gistfile1.txt

Should I unit test the repository and the controller? I probably only need to verify that the already-tested 
repository has been called into.

Should I test All_ReturnsAll and All_OrdersByPublish date or just the former?

    [Test]
    public void Create()
    {
        var databaseSet = new Mock<DbSet<Post>>();
        var databaseContext = new Mock<DatabaseContext>();
        databaseContext.Setup(context => context.Posts).Returns(databaseSet.Object);

        var actual = new Post { Slug = "AAA" };
        var repository = new PostsRepository(databaseContext.Object);
        repository.Create(actual);
        databaseSet.Verify(set => set.Add(It.IsAny<Post>()), Times.Once);
        Assert.AreNotEqual(DateTime.MinValue, actual.PublishedAt);
    }