Blog.TooDeeplyTestFixture.cs

[Fact]
public void Delete_WithMessageId_ShouldDeleteMessage()
{
    // Arrange
    var messageId = Guid.NewGuid().ToString();
    var repo = new Mock<IMessageRepository>();
    repo.Setup(r => r.DeleteMessage(messageId)).Returns(1);

    var cache = new Mock<IMessageCache>();
    cache.Setup(c => c.Get(messageId)).Returns(Cache.NotInCache);

    var notifier = new Mock<IMessageNotifier>();
    notifier.Setup(n => n.NewMessage(messageId))
            .Returns(new NotifyResult(NotifyType.Notified))

    var service = new MessageService(repo.Object, cache.Object, notifier.Object);

    // Act
    service.DeleteMessageById(messageId);

    // Assert
    repo.Verify(r => r.DeleteMessage(messageId), Times.Once);
}