Blog.Common.Utils.Helpers.ConfigurationHelper.GetAppSettings C# (CSharp) Method

        public string GetAppSettings(string key)
        {
            return ConfigurationManager.AppSettings.Get(key);
        }
    }

        public void ShouldReturnNullWhenKeyInAppSettingsIsMissing()
        {
            var configurationHelper = new ConfigurationHelper();
            var result = configurationHelper.GetAppSettings("bar");

            Assert.IsNull(result);
        }