Tests For Remove Relative Segments (dotnet/corefx#27844)

Commit migrated from https://github.com/dotnet/corefx/commit/ed489f38e8a5ca675df63c901b5096f67945f823

src/libraries/Common/tests/Tests/System/IO/PathInternal.Tests.cs

@@ -2,8 +2,8 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-using System;
 using System.IO;
+using System.Text;
 using Xunit;
 
 namespace Tests.System.IO
@@ -64,5 +64,345 @@ public void GetCommonPathLength(string first, string second, bool ignoreCase, in
         {
             Assert.Equal(expected, PathInternal.GetCommonPathLength(first, second, ignoreCase));
         }
+
+        public static TheoryData<string, int, string> RemoveRelativeSegmentsData => new TheoryData<string, int, string>
+        {
+            { @"C:\git\corefx", 2, @"C:\git\corefx"},
+            { @"C:\\git\corefx", 2, @"C:\git\corefx"},
+            { @"C:\git\\corefx", 2, @"C:\git\corefx"},
+            { @"C:\git\.\corefx\.\\", 2, @"C:\git\corefx\"},
+            { @"C:\git\corefx", 2, @"C:\git\corefx"},
+            { @"C:\git\..\corefx", 2, @"C:\corefx"},
+            { @"C:\git\corefx\..\", 2, @"C:\git\"},
+            { @"C:\git\corefx\..\..\..\", 2, @"C:\"},
+            { @"C:\git\corefx\..\..\.\", 2, @"C:\"},
+            { @"C:\git\..\.\corefx\temp\..", 2, @"C:\corefx"},
+            { @"C:\git\..\\\.\..\corefx", 2, @"C:\corefx"},
+            { @"C:\git\corefx\", 2, @"C:\git\corefx\"},
+            { @"C:\git\temp\..\corefx\", 2, @"C:\git\corefx\"},
+
+            { @"C:\.", 3, @"C:\"},
+            { @"C:\..", 3, @"C:\"},
+            { @"C:\..\..", 3, @"C:\"},
+            { @"C:\.", 2, @"C:"},
+            { @"C:\..", 2, @"C:"},
+            { @"C:\..\..", 2, @"C:"},
+            { @"C:A\.", 2, @"C:A"},
+            { @"C:A\..", 2, @"C:"},
+            { @"C:A\..\..", 2, @"C:"},
+            { @"C:A\..\..\..", 2, @"C:"},
+
+            { @"C:\tmp\home", 3, @"C:\tmp\home" },
+            { @"C:\tmp\..", 3, @"C:\" },
+            { @"C:\tmp\home\..\.\.\", 3, @"C:\tmp\" },
+            { @"C:\tmp\..\..\..\", 3, @"C:\" },
+            { @"C:\tmp\\home", 3, @"C:\tmp\home" },
+            { @"C:\.\tmp\\home", 3, @"C:\tmp\home" },
+            { @"C:\..\tmp\home", 3, @"C:\tmp\home" },
+            { @"C:\..\..\..\tmp\.\home", 3, @"C:\tmp\home" },
+            { @"C:\\tmp\\\home", 3, @"C:\tmp\home" },
+            { @"C:\tmp\home\git\.\..\.\git\corefx\..\", 3, @"C:\tmp\home\git\" },
+            { @"C:\.\tmp\home", 3, @"C:\tmp\home" },
+
+            { @"C:\tmp\home", 6, @"C:\tmp\home" },
+            { @"C:\tmp\..", 6, @"C:\tmp" },
+            { @"C:\tmp\home\..\.\.\", 5, @"C:\tmp\" },
+            { @"C:\tmp\..\..\..\", 6, @"C:\tmp\" },
+            { @"C:\tmp\\home", 5, @"C:\tmp\home" },
+            { @"C:\.\tmp\\home", 4, @"C:\.\tmp\home" },
+            { @"C:\..\tmp\home", 5, @"C:\..\tmp\home" },
+            { @"C:\..\..\..\tmp\.\home", 6, @"C:\..\tmp\home" },
+            { @"C:\\tmp\\\home", 7, @"C:\\tmp\home" },
+            { @"C:\tmp\home\git\.\..\.\git\corefx\..\", 7, @"C:\tmp\home\git\" },
+            { @"C:\.\tmp\home", 5, @"C:\.\tmp\home" },
+
+            { @"C:\tmp\..", 2, @"C:\" },
+            { @"C:\tmp\home\..\..\.\", 2, @"C:\" },
+            { @"C:\tmp\..\..\..\", 2, @"C:\" },
+            { @"C:\tmp\\home", 2, @"C:\tmp\home" },
+            { @"C:\.\tmp\\home", 2, @"C:\tmp\home" },
+            { @"C:\..\tmp\home", 2, @"C:\tmp\home" },
+            { @"C:\..\..\..\tmp\.\home", 2, @"C:\tmp\home" },
+            { @"C:\\tmp\\\home", 2, @"C:\tmp\home" },
+            { @"C:\tmp\home\git\.\..\.\git\corefx\..\", 2, @"C:\tmp\home\git\" },
+            { @"C:\.\tmp\home", 2, @"C:\tmp\home" },
+
+            { @"C:\tmp\..\..\", 10, @"C:\tmp\..\" },
+            { @"C:\tmp\home\..\.\.\", 12, @"C:\tmp\home\" },
+            { @"C:\tmp\..\..\..\", 10, @"C:\tmp\..\" },
+            { @"C:\tmp\\home\..\.\\", 13, @"C:\tmp\\home\" },
+            { @"C:\.\tmp\\home\git\git", 9, @"C:\.\tmp\home\git\git" },
+            { @"C:\..\tmp\.\home", 10, @"C:\..\tmp\home" },
+            { @"C:\..\..\..\tmp\.\home", 10, @"C:\..\..\..\tmp\home" },
+            { @"C:\\tmp\\\home\..", 7, @"C:\\tmp\" },
+            { @"C:\tmp\home\git\.\..\.\git\corefx\..\", 18, @"C:\tmp\home\git\.\git\" },
+            { @"C:\.\tmp\home\.\.\", 9, @"C:\.\tmp\home\" },
+        };
+
+        public static TheoryData<string, int, string> RemoveRelativeSegmentsFirstRelativeSegment => new TheoryData<string, int, string>
+        {
+            { @"C:\\git\corefx", 2, @"C:\git\corefx"},
+            { @"C:\.\git\corefx", 2, @"C:\git\corefx"},
+            { @"C:\\.\git\.\corefx", 2, @"C:\git\corefx"},
+            { @"C:\..\git\corefx", 2, @"C:\git\corefx"},
+            { @"C:\.\git\..\corefx", 2, @"C:\corefx"},
+            { @"C:\.\git\corefx\..\", 2, @"C:\git\"},
+            { @"C:\.\git\corefx\..\..\..\", 2, @"C:\"},
+            { @"C:\.\git\corefx\..\..\.\", 2, @"C:\"},
+            { @"C:\.\git\..\.\corefx\temp\..", 2, @"C:\corefx"},
+            { @"C:\.\git\..\\\.\..\corefx", 2, @"C:\corefx"},
+            { @"C:\.\git\corefx\", 2, @"C:\git\corefx\"},
+            { @"C:\.\git\temp\..\corefx\", 2, @"C:\git\corefx\"},
+            { @"C:\\..\..", 3, @"C:\"}
+        };
+
+        public static TheoryData<string, int, string> RemoveRelativeSegmentsSkipAboveRoot => new TheoryData<string, int, string>
+        {
+            { @"C:\temp\..\" , 7, @"C:\temp\" },
+            { @"C:\temp\..\git" , 7, @"C:\temp\git" },
+            { @"C:\temp\..\git" , 8, @"C:\temp\git" },
+            { @"C:\temp\..\.\" , 8, @"C:\temp\" },
+            { @"C:\temp\..\" , 9, @"C:\temp\..\" },
+            { @"C:\temp\..\git" , 9, @"C:\temp\..\git" },
+            { @"C:\git\..\temp\..\" , 15, @"C:\git\..\temp\" },
+            { @"C:\\\.\..\..\temp\..\" , 17, @"C:\\\.\..\..\temp\" },
+        };
+
+        public static TheoryData<string, int, string> RemoveRelativeSegmentsFirstRelativeSegmentRoot => new TheoryData<string, int, string>
+        {
+            { @"C:\\git\corefx", 3, @"C:\git\corefx"},
+            { @"C:\.\git\corefx", 3, @"C:\git\corefx"},
+            { @"C:\\.\git\.\corefx", 3, @"C:\git\corefx"},
+            { @"C:\..\git\corefx", 3, @"C:\git\corefx"},
+            { @"C:\.\git\..\corefx", 3, @"C:\corefx"},
+            { @"C:\.\git\corefx\..\", 3, @"C:\git\"},
+            { @"C:\.\git\corefx\..\..\..\", 3, @"C:\"},
+            { @"C:\.\git\corefx\..\..\.\", 3, @"C:\"},
+            { @"C:\.\git\..\.\corefx\temp\..", 3, @"C:\corefx"},
+            { @"C:\.\git\..\\\.\..\corefx", 3, @"C:\corefx"},
+            { @"C:\.\git\corefx\", 3, @"C:\git\corefx\"},
+            { @"C:\.\git\temp\..\corefx\", 3, @"C:\git\corefx\"},
+        };
+
+        [Theory,
+            MemberData(nameof(RemoveRelativeSegmentsData)),
+            MemberData(nameof(RemoveRelativeSegmentsFirstRelativeSegment)),
+            MemberData(nameof(RemoveRelativeSegmentsFirstRelativeSegmentRoot)),
+            MemberData(nameof(RemoveRelativeSegmentsSkipAboveRoot))]
+        [PlatformSpecific(TestPlatforms.Windows)]
+        public void RemoveRelativeSegmentsTest(string path, int skip, string expected)
+        {
+            Assert.Equal(expected, PathInternal.RemoveRelativeSegments(path, skip));
+            Assert.Equal(@"\\.\" + expected, PathInternal.RemoveRelativeSegments(@"\\.\" + path, skip + 4));
+            Assert.Equal(@"\\?\" + expected, PathInternal.RemoveRelativeSegments(@"\\?\" + path, skip + 4));
+        }
+
+        public static TheoryData<string, int, string> RemoveRelativeSegmentsUncData => new TheoryData<string, int, string>
+        {
+            { @"Server\Share\git\corefx", 12, @"Server\Share\git\corefx"},
+            { @"Server\Share\\git\corefx", 12, @"Server\Share\git\corefx"},
+            { @"Server\Share\git\\corefx", 12, @"Server\Share\git\corefx"},
+            { @"Server\Share\git\.\corefx\.\\", 12, @"Server\Share\git\corefx\"},
+            { @"Server\Share\git\corefx", 12, @"Server\Share\git\corefx"},
+            { @"Server\Share\git\..\corefx", 12, @"Server\Share\corefx"},
+            { @"Server\Share\git\corefx\..\", 12, @"Server\Share\git\"},
+            { @"Server\Share\git\corefx\..\..\..\", 12, @"Server\Share\"},
+            { @"Server\Share\git\corefx\..\..\.\", 12, @"Server\Share\"},
+            { @"Server\Share\git\..\.\corefx\temp\..", 12, @"Server\Share\corefx"},
+            { @"Server\Share\git\..\\\.\..\corefx", 12, @"Server\Share\corefx"},
+            { @"Server\Share\git\corefx\", 12, @"Server\Share\git\corefx\"},
+            { @"Server\Share\git\temp\..\corefx\", 12, @"Server\Share\git\corefx\"},
+        };
+
+        [Theory,
+            MemberData(nameof(RemoveRelativeSegmentsUncData))]
+        [PlatformSpecific(TestPlatforms.Windows)]
+        public void RemoveRelativeSegmentsUncTest(string path, int skip, string expected)
+        {
+            Assert.Equal(@"\\" + expected, PathInternal.RemoveRelativeSegments(@"\\" + path, skip + 2));
+            Assert.Equal(@"\\.\UNC\" + expected, PathInternal.RemoveRelativeSegments(@"\\.\UNC\" + path, skip + 8));
+            Assert.Equal(@"\\?\UNC\" + expected, PathInternal.RemoveRelativeSegments(@"\\?\UNC\" + path, skip + 8));
+        }
+
+        public static TheoryData<string, int, string> RemoveRelativeSegmentsDeviceData => new TheoryData<string, int, string>
+        {
+            { @"\\.\git\corefx", 7, @"\\.\git\corefx"},
+            { @"\\.\git\corefx", 7, @"\\.\git\corefx"},
+            { @"\\.\git\\corefx", 7, @"\\.\git\corefx"},
+            { @"\\.\git\.\corefx\.\\", 7, @"\\.\git\corefx\"},
+            { @"\\.\git\corefx", 7, @"\\.\git\corefx"},
+            { @"\\.\git\..\corefx", 7, @"\\.\git\corefx"},
+            { @"\\.\git\corefx\..\", 7, @"\\.\git\"},
+            { @"\\.\git\corefx\..\..\..\", 7, @"\\.\git\"},
+            { @"\\.\git\corefx\..\..\.\", 7, @"\\.\git\"},
+            { @"\\.\git\..\.\corefx\temp\..", 7, @"\\.\git\corefx"},
+            { @"\\.\git\..\\\.\..\corefx", 7, @"\\.\git\corefx"},
+            { @"\\.\git\corefx\", 7, @"\\.\git\corefx\"},
+            { @"\\.\git\temp\..\corefx\", 7, @"\\.\git\corefx\"},
+
+            { @"\\.\.\corefx", 5, @"\\.\.\corefx"},
+            { @"\\.\.\corefx", 5, @"\\.\.\corefx"},
+            { @"\\.\.\\corefx", 5, @"\\.\.\corefx"},
+            { @"\\.\.\.\corefx\.\\", 5, @"\\.\.\corefx\"},
+            { @"\\.\.\corefx", 5, @"\\.\.\corefx"},
+            { @"\\.\.\..\corefx", 5, @"\\.\.\corefx"},
+            { @"\\.\.\corefx\..\", 5, @"\\.\.\"},
+            { @"\\.\.\corefx\..\..\..\", 5, @"\\.\.\"},
+            { @"\\.\.\corefx\..\..\.\", 5, @"\\.\.\"},
+            { @"\\.\.\..\.\corefx\temp\..", 5, @"\\.\.\corefx"},
+            { @"\\.\.\..\\\.\..\corefx", 5, @"\\.\.\corefx"},
+            { @"\\.\.\corefx\", 5, @"\\.\.\corefx\"},
+            { @"\\.\.\temp\..\corefx\", 5, @"\\.\.\corefx\"},
+
+            { @"\\.\..\corefx", 6, @"\\.\..\corefx"},
+            { @"\\.\..\corefx", 6, @"\\.\..\corefx"},
+            { @"\\.\..\\corefx", 6, @"\\.\..\corefx"},
+            { @"\\.\..\.\corefx\.\\", 6, @"\\.\..\corefx\"},
+            { @"\\.\..\corefx", 6, @"\\.\..\corefx"},
+            { @"\\.\..\..\corefx", 6, @"\\.\..\corefx"},
+            { @"\\.\..\corefx\..\", 6, @"\\.\..\"},
+            { @"\\.\..\corefx\..\..\..\", 6, @"\\.\..\"},
+            { @"\\.\..\corefx\..\..\.\", 6, @"\\.\..\"},
+            { @"\\.\..\..\.\corefx\temp\..", 6, @"\\.\..\corefx"},
+            { @"\\.\..\..\\\.\..\corefx", 6, @"\\.\..\corefx"},
+            { @"\\.\..\corefx\", 6, @"\\.\..\corefx\"},
+            { @"\\.\..\temp\..\corefx\", 6, @"\\.\..\corefx\"},
+
+            { @"\\.\\corefx", 4, @"\\.\corefx"},
+            { @"\\.\\corefx", 4, @"\\.\corefx"},
+            { @"\\.\\\corefx", 4, @"\\.\corefx"},
+            { @"\\.\\.\corefx\.\\", 4, @"\\.\corefx\"},
+            { @"\\.\\corefx", 4, @"\\.\corefx"},
+            { @"\\.\\..\corefx", 4, @"\\.\corefx"},
+            { @"\\.\\corefx\..\", 4, @"\\.\"},
+            { @"\\.\\corefx\..\..\..\", 4, @"\\.\"},
+            { @"\\.\\corefx\..\..\.\", 4, @"\\.\"},
+            { @"\\.\\..\.\corefx\temp\..", 4, @"\\.\corefx"},
+            { @"\\.\\..\\\.\..\corefx", 4, @"\\.\corefx"},
+            { @"\\.\\corefx\", 4, @"\\.\corefx\"},
+            { @"\\.\\temp\..\corefx\", 4, @"\\.\corefx\"},
+        };
+
+        public static TheoryData<string, int, string> RemoveRelativeSegmentsDeviceRootData => new TheoryData<string, int, string>
+        {
+            { @"\\.\git\corefx", 8, @"\\.\git\corefx"},
+            { @"\\.\git\corefx", 8, @"\\.\git\corefx"},
+            { @"\\.\git\\corefx", 8, @"\\.\git\corefx"},
+            { @"\\.\git\.\corefx\.\\", 8, @"\\.\git\corefx\"},
+            { @"\\.\git\corefx", 8, @"\\.\git\corefx"},
+            { @"\\.\git\..\corefx", 8, @"\\.\git\corefx"},
+            { @"\\.\git\corefx\..\", 8, @"\\.\git\"},
+            { @"\\.\git\corefx\..\..\..\", 8, @"\\.\git\"},
+            { @"\\.\git\corefx\..\..\.\", 8, @"\\.\git\"},
+            { @"\\.\git\..\.\corefx\temp\..", 8, @"\\.\git\corefx"},
+            { @"\\.\git\..\\\.\..\corefx", 8, @"\\.\git\corefx"},
+            { @"\\.\git\corefx\", 8, @"\\.\git\corefx\"},
+            { @"\\.\git\temp\..\corefx\", 8, @"\\.\git\corefx\"},
+
+            { @"\\.\.\corefx", 6, @"\\.\.\corefx"},
+            { @"\\.\.\corefx", 6, @"\\.\.\corefx"},
+            { @"\\.\.\\corefx", 6, @"\\.\.\corefx"},
+            { @"\\.\.\.\corefx\.\\", 6, @"\\.\.\corefx\"},
+            { @"\\.\.\corefx", 6, @"\\.\.\corefx"},
+            { @"\\.\.\..\corefx", 6, @"\\.\.\corefx"},
+            { @"\\.\.\corefx\..\", 6, @"\\.\.\"},
+            { @"\\.\.\corefx\..\..\..\", 6, @"\\.\.\"},
+            { @"\\.\.\corefx\..\..\.\", 6, @"\\.\.\"},
+            { @"\\.\.\..\.\corefx\temp\..", 6, @"\\.\.\corefx"},
+            { @"\\.\.\..\\\.\..\corefx", 6, @"\\.\.\corefx"},
+            { @"\\.\.\corefx\", 6, @"\\.\.\corefx\"},
+            { @"\\.\.\temp\..\corefx\", 6, @"\\.\.\corefx\"},
+
+            { @"\\.\..\corefx", 7, @"\\.\..\corefx"},
+            { @"\\.\..\corefx", 7, @"\\.\..\corefx"},
+            { @"\\.\..\\corefx", 7, @"\\.\..\corefx"},
+            { @"\\.\..\.\corefx\.\\", 7, @"\\.\..\corefx\"},
+            { @"\\.\..\corefx", 7, @"\\.\..\corefx"},
+            { @"\\.\..\..\corefx", 7, @"\\.\..\corefx"},
+            { @"\\.\..\corefx\..\", 7, @"\\.\..\"},
+            { @"\\.\..\corefx\..\..\..\", 7, @"\\.\..\"},
+            { @"\\.\..\corefx\..\..\.\", 7, @"\\.\..\"},
+            { @"\\.\..\..\.\corefx\temp\..", 7, @"\\.\..\corefx"},
+            { @"\\.\..\..\\\.\..\corefx", 7, @"\\.\..\corefx"},
+            { @"\\.\..\corefx\", 7, @"\\.\..\corefx\"},
+            { @"\\.\..\temp\..\corefx\", 7, @"\\.\..\corefx\"},
+
+            { @"\\.\\corefx", 5, @"\\.\\corefx"},
+            { @"\\.\\corefx", 5, @"\\.\\corefx"},
+            { @"\\.\\\corefx", 5, @"\\.\\corefx"},
+            { @"\\.\\.\corefx\.\\", 5, @"\\.\\corefx\"},
+            { @"\\.\\corefx", 5, @"\\.\\corefx"},
+            { @"\\.\\..\corefx", 5, @"\\.\\corefx"},
+            { @"\\.\\corefx\..\", 5, @"\\.\\"},
+            { @"\\.\\corefx\..\..\..\", 5, @"\\.\\"},
+            { @"\\.\\corefx\..\..\.\", 5, @"\\.\\"},
+            { @"\\.\\..\.\corefx\temp\..", 5, @"\\.\\corefx"},
+            { @"\\.\\..\\\.\..\corefx", 5, @"\\.\\corefx"},
+            { @"\\.\\corefx\", 5, @"\\.\\corefx\"},
+            { @"\\.\\temp\..\corefx\", 5, @"\\.\\corefx\"},
+        };
+
+        [Theory,
+            MemberData(nameof(RemoveRelativeSegmentsDeviceData)),
+            MemberData(nameof(RemoveRelativeSegmentsDeviceRootData))]
+        [PlatformSpecific(TestPlatforms.Windows)]
+        public void RemoveRelativeSegmentsDeviceTest(string path, int skip, string expected)
+        {
+            Assert.Equal(expected, PathInternal.RemoveRelativeSegments(path, skip));
+            StringBuilder sb = new StringBuilder(expected);
+            sb.Replace('.', '?', 0, 4);
+            expected = sb.ToString();
+
+            sb = new StringBuilder(path);
+            sb.Replace('.', '?', 0, 4);
+            path = sb.ToString();
+            Assert.Equal(expected, PathInternal.RemoveRelativeSegments(path, skip));
+        }
+
+        public static TheoryData<string, int, string> RemoveRelativeSegmentUnixData => new TheoryData<string, int, string>
+        {
+            { "/tmp/home", 1, "/tmp/home" },
+            { "/tmp/..", 1, "/" },
+            { "/tmp/home/../././", 1, "/tmp/" },
+            { "/tmp/../../../", 1, "//" },
+            { "/tmp//home", 1, "/tmp/home" },
+            { "/./tmp//home", 1, "/./tmp/home" },
+            { "/../tmp/home", 1, "/../tmp/home" },
+            { "/../../../tmp/./home", 1, "//tmp/home" },
+            { "//tmp///home", 1, "//tmp/home" },
+            { "/tmp/home/git/./.././git/corefx/../", 1, "/tmp/home/git/" },
+            { "/./tmp/home", 1, "/./tmp/home" },
+
+            { "/tmp/home", 4, "/tmp/home" },
+            { "/tmp/..", 4, "/tmp" },
+            { "/tmp/home/../././", 4, "/tmp/" },
+            { "/tmp/../../../", 4, "/tmp/" },
+            { "/tmp//home", 4, "/tmp/home" },
+            { "/./tmp//home", 2, "/./tmp/home" },
+            { "/../tmp/home", 3, "/../tmp/home" },
+            { "/../../../tmp/./home", 4, "/..//tmp/home" },
+            { "//tmp///home", 5, "//tmp/home" },
+            { "/tmp/home/git/./.././git/corefx/../", 5, "/tmp/home/git/" },
+            { "/./tmp/home", 3, "/./tmp/home" },
+
+            { "/tmp/../../", 8, "/tmp/../../" },
+            { "/tmp/home/../././", 10, "/tmp/home/../" },
+            { "/tmp/../../../", 8, "/tmp/..//" },
+            { "/tmp//home/.././/", 11, "/tmp//home/../" },
+            { "/./tmp//home/git/git", 7, "/./tmp//home/git/git" },
+            { "/../tmp/./home", 8, "/../tmp/./home" },
+            { "/../../../tmp/./home", 8, "/../../../tmp/home" },
+            { "//tmp///home/..", 5, "//tmp/" },
+            { "/tmp/home/git/./.././git/corefx/../", 16, "/tmp/home/git/./../git/" },
+            { "/./tmp/home/././", 7, "/./tmp/home/" },
+        };
+
+        [Theory,
+            MemberData(nameof(RemoveRelativeSegmentUnixData))]
+        [PlatformSpecific(TestPlatforms.AnyUnix)]
+        public void RemoveRelativeSegmentsUnix(string path, int skip, string expected)
+        {
+            Assert.Equal(expected, PathInternal.RemoveRelativeSegments(path, skip));
+        }
     }
 }