public void ReturnACollectionOfTags()
{
// Arrange
var tagServiceMock = new Mock <ITagService>();
ITagsHelper tagsHelper = new TagsHelper(tagServiceMock.Object);
// Act
ICollection <Tag> result = tagsHelper.CreateTags(null);
// Assert
CollectionAssert.AllItemsAreInstancesOfType(result, typeof(Tag));
}