public async void Update_post_title_will_not_alter_slug()
{
// 1. user writes a post with title
var title = "A blog post title";
var dt = DateTimeOffset.Now;
var postId = 1;
// Very important to setup return null for Post or it'll go into infinite loop
postRepoMock.Setup(r => r.GetAsync(It.IsAny <string>(), dt.Year, dt.Month, dt.Day))
.Returns(Task.FromResult((Post)null));
// 2. user publishes the post
var slug = await blogPostService.GetBlogPostSlugAsync(title, dt, ECreateOrUpdate.Create, postId);
// 3. user goes back to update post title
// NOTE: at the point the existing slug is being passed in
// See BlogService.PrepPostAsync()
var theSlug = await blogPostService.GetBlogPostSlugAsync(slug, dt, ECreateOrUpdate.Update, postId);
Assert.Equal(theSlug, slug);
}