public async Task Add_Tag_Suggestion()
{
var mockSet = new Mock <DbSet <TagSuggestion> >();
var mockContext = new Mock <ApplicationDbContext>();
mockContext.Setup(m => m.TagSuggestions).Returns(mockSet.Object);
ProfileService service = new ProfileService(mockContext.Object, new EmailService());
int changes = await service.AddTagSuggestionAsync(1, 1, Guid.NewGuid().ToString());
mockSet.Verify(m => m.Add(It.IsAny <TagSuggestion>()), Times.Once());
mockContext.Verify(m => m.SaveChangesAsync(), Times.Once());
}