How to enable injection of test values.

Test.cs

class Test
{
	private string _logFilePath;

	public string LogFilePath
	{
		get
		{
			if (string.IsNullOrEmpty(_logFilePath))
			{
				_logFilePath = ConfigurationManager.AppSettings["LogFilePath"];
			}

			return _logFilePath;
		}

		set
		{
			_logFilePath = value;
		}
	}
}