public async Task TestGetExistingBlogPost()
        {
            var options    = DbCreator.CreateInMemoryDatabase();
            var loggerMock = new Mock <ILogger <BlogPostsController> >();
            var mapper     = TestMapper.CreateMapper();

            FullBlogPost post;

            using (var ctx = new BlogsDataBaseContext(options))
            {
                var controller = new BlogPostsController(ctx, mapper, loggerMock.Object);

                // act
                var result = await controller.GetBlogPost(1);

                post = result.Value;
            }

            // check
            Assert.NotNull(post);
            Assert.Equal(DbCreator.postText, post.BodyText);
            Assert.Equal(DbCreator.postHeader, post.HeaderText);
        }