diff --git a/tests/CommandLine.Tests/Unit/UnParserExtensionsTests.cs b/tests/CommandLine.Tests/Unit/UnParserExtensionsTests.cs
index 45850cb1..50cb3290 100644
--- a/tests/CommandLine.Tests/Unit/UnParserExtensionsTests.cs
+++ b/tests/CommandLine.Tests/Unit/UnParserExtensionsTests.cs
@@ -24,6 +24,16 @@ public static void UnParsing_instance_returns_command_line(Simple_Options option
                 .Should().BeEquivalentTo(result);
         }
 
+        [Theory]
+        [MemberData(nameof(UnParseData))]
+        public static void UnParsing_instance_with_splitArgs_returns_same_option_class(Simple_Options options, string result)
+        {
+           new Parser()
+            .FormatCommandLineArgs(options)
+            .Should().BeEquivalentTo(result.SplitArgs());
+             
+        }
+
         [Theory]
         [MemberData(nameof(UnParseFileDirectoryData))]
         public static void UnParsing_instance_returns_command_line_for_file_directory_paths(Options_With_FileDirectoryInfo options, string result)
@@ -33,6 +43,14 @@ public static void UnParsing_instance_returns_command_line_for_file_directory_pa
                 .Should().BeEquivalentTo(result);
         }
 
+        [Theory]
+        [MemberData(nameof(UnParseFileDirectoryData))]
+        public static void UnParsing_instance_by_splitArgs_returns_command_line_for_file_directory_paths(Options_With_FileDirectoryInfo options, string result)
+        {
+            new Parser()
+                .FormatCommandLineArgs(options)
+                .Should().BeEquivalentTo(result.SplitArgs());
+        }
         [Theory]
         [MemberData(nameof(UnParseDataVerbs))]
         public static void UnParsing_instance_returns_command_line_for_verbs(Add_Verb verb, string result)
@@ -42,6 +60,15 @@ public static void UnParsing_instance_returns_command_line_for_verbs(Add_Verb ve
                 .Should().BeEquivalentTo(result);
         }
 
+        [Theory]
+        [MemberData(nameof(UnParseDataVerbs))]
+        public static void UnParsing_instance_to_splitArgs_returns_command_line_for_verbs(Add_Verb verb, string result)
+        {
+            new Parser()
+                .FormatCommandLineArgs(verb)
+                .Should().BeEquivalentTo(result.SplitArgs());
+        }
+
         [Theory]
         [MemberData(nameof(UnParseDataImmutable))]
         public static void UnParsing_immutable_instance_returns_command_line(Immutable_Simple_Options options, string result)