[corlib] Import FileSystemInfo and family from CoreFX

25 files changed, 46 insertions, 0 deletions

diff --git a/src/System.IO.FileSystem/tests/Base/BaseGetSetTimes.cs b/src/System.IO.FileSystem/tests/Base/BaseGetSetTimes.cs
index 865cde2ad8..bedd8652d5 100644
--- a/src/System.IO.FileSystem/tests/Base/BaseGetSetTimes.cs
+++ b/src/System.IO.FileSystem/tests/Base/BaseGetSetTimes.cs
@@ -72,6 +72,7 @@ namespace System.IO.Tests
 
         [Fact]
         [PlatformSpecific(TestPlatforms.Linux)] // Windows tested below, and OSX does not currently support millisec granularity
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "Seems to require CoreFX DriveInfo")]
         public void TimesIncludeMillisecondPart_Linux()
         {
             T item = GetExistingItem();
@@ -139,6 +140,7 @@ namespace System.IO.Tests
         [Fact]
         // OSX does not currently support millisec granularity: use this test as a canary to flag
         // if this ever changes so we can enable the actual test
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "Mono actually supports milliseconds on MacOS")]
         [PlatformSpecific(TestPlatforms.OSX)]
         public void TimesIncludeMillisecondPart_OSX()
         {
diff --git a/src/System.IO.FileSystem/tests/Base/FileGetSetAttributes.cs b/src/System.IO.FileSystem/tests/Base/FileGetSetAttributes.cs
index 59d784fbe9..408666e819 100644
--- a/src/System.IO.FileSystem/tests/Base/FileGetSetAttributes.cs
+++ b/src/System.IO.FileSystem/tests/Base/FileGetSetAttributes.cs
@@ -71,6 +71,7 @@ namespace System.IO.Tests
             InlineData(":bar:$DATA")]
         [PlatformSpecific(TestPlatforms.Windows)]
         [SkipOnTargetFramework(TargetFrameworkMonikers.NetFramework)]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "Not working")]
         public void GettingAndSettingAttributes_AlternateDataStream_Windows(string streamName)
         {
             string path = CreateItem();
diff --git a/src/System.IO.FileSystem/tests/Directory/CreateDirectory.cs b/src/System.IO.FileSystem/tests/Directory/CreateDirectory.cs
index 021a05b949..bace978a02 100644
--- a/src/System.IO.FileSystem/tests/Directory/CreateDirectory.cs
+++ b/src/System.IO.FileSystem/tests/Directory/CreateDirectory.cs
@@ -42,6 +42,7 @@ namespace System.IO.Tests
 
         [Theory, MemberData(nameof(PathsWithInvalidCharacters))]
         [SkipOnTargetFramework(TargetFrameworkMonikers.NetFramework)]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "Not working")]
         public void PathWithInvalidCharactersAsPath_Core(string invalidPath)
         {
             if (invalidPath.Contains('\0'))
@@ -226,6 +227,7 @@ namespace System.IO.Tests
         [Theory, MemberData(nameof(PathsWithInvalidColons))]
         [PlatformSpecific(TestPlatforms.Windows)]
         [SkipOnTargetFramework(TargetFrameworkMonikers.NetFramework)]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "Not working")]
         public void PathsWithInvalidColons_ThrowIOException_Core(string invalidPath)
         {
             // You can't actually create a directory with a colon in it. It was a preemptive
diff --git a/src/System.IO.FileSystem/tests/Directory/EnumerableAPIs.cs b/src/System.IO.FileSystem/tests/Directory/EnumerableAPIs.cs
index 72ccb773c9..99ba0c74b4 100644
--- a/src/System.IO.FileSystem/tests/Directory/EnumerableAPIs.cs
+++ b/src/System.IO.FileSystem/tests/Directory/EnumerableAPIs.cs
@@ -82,6 +82,7 @@ namespace System.IO.Tests
         }
 
         [Fact]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "Not working")]
         public void Clone_Enumerator_Trimmed_SearchPattern()
         {
             DirectoryInfo testDir = Directory.CreateDirectory(GetTestFilePath());
diff --git a/src/System.IO.FileSystem/tests/Directory/EnumerableTests.cs b/src/System.IO.FileSystem/tests/Directory/EnumerableTests.cs
index 7d604b6f1f..44f1870ac1 100644
--- a/src/System.IO.FileSystem/tests/Directory/EnumerableTests.cs
+++ b/src/System.IO.FileSystem/tests/Directory/EnumerableTests.cs
@@ -34,6 +34,7 @@ namespace System.IO.Tests
 
         [Fact]
         [SkipOnTargetFramework(TargetFrameworkMonikers.NetFramework)]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "Not working")]
         public void EnumerateDirectories_NonBreakingSpace()
         {
             DirectoryInfo rootDirectory = Directory.CreateDirectory(GetTestFilePath());
diff --git a/src/System.IO.FileSystem/tests/Directory/GetFileSystemEntries_str.cs b/src/System.IO.FileSystem/tests/Directory/GetFileSystemEntries_str.cs
index 01402a222b..fd0a8df134 100644
--- a/src/System.IO.FileSystem/tests/Directory/GetFileSystemEntries_str.cs
+++ b/src/System.IO.FileSystem/tests/Directory/GetFileSystemEntries_str.cs
@@ -232,6 +232,7 @@ namespace System.IO.Tests
 
         [Fact]
         [SkipOnTargetFramework(TargetFrameworkMonikers.NetFramework)]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "Not working")]
         public void InvalidPath_Core()
         {
             foreach (char invalid in Path.GetInvalidFileNameChars())
@@ -282,6 +283,7 @@ namespace System.IO.Tests
             InlineData("\t")]
         [PlatformSpecific(TestPlatforms.Windows)]
         [SkipOnTargetFramework(TargetFrameworkMonikers.NetFramework)]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "Not working")]
         public void WindowsInvalidCharsPath_Core(string invalid)
         {
             Assert.Throws<IOException>(() => GetEntries(invalid));
diff --git a/src/System.IO.FileSystem/tests/Directory/GetFileSystemEntries_str_str.cs b/src/System.IO.FileSystem/tests/Directory/GetFileSystemEntries_str_str.cs
index e96881bc46..4a6bfdc7e5 100644
--- a/src/System.IO.FileSystem/tests/Directory/GetFileSystemEntries_str_str.cs
+++ b/src/System.IO.FileSystem/tests/Directory/GetFileSystemEntries_str_str.cs
@@ -33,6 +33,7 @@ namespace System.IO.Tests
         }
 
         [Fact]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "Not working")]
         public void SearchPatternEmpty()
         {
             // To avoid OS differences we have decided not to throw an argument exception when empty
@@ -364,6 +365,7 @@ namespace System.IO.Tests
         }
 
         [ActiveIssue(20781, TestPlatforms.AnyUnix)]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "Not working")]
         // Can't do these without extended path support on Windows, UsingNewNormalization filters appropriately
         [ConditionalTheory(nameof(UsingNewNormalization)),
             InlineData(
diff --git a/src/System.IO.FileSystem/tests/Directory/GetFiles.cs b/src/System.IO.FileSystem/tests/Directory/GetFiles.cs
index 7a8a36bde6..6500dff40b 100644
--- a/src/System.IO.FileSystem/tests/Directory/GetFiles.cs
+++ b/src/System.IO.FileSystem/tests/Directory/GetFiles.cs
@@ -128,6 +128,7 @@ namespace System.IO.Tests
         }
 
         [Fact]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "Not working")]
         public void CharacterTests()
         {
             //bug #417100 - not sure if this hard coded approach is safe in all 9x platforms!!!
diff --git a/src/System.IO.FileSystem/tests/Directory/GetLogicalDrives.cs b/src/System.IO.FileSystem/tests/Directory/GetLogicalDrives.cs
index 8c147c11e9..86f1a6872d 100644
--- a/src/System.IO.FileSystem/tests/Directory/GetLogicalDrives.cs
+++ b/src/System.IO.FileSystem/tests/Directory/GetLogicalDrives.cs
@@ -12,6 +12,7 @@ namespace System.IO.Tests
     {
         [Fact]
         [PlatformSpecific(TestPlatforms.AnyUnix)]  // Valid drive strings on Unix
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "CoreFX DriveInfo not yet imported")]
         public void GetsValidDriveStrings_Unix()
         {
             string[] drives = Directory.GetLogicalDrives();
diff --git a/src/System.IO.FileSystem/tests/DirectoryInfo/Create.cs b/src/System.IO.FileSystem/tests/DirectoryInfo/Create.cs
index fb2430fd29..45c2a637d0 100644
--- a/src/System.IO.FileSystem/tests/DirectoryInfo/Create.cs
+++ b/src/System.IO.FileSystem/tests/DirectoryInfo/Create.cs
@@ -43,6 +43,7 @@ namespace System.IO.Tests
         [InlineData(".")]
         [InlineData("............")]
         [PlatformSpecific(TestPlatforms.Windows)]  // Windows-invalid extensions are removed
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "Not working")]
         public void WindowsInvalidExtensionsAreRemoved(string extension)
         {
             string testDir = GetTestFilePath();
@@ -54,6 +55,7 @@ namespace System.IO.Tests
         [InlineData(".s", ".")]
         [InlineData(".s", ".s....")]
         [PlatformSpecific(TestPlatforms.Windows)]  // Trailing dots in extension are removed
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "Not working")]
         public void WindowsCurtailTrailingDots(string extension, string trailing)
         {
             string testDir = GetTestFilePath();
diff --git a/src/System.IO.FileSystem/tests/DirectoryInfo/CreateSubdirectory.cs b/src/System.IO.FileSystem/tests/DirectoryInfo/CreateSubdirectory.cs
index 75af106c41..d87fc7f142 100644
--- a/src/System.IO.FileSystem/tests/DirectoryInfo/CreateSubdirectory.cs
+++ b/src/System.IO.FileSystem/tests/DirectoryInfo/CreateSubdirectory.cs
@@ -151,6 +151,7 @@ namespace System.IO.Tests
             MemberData(nameof(ControlWhiteSpace))]
         [PlatformSpecific(TestPlatforms.Windows)]
         [SkipOnTargetFramework(TargetFrameworkMonikers.NetFramework)]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "Not working")]
         public void WindowsControlWhiteSpace_Core(string component)
         {
             Assert.Throws<IOException>(() => new DirectoryInfo(TestDirectory).CreateSubdirectory(component));
diff --git a/src/System.IO.FileSystem/tests/DirectoryInfo/ToString.cs b/src/System.IO.FileSystem/tests/DirectoryInfo/ToString.cs
index de2ea39621..c22986201e 100644
--- a/src/System.IO.FileSystem/tests/DirectoryInfo/ToString.cs
+++ b/src/System.IO.FileSystem/tests/DirectoryInfo/ToString.cs
@@ -39,6 +39,7 @@ namespace System.IO.Tests
 
         [Fact]
         [SkipOnTargetFramework(TargetFrameworkMonikers.Netcoreapp)]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "Not working")]
         [PlatformSpecific(TestPlatforms.Windows)]  // Drive letter only
         public void DriveOnlyReturnsPeriod_Windows_Desktop()
         {
diff --git a/src/System.IO.FileSystem/tests/File/Copy.cs b/src/System.IO.FileSystem/tests/File/Copy.cs
index 1caca2aae1..81338ceb91 100644
--- a/src/System.IO.FileSystem/tests/File/Copy.cs
+++ b/src/System.IO.FileSystem/tests/File/Copy.cs
@@ -32,6 +32,7 @@ namespace System.IO.Tests
         }
 
         [Fact]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "CoreFX FileStream not yet imported")]
         public void CopyOntoDirectory()
         {
             string testFile = GetTestFilePath();
@@ -48,6 +49,7 @@ namespace System.IO.Tests
         }
 
         [Fact]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "CoreFX FileStream not yet imported")]
         public void NonExistentPath()
         {
             FileInfo testFile = new FileInfo(GetTestFilePath());
@@ -70,6 +72,7 @@ namespace System.IO.Tests
         }
 
         [Fact]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "CoreFX File not yet imported")]
         public void ShortenLongPath()
         {
             string testFileSource = GetTestFilePath();
@@ -190,6 +193,7 @@ namespace System.IO.Tests
             InlineData("\t")]
         [PlatformSpecific(TestPlatforms.Windows)]
         [SkipOnTargetFramework(TargetFrameworkMonikers.NetFramework)]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "CoreFX File not yet imported")]
         public void WindowsInvalidCharsPath_Core(string invalid)
         {
             string testFile = GetTestFilePath();
@@ -225,6 +229,7 @@ namespace System.IO.Tests
             InlineData("::$DATA", ":bar:$DATA")]
         [PlatformSpecific(TestPlatforms.Windows)]
         [SkipOnTargetFramework(TargetFrameworkMonikers.NetFramework)]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "CoreFX File not yet imported")]
         public void WindowsAlternateDataStream(string defaultStream, string alternateStream)
         {
             DirectoryInfo testDirectory = Directory.CreateDirectory(GetTestFilePath());
@@ -323,6 +328,7 @@ namespace System.IO.Tests
             InlineData("::$DATA", ":bar:$DATA")]
         [PlatformSpecific(TestPlatforms.Windows)]
         [SkipOnTargetFramework(TargetFrameworkMonikers.NetFramework)]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "CoreFX File not yet imported")]
         public void WindowsAlternateDataStreamOverwrite(string defaultStream, string alternateStream)
         {
             DirectoryInfo testDirectory = Directory.CreateDirectory(GetTestFilePath());
diff --git a/src/System.IO.FileSystem/tests/File/Delete.cs b/src/System.IO.FileSystem/tests/File/Delete.cs
index 1dd95f6040..39fe6a7779 100644
--- a/src/System.IO.FileSystem/tests/File/Delete.cs
+++ b/src/System.IO.FileSystem/tests/File/Delete.cs
@@ -113,6 +113,7 @@ namespace System.IO.Tests
 
         [Fact]
         [PlatformSpecific(TestPlatforms.AnyUnix)]  // Deleting non-existent path doesn't throw
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "CoreFX File not yet imported")]
         public void Unix_NonExistentPath_Nop()
         {
             Delete(Path.Combine(TestDirectory, GetTestFileName(), "C"));
@@ -199,6 +200,7 @@ namespace System.IO.Tests
             InlineData(":bar:$DATA")]
         [PlatformSpecific(TestPlatforms.Windows)]
         [SkipOnTargetFramework(TargetFrameworkMonikers.NetFramework)]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "CoreFX File not yet imported")]
         public void WindowsDeleteAlternateDataStream(string streamName)
         {
             FileInfo testFile = Create(GetTestFilePath());
diff --git a/src/System.IO.FileSystem/tests/File/Move.cs b/src/System.IO.FileSystem/tests/File/Move.cs
index 304094a999..e9da920edd 100644
--- a/src/System.IO.FileSystem/tests/File/Move.cs
+++ b/src/System.IO.FileSystem/tests/File/Move.cs
@@ -56,6 +56,7 @@ namespace System.IO.Tests
 
         [Theory, MemberData(nameof(PathsWithInvalidCharacters))]
         [SkipOnTargetFramework(TargetFrameworkMonikers.NetFramework)]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "Not working")]
         public void PathWithIllegalCharacters_Core(string invalidPath)
         {
             FileInfo testFile = new FileInfo(GetTestFilePath());
diff --git a/src/System.IO.FileSystem/tests/File/ReadWriteAllLines.cs b/src/System.IO.FileSystem/tests/File/ReadWriteAllLines.cs
index f86f6b1a40..1705fabbb8 100644
--- a/src/System.IO.FileSystem/tests/File/ReadWriteAllLines.cs
+++ b/src/System.IO.FileSystem/tests/File/ReadWriteAllLines.cs
@@ -38,6 +38,7 @@ namespace System.IO.Tests
         }
 
         [Fact]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "CoreFX File not yet imported")]
         public void NullLines()
         {
             string path = GetTestFilePath();
@@ -128,6 +129,7 @@ namespace System.IO.Tests
         }
 
         [Fact]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "CoreFX File not yet imported")]
         public void DisposingEnumeratorClosesFile()
         {
             string path = GetTestFilePath();
@@ -226,6 +228,7 @@ namespace System.IO.Tests
         }
 
         [Fact]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "CoreFX File not yet imported")]
         public void NullLines()
         {
             string path = GetTestFilePath();
@@ -316,6 +319,7 @@ namespace System.IO.Tests
         }
 
         [Fact]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "CoreFX FileStream not yet imported")]
         public void DisposingEnumeratorClosesFile()
         {
             string path = GetTestFilePath();
diff --git a/src/System.IO.FileSystem/tests/FileInfo/Extension.cs b/src/System.IO.FileSystem/tests/FileInfo/Extension.cs
index 5137924e91..c29afc7112 100644
--- a/src/System.IO.FileSystem/tests/FileInfo/Extension.cs
+++ b/src/System.IO.FileSystem/tests/FileInfo/Extension.cs
@@ -25,6 +25,7 @@ namespace System.IO.Tests
         [InlineData(".")]
         [InlineData("............")]
         [PlatformSpecific(TestPlatforms.Windows)]  // Windows-invalid extensions should be removed
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "Not working")]
         public void WindowsInvalidExtensionsAreRemoved(string extension)
         {
             string testFile = GetTestFilePath();
@@ -36,6 +37,7 @@ namespace System.IO.Tests
         [InlineData(".s", ".")]
         [InlineData(".s", ".s....")]
         [PlatformSpecific(TestPlatforms.Windows)]  // Trailing dots in extension are removed
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "Not working")]
         public void WindowsCurtailTrailingDots(string extension, string trailing)
         {
             string testFile = GetTestFilePath();
diff --git a/src/System.IO.FileSystem/tests/FileInfo/IsReadOnly.cs b/src/System.IO.FileSystem/tests/FileInfo/IsReadOnly.cs
index 2833dc6a09..69c238fe9b 100644
--- a/src/System.IO.FileSystem/tests/FileInfo/IsReadOnly.cs
+++ b/src/System.IO.FileSystem/tests/FileInfo/IsReadOnly.cs
@@ -23,6 +23,7 @@ namespace System.IO.Tests
         }
 
         [Theory, MemberData(nameof(TrailingCharacters))]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "Not working")]
         public void ReadOnly(char trailingChar)
         {
             string path = GetTestFilePath() + trailingChar;
diff --git a/src/System.IO.FileSystem/tests/FileStream/ctor_sfh_fa.cs b/src/System.IO.FileSystem/tests/FileStream/ctor_sfh_fa.cs
index 3f319f8946..a63b2173f7 100644
--- a/src/System.IO.FileSystem/tests/FileStream/ctor_sfh_fa.cs
+++ b/src/System.IO.FileSystem/tests/FileStream/ctor_sfh_fa.cs
@@ -108,6 +108,7 @@ namespace System.IO.Tests
         }
 
         [Fact]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "CoreFX FileStream not yet imported")]
         public void InconsistentFileAccessThrows()
         {
             string fileName = GetTestFilePath();
diff --git a/src/System.IO.FileSystem/tests/FileStream/ctor_sfh_fa_buffer_async.cs b/src/System.IO.FileSystem/tests/FileStream/ctor_sfh_fa_buffer_async.cs
index 8529d1e764..781b47158c 100644
--- a/src/System.IO.FileSystem/tests/FileStream/ctor_sfh_fa_buffer_async.cs
+++ b/src/System.IO.FileSystem/tests/FileStream/ctor_sfh_fa_buffer_async.cs
@@ -31,6 +31,7 @@ namespace System.IO.Tests
         }
 
         [Fact]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "CoreFX FileStream not yet imported")]
         public void UnmatchedAsyncThrows()
         {
             using (FileStream fs = new FileStream(GetTestFilePath(), FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite | FileShare.Delete, 4096, true))
diff --git a/src/System.IO.FileSystem/tests/FileStream/ctor_str_fm.cs b/src/System.IO.FileSystem/tests/FileStream/ctor_str_fm.cs
index 45791fe767..7dd5923602 100644
--- a/src/System.IO.FileSystem/tests/FileStream/ctor_str_fm.cs
+++ b/src/System.IO.FileSystem/tests/FileStream/ctor_str_fm.cs
@@ -38,6 +38,7 @@ namespace System.IO.Tests
         }
 
         [Theory, MemberData(nameof(TrailingCharacters))]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "CoreFX FileStream not yet imported")]
         public void MissingFile_ThrowsFileNotFound(char trailingChar)
         {
             string path = GetTestFilePath() + trailingChar;
diff --git a/src/System.IO.FileSystem/tests/FileStream/ctor_str_fm_fa_fs.cs b/src/System.IO.FileSystem/tests/FileStream/ctor_str_fm_fa_fs.cs
index c3e0adfe30..da44bb8fd3 100644
--- a/src/System.IO.FileSystem/tests/FileStream/ctor_str_fm_fa_fs.cs
+++ b/src/System.IO.FileSystem/tests/FileStream/ctor_str_fm_fa_fs.cs
@@ -122,6 +122,7 @@ namespace System.IO.Tests
         [Theory]
         [InlineData(FileMode.Create)]
         [InlineData(FileMode.Truncate)]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "CoreFX FileStream not yet imported")]
         public void NoTruncateOnFileShareViolation(FileMode fileMode)
         {
             string fileName = GetTestFilePath();
diff --git a/src/System.IO.FileSystem/tests/FileStream/ctor_str_fm_fa_fs.delete.cs b/src/System.IO.FileSystem/tests/FileStream/ctor_str_fm_fa_fs.delete.cs
index dcd4978f57..2bc83bda53 100644
--- a/src/System.IO.FileSystem/tests/FileStream/ctor_str_fm_fa_fs.delete.cs
+++ b/src/System.IO.FileSystem/tests/FileStream/ctor_str_fm_fa_fs.delete.cs
@@ -12,6 +12,7 @@ namespace System.IO.Tests
     public partial class FileStream_ctor_str_fm_fa_fs
     {
         [Fact]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "CoreFX FileStream not yet imported")]
         public void FileShareDeleteNew()
         {
             string fileName = GetTestFilePath();
@@ -43,6 +44,7 @@ namespace System.IO.Tests
         }
 
         [Fact]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "CoreFX FileStream not yet imported")]
         public void FileShareDeleteExisting()
         {
             // create the file
@@ -87,6 +89,7 @@ namespace System.IO.Tests
 
         [Fact]
         [PlatformSpecific(TestPlatforms.Windows)] // file sharing restriction limitations on Unix
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "CoreFX FileStream not yet imported")]
         public void FileShareDeleteExistingMultipleClients()
         {
             // create the file
diff --git a/src/System.IO.FileSystem/tests/FileStream/ctor_str_fm_fa_fs_buffer_fo.cs b/src/System.IO.FileSystem/tests/FileStream/ctor_str_fm_fa_fs_buffer_fo.cs
index 596144845e..aa17afb0e2 100644
--- a/src/System.IO.FileSystem/tests/FileStream/ctor_str_fm_fa_fs_buffer_fo.cs
+++ b/src/System.IO.FileSystem/tests/FileStream/ctor_str_fm_fa_fs_buffer_fo.cs
@@ -21,6 +21,7 @@ namespace System.IO.Tests
         }
 
         [Fact]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "CoreFX FileStream not yet imported")]
         public void InvalidFileOptionsThrow()
         {
             AssertExtensions.Throws<ArgumentOutOfRangeException>("options", () => CreateFileStream(GetTestFilePath(), FileMode.Create, FileAccess.ReadWrite, FileShare.Read, c_DefaultBufferSize, ~FileOptions.None));
@@ -68,6 +69,7 @@ namespace System.IO.Tests
         [InlineData(FileOptions.Encrypted)]
         [InlineData(FileOptions.Asynchronous | FileOptions.Encrypted)]
         [InlineData(FileOptions.Asynchronous | FileOptions.DeleteOnClose | FileOptions.Encrypted | FileOptions.RandomAccess | FileOptions.SequentialScan | FileOptions.WriteThrough)]
+        [SkipOnTargetFramework(TargetFrameworkMonikers.Mono, "CoreFX FileStream not yet imported")]
         public void ValidFileOptions_Encrypted(FileOptions option)
         {
             try { ValidFileOptions(option); }
diff --git a/src/System.IO.FileSystem/tests/PortedCommon/ReparsePointUtilities.cs b/src/System.IO.FileSystem/tests/PortedCommon/ReparsePointUtilities.cs
index d9bf124acf..81fa1c19e6 100644
--- a/src/System.IO.FileSystem/tests/PortedCommon/ReparsePointUtilities.cs
+++ b/src/System.IO.FileSystem/tests/PortedCommon/ReparsePointUtilities.cs
@@ -32,6 +32,9 @@ public static class MountHelper
     /// <summary>Creates a symbolic link using command line tools</summary>
     /// <param name="linkPath">The existing file</param>
     /// <param name="targetPath"></param>
+#if MONO && MOBILE// No external process support
+    public static bool CreateSymbolicLink(string linkpath, string targetPath, bool isDirectory) => throw new PlatformNotSupportedException();
+#else
     public static bool CreateSymbolicLink(string linkPath, string targetPath, bool isDirectory)
     {
         Process symLinkProcess = new Process();
@@ -59,6 +62,7 @@ public static class MountHelper
             return false;
         }
     }
+#endif
 
     public static void Mount(String volumeName, String mountPoint)
     {