started to extend the additional arguments tests

Author: siywilliams

FluentCommandLineParser.Tests/Internals/CommandLineParserEngineMark2Tests.cs

@@ -121,6 +121,39 @@ class when_args_contains_single_switch : ParseTestContext
 				It should_set_the_parsed_raw_key_to_the_correct_value = () =>
 					result.ParsedOptions.First().RawKey.ShouldEqual("-b");
 			}
+
+			class when_args_contains_only_the_double_dash_option_prefix : ParseTestContext
+			{
+				Establish context = () => SetupArgs("--");
+
+				It should_return_no_parsed_options = () =>
+					result.ParsedOptions.ShouldBeEmpty();
+
+				It should_return_it_as_an_additional = () =>
+					result.AdditionalValues.ShouldContainOnly("--");
+			}
+
+			class when_args_contains_only_the_single_dash_option_prefix : ParseTestContext
+			{
+				Establish context = () => SetupArgs("-");
+
+				It should_return_no_parsed_options = () =>
+					result.ParsedOptions.ShouldBeEmpty();
+
+				It should_return_it_as_an_additional = () =>
+					result.AdditionalValues.ShouldContainOnly("-");
+			}
+
+			class when_args_contains_only_the_slash_option_prefix : ParseTestContext
+			{
+				Establish context = () => SetupArgs("/");
+
+				It should_return_no_parsed_options = () =>
+					result.ParsedOptions.ShouldBeEmpty();
+
+				It should_return_it_as_an_additional = () =>
+					result.AdditionalValues.ShouldContainOnly("/");
+			}
 		} 
 	}
 

FluentCommandLineParser/Internals/Parsing/CommandLineParserEngineMark2.cs

@@ -69,6 +69,7 @@ private void ParseGroupIntoOption(string rawKey, IEnumerable<string> optionGroup
 			}
 			else
 			{
+				_additionalOptionsFound.Add(rawKey);
 				_additionalOptionsFound.AddRange(optionGroup);
 			}
 		}
@@ -122,7 +123,9 @@ private static void TrimSuffix(ParsedOption parsedOption)
 		/// <returns><c>true</c> if <paramref name="arg"/> is a Option key; otherwise <c>false</c>.</returns>
 		static bool IsAKey(string arg)
 		{
-			return arg != null && SpecialCharacters.OptionPrefix.Any(arg.StartsWith);
+			return arg != null 
+				&& SpecialCharacters.OptionPrefix.Any(arg.StartsWith)
+				&& SpecialCharacters.OptionPrefix.Any(arg.Equals) == false;
 		}
 
 		/// <summary>