Fix/issue #579 (#580)

* Added tests to verify issue #579

* Unparsing TimeSpan without quotes

Author: gsscoder

Diff for: src/CommandLine/UnParserExtensions.cs

@@ -204,7 +204,7 @@ private static string FormatValue(Specification spec, object value)
 
         private static object FormatWithQuotesIfString(object value)
         {
-            if (value is DateTime || value is TimeSpan || value is DateTimeOffset) return $"\"{value}\"";
+            if (value is DateTime || value is DateTimeOffset) return $"\"{value}\"";
             Func<string, string> doubQt = v
                 => v.Contains("\"") ? v.Replace("\"", "\\\"") : v;
 

Diff for: tests/CommandLine.Tests/Unit/Core/InstanceBuilderTests.cs

@@ -1086,6 +1086,22 @@ public void Parse_TimeSpan()
             expectedResult.Should().BeEquivalentTo(((Parsed<Options_With_TimeSpan>)result).Value);
         }
 
+        #region Issue 579
+        [Fact]
+        public void Should_not_parse_quoted_TimeSpan()
+        {
+            // Exercize system 
+            var result = InvokeBuild<Options_With_TimeSpan>(new[] { "--duration=\"00:42:00\"" });
+
+            var outcome = result as NotParsed<Options_With_TimeSpan>;
+
+            // Verify outcome
+            outcome.Should().NotBeNull();
+            outcome.Errors.Should().NotBeNullOrEmpty()
+                .And.HaveCount(1)
+                .And.OnlyContain(e => e.GetType().Equals(typeof(BadFormatConversionError)));
+        }
+        #endregion
 
         [Fact]
         public void OptionClass_IsImmutable_HasNoCtor()

Diff for: tests/CommandLine.Tests/Unit/UnParserExtensionsTests.cs

@@ -106,6 +106,17 @@ public static void UnParsing_instance_with_dash_in_value_and_dashdash_disabled_r
                 .Should().BeEquivalentTo("-something with dash");
         }
 
+        #region Issue 579
+        [Fact]
+        public static void UnParsing_instance_with_TimeSpan_returns_the_value_unquoted_in_command_line()
+        {
+            var options = new Options_With_TimeSpan { Duration = TimeSpan.FromMinutes(1) };
+            new Parser()
+                .FormatCommandLine(options)
+                .Should().Be("--duration 00:01:00");
+        }
+        #endregion
+
         #region PR 550
 
         [Fact]
@@ -175,7 +186,7 @@ public static void UnParsing_instance_with_timespan()
             var options = new Options_TimeSpan { Start = ts };
             var result = new Parser()
                 .FormatCommandLine(options)
-                .Should().BeEquivalentTo("--start \"01:02:03\"");
+                .Should().BeEquivalentTo("--start 01:02:03"); //changed for issue 579
         }
 
         [Theory]