public void ManualCreatedSUTWithMockedCollaborator()
{
//how we usually do it
var fixture = new Fixture();
var gateway = new Mock<EmailGateway>();
var sut = new EmailBuffer(gateway.Object);
sut.Add(fixture.Create<EmailMessage>());
sut.Send();
gateway.Verify(g=>g.Send(It.IsAny<EmailMessage>()));
}
public void AutoMockWithoutAnySetupByUsingACustomAttribute(
[Frozen] Mock<EmailGateway> gateway, //Frozen attribute freezes a type
//Note that the ORDER OF ARGUMENTS MATTERS HERE. if not frozen before a buffer object is created, gateway is not frozen yet!!!
EmailBuffer buffer,
EmailMessage message
)
{
buffer.Add(message);
buffer.Send();
gateway.Verify(g=>g.Send(It.IsAny<EmailMessage>()));
}