public async Task AssociateTags()
{
var photo = _fixture.Create <Photo>();
var tag = _fixture.Create <Tag>();
var tags = _fixture.CreateMany <Tag>(3);
_tagData.Setup(m => m.AssociatePhotoTag(It.IsAny <int>(), It.IsAny <int>()));
_tagData.Setup(m => m.SaveTag(It.IsAny <Tag>()))
.ReturnsAsync(tag);
await _photoService.AssociateTags(photo, tags.Select(t => t.TagName).ToArray());
_tagData.Verify(m => m.AssociatePhotoTag(It.IsAny <int>(), It.IsAny <int>()),
Times.Exactly(3));
}