public void And_IsConnectionString_is_true_then_setting_is_read_from_connection_strings() { var settings = new AppSettings(SimpleConfig.AbsolutePathToConfigFile); var mySettings = new SettingsWithConnectionString(); settings.WriteInto(mySettings); var value = settings.GetConnectionString("MyDatabase"); Assert.AreEqual(value, mySettings.DatabaseConnectionString); Assert.AreEqual("A", mySettings.OptionalConnectionString); }