public void CheckBothStringsAndThrowException_ParameterIsNullOrEmpty_ThrowsArgumentNullException(string str1, string str2)
 {
     Assert.Throws <ArgumentNullException>(() => ThrowingExceptions.CheckBothStringsAndThrowException(str1, str2), "ThrowingExceptions.CheckBothStringsAndThrowException should throw an ArgumentNullException.");
 }
 public string CheckBothStringsAndThrowException_ParameterIsNotNullOrEmpty_ReturnWithoutException(string str1, string str2)
 {
     return(ThrowingExceptions.CheckBothStringsAndThrowException(str1, str2));
 }