return(nil)

	err := mailer.Send("hello", "world")
	assert.NoError(t, err)
}

from testify.

You've most likely either missed this line from your test:

mailer.On("Send", mock.Anything, mock.Anything).Return(nil)

or misspelled "Send", or your test was using a different mailer mock instance than you expected.

Can you make a minimal compilable example that fails?

from testify.

I confirm what @tscales said, i can't reproduce the issue either. Here is a working snippet

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Please comment again, or start a discussion (tab up top), if you still have this problem.

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