public void ShouldReturnAllPostsWhenNoDateRangeIsEntered()
{
_postDataAccess = new Mock<IPostDataAccess>();
_postDataAccess.Setup(x => x.GetPostsByDateRange(It.IsAny<DateTime>(), It.IsAny<DateTime>()))
.Returns(Mother.PostsWithoutTagsOrComments);
var sut = new PostBLL(_postDataAccess.Object);
var posts = sut.GetPostsByDateRange(null, null);
Assert.Equal(Mother.PostsWithoutTagsOrComments.Count(), posts.Count());
}