refactor: add test to ensure, that GetTempPath ends with a director…

…y separator (#675)

Add test to ensure, that `GetTempPath` ends with a directory separator

Tests/Testably.Abstractions.Tests/FileSystem/Path/GetTempPathTests.cs

@@ -25,6 +25,16 @@ public void GetTempPath_MacOs_ShouldBeTmp()
 		result.Should().Match("/var/folders/??/*/T/");
 	}
 
+	[SkippableFact]
+	public void GetTempPath_ShouldEndWithDirectorySeparator()
+	{
+		string directorySeparator = FileSystem.Path.DirectorySeparatorChar.ToString();
+
+		string result = FileSystem.Path.GetTempPath();
+
+		result.Should().EndWith(directorySeparator);
+	}
+
 	[SkippableFact]
 	public void GetTempPath_ShouldRemainTheSame()
 	{