public async Task UpdateAsync_ips()
        {
            // Arrange
            var username = "******";
            var disabled = default(Parameter <bool>);
            var ips      = new[] { "1.1.1.1", "2.2.2.2" };

            var mockHttp = new MockHttpMessageHandler();

            mockHttp.Expect(new HttpMethod("PUT"), Utils.GetSendGridApiUri(ENDPOINT, username, "ips")).Respond("application/json", MULTIPLE_IPS_JSON);

            var client   = Utils.GetFluentClient(mockHttp);
            var subusers = new Subusers(client);

            // Act
            await subusers.UpdateAsync(username, disabled, ips, CancellationToken.None).ConfigureAwait(false);

            // Assert
            mockHttp.VerifyNoOutstandingExpectation();
            mockHttp.VerifyNoOutstandingRequest();
        }
        public async Task UpdateAsync_disabled()
        {
            // Arrange
            var username = "******";
            var disabled = true;
            var ips      = default(Parameter <IEnumerable <string> >);

            var mockHttp = new MockHttpMessageHandler();

            mockHttp.Expect(new HttpMethod("PATCH"), Utils.GetSendGridApiUri(ENDPOINT, username)).Respond(HttpStatusCode.NoContent);

            var client   = Utils.GetFluentClient(mockHttp);
            var subusers = new Subusers(client);

            // Act
            await subusers.UpdateAsync(username, disabled, ips, CancellationToken.None).ConfigureAwait(false);

            // Assert
            mockHttp.VerifyNoOutstandingExpectation();
            mockHttp.VerifyNoOutstandingRequest();
        }