BlockSenderAsync() public method

Block the user from sending messages to the user that is logged in. OAuth authentication required.
/// Thrown when a null reference is passed to a method that does not accept it as a /// valid argument. /// Thrown when an error is found in a response from an Imgur endpoint. Thrown when an error is found in a response from a Mashape endpoint.
public BlockSenderAsync ( string username ) : Task
username string The sender that should be blocked.
return Task
        public async Task BlockSenderAsync_WithRecipientNull_ThrowsArgumentNullException()
        {
            var client = new ImgurClient("123", "1234", MockOAuth2Token);
            var endpoint = new ConversationEndpoint(client);

            var exception =
                await
                    Record.ExceptionAsync(
                        async () => await endpoint.BlockSenderAsync(null).ConfigureAwait(false))
                        .ConfigureAwait(false);
            Assert.NotNull(exception);
            Assert.IsType<ArgumentNullException>(exception);
        }
        public async Task BlockSenderAsync_True()
        {
            var mockUrl = "https://api.imgur.com/3/conversations/block/Bob";
            var mockResponse = new HttpResponseMessage(HttpStatusCode.OK)
            {
                Content = new StringContent(MockConversationEndpointResponses.BlockSender)
            };

            var client = new ImgurClient("123", "1234", MockOAuth2Token);
            var endpoint = new ConversationEndpoint(client,
                new HttpClient(new MockHttpMessageHandler(mockUrl, mockResponse)));
            var created = await endpoint.BlockSenderAsync("Bob").ConfigureAwait(false);

            Assert.True(created);
        }