public void When_AppSettingIsPassed_SetAppSetting_Should_UpdateConfigXml() { LoadWebConfigAsXmlDocument(); var expected = new KeyValuePair <string, string>("BP_AppSettings_Key1", "TestValue"); _writer.SetAppSetting(expected.Key, expected.Value); var actual = _writer.GetAppSetting(expected.Key); actual.Should().NotBeNullOrEmpty(); expected.Value.Should().BeEquivalentTo(actual); }