[browser][file system] Tests System.IO.FileSystem (dotnet#39768)

* [browser][file system] Tests System.IO.FileSystem * Remove FileSystem from test project exclusions. * [browser][filesystem] Comment on skipped tests due to IO.Pipes not supported * [browser][filesystem] Comment on skipped tests due to monitor not supported * Address review comments * Address review comments on how to handle monitor PNSE * Update src/libraries/System.IO.FileSystem/tests/File/GetSetTimes.cs Co-authored-by: Jan Kotas <jkotas@microsoft.com> * Add ActiveIssue for browser platform ``` [ActiveIssue("dotnet#39955", TestPlatforms.Browser)] public void NotFoundErrorIsExpected() ``` * Simplify test case with `PlatformDetection.IsSuperUser` as per review comment * Remove unused variable from tests * Browser platform volume does not limit each component of the path to a total of 255 characters. - Remove the test `DirectoryWithComponentLongerThanMaxComponentAsPath_ThrowsException` for Browser platform. - Add new test `DirectoryWithComponentLongerThanMaxComponentAsPath_BrowserDoesNotThrowsException` for Browser platform in case this check is added in the future. * Fix windows tests * Add ActiveIssue to test System.IO.Tests.DirectoryInfo_Name.CurrentDirectory - System.IO.Tests.DirectoryInfo_Name.CurrentDirectory does not pass because it is using Path.GetFileName on the current directory of "/". - See issue dotnet#39998 for more information * Add active issue for tests that need to support file locking. * Add active issue for tests that need to support file locking. * Browser volume does not have a limit on segments * Remove browser platform test * Remove active issue for NotFoundErrorIsExpected * Remove platform specific from SkippingHiddenFiles * Fix enumeration test errors failing from `HiddenFilesAreReturned`. - WebAssembly (BROWSER) has dirent d_type but is not identifying correctly but by returning UNKNOWN the managed code properly stats the file to detect if entry is directory or not. * Fix enumeration test errors failing from `HiddenFilesAreReturned`. - WebAssembly (BROWSER) has dirent d_type but is not identifying correctly but by returning UNKNOWN the managed code properly stats the file to detect if entry is directory or not. * Fix build for TARGET_WASM not defined * Address review comment by add check for IsWindows to IsSuperUser. * Address review comment by add check for IsWindows to IsSuperUser. * Platform Specific test for hidden files no longer needed. * Platform Specific test fno longer needed. * Use active issue for rename issue * ActiveIssue no longer needed - PR dotnet#40310 works around the issue for now while waiting for fix emscripten-core/emscripten#11804 / emscripten-core/emscripten#11812 * Use ActiveIssue for SettingUpdatesProperties * Use ActiveIssue for TimesIncludeMillisecondPart * Use ActiveIssue for ErrorHandlingTests failures * Use ActiveIssue for SetUptoNanoseconds * Use ActiveIssue for GetSetTimes test failures * Use ActiveIssue for tests failing with DirectoryNotFoundException * Use ActiveIssue for tests failing with UnauthorizedAccessException * Remove debugging statement from pal_io * Address type in CreateDirectory method name Co-authored-by: Jan Kotas <jkotas@microsoft.com> Co-authored-by: Mitchell Hwang <mitchell.hwang@microsoft.com>
nattress · Aug 10, 2020 · 4dbe414 · 4dbe414
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diff --git a/src/libraries/Common/tests/TestUtilities/System/PlatformDetection.Unix.cs b/src/libraries/Common/tests/TestUtilities/System/PlatformDetection.Unix.cs
@@ -47,9 +47,7 @@ public static partial class PlatformDetection
         public static bool IsNotFedoraOrRedHatFamily => !IsFedora && !IsRedHatFamily;
         public static bool IsNotDebian10 => !IsDebian10;
 
-        public static bool IsSuperUser => IsBrowser ? false : (!IsWindows ?
-            libc.geteuid() == 0 :
-            throw new PlatformNotSupportedException());
+        public static bool IsSuperUser => IsBrowser || IsWindows ? false : libc.geteuid() == 0;
 
         public static Version OpenSslVersion => !IsOSXLike && !IsWindows ?
             GetOpenSslVersion() :

diff --git a/src/libraries/Native/Unix/System.Native/pal_io.c b/src/libraries/Native/Unix/System.Native/pal_io.c
@@ -91,7 +91,10 @@ c_static_assert(PAL_S_IFSOCK == S_IFSOCK);
 // Validate that our enum for inode types is the same as what is
 // declared by the dirent.h header on the local system.
 // (AIX doesn't have dirent d_type, so none of this there)
-#if defined(DT_UNKNOWN)
+// WebAssembly (BROWSER) has dirent d_type but is not correct
+// by returning UNKNOWN the managed code properly stats the file
+// to detect if entry is directory or not.
+#if defined(DT_UNKNOWN) || defined(TARGET_WASM)
 c_static_assert((int)PAL_DT_UNKNOWN == (int)DT_UNKNOWN);
 c_static_assert((int)PAL_DT_FIFO == (int)DT_FIFO);
 c_static_assert((int)PAL_DT_CHR == (int)DT_CHR);
@@ -345,10 +348,13 @@ static void ConvertDirent(const struct dirent* entry, DirectoryEntry* outputEntr
     // the start of the unmanaged string. Give the caller back a pointer to the
     // location of the start of the string that exists in their own byte buffer.
     outputEntry->Name = entry->d_name;
-#if !defined(DT_UNKNOWN)
+#if !defined(DT_UNKNOWN) || defined(TARGET_WASM)
     // AIX has no d_type, and since we can't get the directory that goes with
     // the filename from ReadDir, we can't stat the file. Return unknown and
     // hope that managed code can properly stat the file.
+    // WebAssembly (BROWSER) has dirent d_type but is not correct
+    // by returning UNKNOWN the managed code properly stats the file
+    // to detect if entry is directory or not.
     outputEntry->InodeType = PAL_DT_UNKNOWN;
 #else
     outputEntry->InodeType = (int32_t)entry->d_type;

diff --git a/src/libraries/System.IO.FileSystem/tests/Base/BaseGetSetTimes.cs b/src/libraries/System.IO.FileSystem/tests/Base/BaseGetSetTimes.cs
@@ -41,6 +41,7 @@ public static TimeFunction Create(SetTime setter, GetTime getter, DateTimeKind k
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/40528", TestPlatforms.Browser)]
         public void SettingUpdatesProperties()
         {
             T item = GetExistingItem();
@@ -77,6 +78,7 @@ public void CanGetAllTimesAfterCreation()
         }
 
         [ConditionalFact(nameof(isNotHFS))] // OSX HFS driver format does not support millisec granularity
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/40530", TestPlatforms.Browser)]
         public void TimesIncludeMillisecondPart()
         {
             T item = GetExistingItem();

diff --git a/src/libraries/System.IO.FileSystem/tests/Directory/CreateDirectory.cs b/src/libraries/System.IO.FileSystem/tests/Directory/CreateDirectory.cs
@@ -210,17 +210,26 @@ public void DirectoryEqualToMaxDirectory_CanBeCreatedAllAtOnce()
             Assert.Equal(path, result.FullName);
             Assert.True(Directory.Exists(result.FullName));
         }
+        #endregion
+
+        #region PlatformSpecific
 
         [Theory,
             MemberData(nameof(PathsWithComponentLongerThanMaxComponent))]
+        [PlatformSpecific(~TestPlatforms.Browser)] // Browser does not have a limit on the maximum component length
         public void DirectoryWithComponentLongerThanMaxComponentAsPath_ThrowsException(string path)
         {
             AssertExtensions.ThrowsAny<IOException, DirectoryNotFoundException, PathTooLongException>(() => Create(path));
         }
 
-        #endregion
-
-        #region PlatformSpecific
+        [Theory,
+            MemberData(nameof(PathsWithComponentLongerThanMaxComponent))]
+        [PlatformSpecific(TestPlatforms.Browser)] // Browser specific test in case the check changes in the future
+        public void DirectoryWithComponentLongerThanMaxComponentAsPath_BrowserDoesNotThrowException(string path)
+        {
+            DirectoryInfo result = Create(path);
+            Assert.True(Directory.Exists(path));
+        }
 
         [Theory, MemberData(nameof(PathsWithInvalidColons))]
         [PlatformSpecific(TestPlatforms.Windows)]

diff --git a/src/libraries/System.IO.FileSystem/tests/Directory/Delete.cs b/src/libraries/System.IO.FileSystem/tests/Directory/Delete.cs
@@ -244,6 +244,7 @@ public void RecursiveDelete()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/40536", TestPlatforms.Browser)]
         public void RecursiveDeleteWithTrailingSlash()
         {
             DirectoryInfo testDir = Directory.CreateDirectory(GetTestFilePath());

diff --git a/src/libraries/System.IO.FileSystem/tests/Directory/Exists.cs b/src/libraries/System.IO.FileSystem/tests/Directory/Exists.cs
@@ -390,7 +390,7 @@ public void SubdirectoryOnNonExistentDriveAsPath_ReturnsFalse()
         }
 
         [Fact]
-        [PlatformSpecific(TestPlatforms.AnyUnix)]  // Makes call to native code (libc)
+        [PlatformSpecific(TestPlatforms.AnyUnix & ~TestPlatforms.Browser)]  // Makes call to native code (libc)
         public void FalseForNonRegularFile()
         {
             string fileName = GetTestFilePath();

diff --git a/src/libraries/System.IO.FileSystem/tests/Directory/Move.cs b/src/libraries/System.IO.FileSystem/tests/Directory/Move.cs
@@ -173,6 +173,7 @@ public void DirectoryNameWithSpaces()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/40536", TestPlatforms.Browser)]
         public void TrailingDirectorySeparators()
         {
             string testDirSource = Path.Combine(TestDirectory, GetTestFileName());

diff --git a/src/libraries/System.IO.FileSystem/tests/DirectoryInfo/Exists.cs b/src/libraries/System.IO.FileSystem/tests/DirectoryInfo/Exists.cs
@@ -110,7 +110,7 @@ public void FalseForFile()
         }
 
         [Fact]
-        [PlatformSpecific(TestPlatforms.AnyUnix)]  // Uses P/Invokes
+        [PlatformSpecific(TestPlatforms.AnyUnix & ~TestPlatforms.Browser)]  // Uses P/Invokes
         public void FalseForNonRegularFile()
         {
             string fileName = GetTestFilePath();

diff --git a/src/libraries/System.IO.FileSystem/tests/DirectoryInfo/MoveTo.cs b/src/libraries/System.IO.FileSystem/tests/DirectoryInfo/MoveTo.cs
@@ -24,6 +24,7 @@ protected virtual void Move(DirectoryInfo sourceDir, string destDir)
         #region UniversalTests
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/40536", TestPlatforms.Browser)]
         public void DirectoryPathUpdatesOnMove()
         {
             //NOTE: MoveTo adds a trailing separator character to the FullName of a DirectoryInfo

diff --git a/src/libraries/System.IO.FileSystem/tests/DirectoryInfo/Name.cs b/src/libraries/System.IO.FileSystem/tests/DirectoryInfo/Name.cs
@@ -8,6 +8,7 @@ namespace System.IO.Tests
     public class DirectoryInfo_Name : FileSystemTest
     {
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/39998", TestPlatforms.Browser)]
         public void CurrentDirectory()
         {
             var info = new DirectoryInfo(".");

diff --git a/src/libraries/System.IO.FileSystem/tests/Enumeration/ErrorHandlingTests.cs b/src/libraries/System.IO.FileSystem/tests/Enumeration/ErrorHandlingTests.cs
@@ -102,6 +102,7 @@ public void DeleteDirectoryAfterOpening()
         }
 
     [Fact]
+    [ActiveIssue("https://github.com/dotnet/runtime/issues/40531", TestPlatforms.Browser)]
     public void VariableLengthFileNames_AllCreatableFilesAreEnumerable()
     {
         DirectoryInfo testDirectory = Directory.CreateDirectory(GetTestFilePath());
@@ -119,6 +120,7 @@ public void VariableLengthFileNames_AllCreatableFilesAreEnumerable()
     }
 
     [Fact]
+    [ActiveIssue("https://github.com/dotnet/runtime/issues/40531", TestPlatforms.Browser)]
     public void VariableLengthDirectoryNames_AllCreatableDirectoriesAreEnumerable()
     {
         DirectoryInfo testDirectory = Directory.CreateDirectory(GetTestFilePath());

diff --git a/src/libraries/System.IO.FileSystem/tests/File/Copy.cs b/src/libraries/System.IO.FileSystem/tests/File/Copy.cs
@@ -108,6 +108,7 @@ public static IEnumerable<object[]> CopyFileWithData_MemberData()
 
         [Theory]
         [MemberData(nameof(CopyFileWithData_MemberData))]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/40543", TestPlatforms.Browser)]
         public void CopyFileWithData(char[] data, bool readOnly)
         {
             string testFileSource = GetTestFilePath();
@@ -140,7 +141,10 @@ public void CopyFileWithData(char[] data, bool readOnly)
             }
 
             // Ensure last write/access time on the new file is appropriate
-            Assert.InRange(File.GetLastWriteTimeUtc(testFileDest), lastWriteTime.AddSeconds(-1), lastWriteTime.AddSeconds(1));
+            if (PlatformDetection.IsNotBrowser) // There is only one write time on browser vfs
+            {
+                Assert.InRange(File.GetLastWriteTimeUtc(testFileDest), lastWriteTime.AddSeconds(-1), lastWriteTime.AddSeconds(1));
+            }
 
             Assert.Equal(readOnly, (File.GetAttributes(testFileDest) & FileAttributes.ReadOnly) != 0);
             if (readOnly)

diff --git a/src/libraries/System.IO.FileSystem/tests/File/Create.cs b/src/libraries/System.IO.FileSystem/tests/File/Create.cs
@@ -111,6 +111,7 @@ public void InvalidDirectory()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/40065", TestPlatforms.Browser)]
         public void FileInUse()
         {
             DirectoryInfo testDir = Directory.CreateDirectory(GetTestFilePath());
@@ -144,7 +145,12 @@ public void OverwriteReadOnly()
             Assert.True(File.Exists(testFile));
         }
 
+        #endregion
+
+        #region PlatformSpecific
+
         [Fact]
+        [PlatformSpecific(~TestPlatforms.Browser)] // Browser platform volume does not limit segments
         public void LongPathSegment()
         {
             DirectoryInfo testDir = Directory.CreateDirectory(GetTestFilePath());
@@ -153,10 +159,6 @@ public void LongPathSegment()
               Create(Path.Combine(testDir.FullName, new string('a', 300))));
         }
 
-        #endregion
-
-        #region PlatformSpecific
-
         [Fact]
         [PlatformSpecific(TestPlatforms.AnyUnix)]
         public void LongDirectoryName()

diff --git a/src/libraries/System.IO.FileSystem/tests/File/Exists.cs b/src/libraries/System.IO.FileSystem/tests/File/Exists.cs
@@ -247,7 +247,7 @@ public void DirectoryWithComponentLongerThanMaxComponentAsPath_ReturnsFalse(stri
         }
 
         [Fact]
-        [PlatformSpecific(TestPlatforms.AnyUnix)]  // Uses P/Invokes
+        [PlatformSpecific(TestPlatforms.AnyUnix & ~TestPlatforms.Browser)]  // Uses P/Invokes
         public void FalseForNonRegularFile()
         {
             string fileName = GetTestFilePath();

diff --git a/src/libraries/System.IO.FileSystem/tests/File/GetSetTimes.cs b/src/libraries/System.IO.FileSystem/tests/File/GetSetTimes.cs
@@ -13,7 +13,7 @@ public class File_GetSetTimes : StaticGetSetTimes
     {
         // OSX has the limitation of setting upto 2262-04-11T23:47:16 (long.Max) date.
         // 32bit Unix has time_t up to ~ 2038.
-        private static bool SupportsLongMaxDateTime => PlatformDetection.IsWindows || (RuntimeInformation.ProcessArchitecture != Architecture.Arm && RuntimeInformation.ProcessArchitecture != Architecture.X86 && !PlatformDetection.IsOSXLike);
+        private static bool SupportsLongMaxDateTime => PlatformDetection.IsWindows || (!PlatformDetection.Is32BitProcess && !PlatformDetection.IsOSXLike);
 
         protected override string GetExistingItem()
         {
@@ -135,6 +135,7 @@ public void SetLastWriteTimeTicks()
         }
 
         [ConditionalFact(nameof(isNotHFS))] // OSX HFS driver format does not support nanosecond granularity.
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/40532", TestPlatforms.Browser)]
         public void SetUptoNanoseconds()
         {
             string file = GetTestFilePath();

diff --git a/src/libraries/System.IO.FileSystem/tests/File/ReadWriteAllBytes.cs b/src/libraries/System.IO.FileSystem/tests/File/ReadWriteAllBytes.cs
@@ -80,6 +80,7 @@ public void Overwrite()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/40065", TestPlatforms.Browser)]
         public void OpenFile_ThrowsIOException()
         {
             string path = GetTestFilePath();
@@ -105,7 +106,7 @@ public void WriteToReadOnlyFile()
             try
             {
                 // Operation succeeds when being run by the Unix superuser
-                if (!OperatingSystem.IsWindows() && geteuid() == 0)
+                if (PlatformDetection.IsSuperUser)
                 {
                     File.WriteAllBytes(path, Encoding.UTF8.GetBytes("text"));
                     Assert.Equal(Encoding.UTF8.GetBytes("text"), File.ReadAllBytes(path));

diff --git a/src/libraries/System.IO.FileSystem/tests/File/ReadWriteAllBytesAsync.cs b/src/libraries/System.IO.FileSystem/tests/File/ReadWriteAllBytesAsync.cs
@@ -94,6 +94,7 @@ public async Task OverwriteAsync()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/40065", TestPlatforms.Browser)]
         public async Task OpenFile_ThrowsIOExceptionAsync()
         {
             string path = GetTestFilePath();
@@ -119,7 +120,7 @@ public async Task WriteToReadOnlyFileAsync()
             try
             {
                 // Operation succeeds when being run by the Unix superuser
-                if (!OperatingSystem.IsWindows() && geteuid() == 0)
+                if (PlatformDetection.IsSuperUser)
                 {
                     await File.WriteAllBytesAsync(path, Encoding.UTF8.GetBytes("text"));
                     Assert.Equal(Encoding.UTF8.GetBytes("text"), await File.ReadAllBytesAsync(path));

diff --git a/src/libraries/System.IO.FileSystem/tests/File/ReadWriteAllLines.cs b/src/libraries/System.IO.FileSystem/tests/File/ReadWriteAllLines.cs
@@ -78,6 +78,7 @@ public virtual void Overwrite()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/40065", TestPlatforms.Browser)]
         public void OpenFile_ThrowsIOException()
         {
             string path = GetTestFilePath();
@@ -111,7 +112,7 @@ public void WriteToReadOnlyFile()
             try
             {
                 // Operation succeeds when being run by the Unix superuser
-                if (!OperatingSystem.IsWindows() && geteuid() == 0)
+                if (PlatformDetection.IsSuperUser)
                 {
                     Write(path, new string[] { "text" });
                     Assert.Equal(new string[] { "text" }, Read(path));
@@ -266,6 +267,7 @@ public virtual void Overwrite()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/40065", TestPlatforms.Browser)]
         public void OpenFile_ThrowsIOException()
         {
             string path = GetTestFilePath();
@@ -299,7 +301,7 @@ public void WriteToReadOnlyFile()
             try
             {
                 // Operation succeeds when being run by the Unix superuser
-                if (!OperatingSystem.IsWindows() && geteuid() == 0)
+                if (PlatformDetection.IsSuperUser)
                 {
                     Write(path, new string[] { "text" });
                     Assert.Equal(new string[] { "text" }, Read(path));

diff --git a/src/libraries/System.IO.FileSystem/tests/File/ReadWriteAllLinesAsync.cs b/src/libraries/System.IO.FileSystem/tests/File/ReadWriteAllLinesAsync.cs
@@ -76,6 +76,7 @@ public virtual async Task OverwriteAsync()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/40065", TestPlatforms.Browser)]
         public async Task OpenFile_ThrowsIOExceptionAsync()
         {
             string path = GetTestFilePath();
@@ -106,7 +107,7 @@ public async Task WriteToReadOnlyFile()
             try
             {
                 // Operation succeeds when being run by the Unix superuser
-                if (!OperatingSystem.IsWindows() && geteuid() == 0)
+                if (PlatformDetection.IsSuperUser)
                 {
                     await WriteAsync(path, new string[] { "text" });
                     Assert.Equal(new string[] { "text" }, await ReadAsync(path));

diff --git a/src/libraries/System.IO.FileSystem/tests/File/ReadWriteAllText.cs b/src/libraries/System.IO.FileSystem/tests/File/ReadWriteAllText.cs
@@ -85,6 +85,7 @@ public virtual void Overwrite()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/40065", TestPlatforms.Browser)]
         public void OpenFile_ThrowsIOException()
         {
             string path = GetTestFilePath();
@@ -118,7 +119,7 @@ public void WriteToReadOnlyFile()
             try
             {
                 // Operation succeeds when being run by the Unix superuser
-                if (!OperatingSystem.IsWindows() && geteuid() == 0)
+                if (PlatformDetection.IsSuperUser)
                 {
                     Write(path, "text");
                     Assert.Equal("text", Read(path));

diff --git a/src/libraries/System.IO.FileSystem/tests/File/ReadWriteAllTextAsync.cs b/src/libraries/System.IO.FileSystem/tests/File/ReadWriteAllTextAsync.cs
@@ -84,6 +84,7 @@ public virtual async Task OverwriteAsync()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/40065", TestPlatforms.Browser)]
         public async Task OpenFile_ThrowsIOExceptionAsync()
         {
             string path = GetTestFilePath();
@@ -114,7 +115,7 @@ public async Task WriteToReadOnlyFileAsync()
             try
             {
                 // Operation succeeds when being run by the Unix superuser
-                if (!OperatingSystem.IsWindows() && geteuid() == 0)
+                if (PlatformDetection.IsSuperUser)
                 {
                     await WriteAsync(path, "text");
                     Assert.Equal("text", await ReadAsync(path));

diff --git a/src/libraries/System.IO.FileSystem/tests/FileInfo/Exists.cs b/src/libraries/System.IO.FileSystem/tests/FileInfo/Exists.cs
@@ -91,7 +91,7 @@ public void FalseForDirectory()
         }
 
         [Fact]
-        [PlatformSpecific(TestPlatforms.AnyUnix)]  // Uses P/Invokes
+        [PlatformSpecific(TestPlatforms.AnyUnix & ~TestPlatforms.Browser)]  // Uses P/Invokes
         public void TrueForNonRegularFile()
         {
             string fileName = GetTestFilePath();

diff --git a/src/libraries/System.IO.FileSystem/tests/FileInfo/GetSetTimes.cs b/src/libraries/System.IO.FileSystem/tests/FileInfo/GetSetTimes.cs
@@ -104,6 +104,7 @@ public override IEnumerable<TimeFunction> TimeFunctions(bool requiresRoundtrippi
         }
 
         [ConditionalFact(nameof(isNotHFS))]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/40530", TestPlatforms.Browser)]
         public void CopyToMillisecondPresent()
         {
             FileInfo input = GetNonZeroMilliseconds();
@@ -118,6 +119,7 @@ public void CopyToMillisecondPresent()
         }
 
         [ConditionalFact(nameof(isNotHFS))]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/40530", TestPlatforms.Browser)]
         public void CopyToNanosecondsPresent()
         {
             FileInfo input = GetNonZeroNanoseconds();
@@ -160,6 +162,7 @@ public void MoveToMillisecondPresent_HFS()
         }
 
         [ConditionalFact(nameof(isNotHFS))]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/40530", TestPlatforms.Browser)]
         public void MoveToMillisecondPresent()
         {
             FileInfo input = GetNonZeroMilliseconds();

diff --git a/src/libraries/System.IO.FileSystem/tests/FileStream/CanSeek.cs b/src/libraries/System.IO.FileSystem/tests/FileStream/CanSeek.cs
@@ -43,6 +43,7 @@ public void CanSeekFalseForDisposedStream()
         }
 
         [Fact]
+        [PlatformSpecific(~TestPlatforms.Browser)] // IO.Pipes not supported
         public void CanSeekReturnsFalseForPipe()
         {
             using (var pipeStream = new AnonymousPipeServerStream())

diff --git a/src/libraries/System.IO.FileSystem/tests/FileStream/CopyToAsync.cs b/src/libraries/System.IO.FileSystem/tests/FileStream/CopyToAsync.cs
@@ -177,6 +177,7 @@ public static IEnumerable<object[]> File_AllDataCopied_MemberData()
 
         [Theory]
         [InlineData(10, 1024)]
+        [PlatformSpecific(~TestPlatforms.Browser)] // IO.Pipes not supported
         public async Task AnonymousPipeViaFileStream_AllDataCopied(int writeSize, int numWrites)
         {
             long totalLength = writeSize * numWrites;