Run on Windows only

Author: Youssef1313

src/NetAnalyzers/UnitTests/Microsoft.NetCore.Analyzers/Runtime/PreferStreamWriteAsyncMemoryOverloadsTests.cs

@@ -3,6 +3,7 @@
 using System.Collections.Generic;
 using System.Threading.Tasks;
 using Microsoft.CodeAnalysis.Testing;
+using Test.Utilities;
 using Xunit;
 
 #pragma warning disable CA1305 // Specify IFormatProvider in string.Format
@@ -566,7 +567,7 @@ public static IEnumerable<object[]> CSharpInlinedByteArrayTestData()
                                         "(new byte[]{ 0xBA, 0x5E, 0xBA, 0x11, 0xF0, 0x07, 0xBA, 0x11 }).AsMemory(0, 8), new CancellationToken()" };
         }
 
-        [Fact]
+        [WindowsOnlyFact] // https://github.com/dotnet/roslyn/issues/65081
         public Task CS_Fixer_Diagnostic_EnsureSystemNamespaceAutoAddedAsync()
         {
             string originalCode = @"
@@ -849,7 +850,7 @@ public static IEnumerable<object[]> VisualBasicInlinedByteArrayTestData()
                                         @"(New Byte() {&HBA, &H5E, &HBA, &H11, &HF0, &H07, &HBA, &H11}).AsMemory(0, 8), New CancellationToken()" };
         }
 
-        [Fact]
+        [WindowsOnlyFact] // https://github.com/dotnet/roslyn/issues/65081
         public Task VB_Fixer_Diagnostic_EnsureSystemNamespaceAutoAddedAsync()
         {
             string originalCode = @"
@@ -1137,4 +1138,4 @@ protected DiagnosticResult GetVisualBasicResult(int startLine, int startColumn,
 
         #endregion
     }
-}
+}