chore: fix build warnings

.devcontainer/devcontainer.json

@@ -4,8 +4,5 @@
     "settings": {
         "terminal.integrated.shell.linux": "/bin/bash"
     },
-    "extensions": [
-        "ms-dotnettools.csharp"
-    ],
     "postCreateCommand": "dotnet restore"
 }

.vscode/extensions.json

@@ -0,0 +1,6 @@
+{
+    "recommendations": [
+        "ms-vscode-remote.remote-containers",
+        "ms-dotnettools.csharp"
+    ]
+}

Directory.Build.props

@@ -7,6 +7,7 @@
     <AssemblyOriginatorKeyFile>$(MSBuildThisFileDirectory)StrongName.snk</AssemblyOriginatorKeyFile>
     <IncludeSymbols>true</IncludeSymbols>
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <LangVersion>9.0</LangVersion>
     <PackageTags>testing</PackageTags>
     <PackageProjectUrl>https://github.com/System-IO-Abstractions/System.IO.Abstractions</PackageProjectUrl>

nuget.config

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <packageSources>
+    <clear />
+    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
+  </packageSources>
+</configuration>

src/System.IO.Abstractions/Properties/AssemblyInfo.cs

@@ -5,11 +5,9 @@
 
 #if DEBUG
 [assembly: InternalsVisibleTo("System.IO.Abstractions.Tests")]
-[assembly: InternalsVisibleTo("System.IO.Abstractions.TestingHelpers.Tests")]
 [assembly: InternalsVisibleTo("DynamicProxyGenAssembly2")]
 #else
 [assembly: InternalsVisibleTo("System.IO.Abstractions.Tests, PublicKey=00240000048000009400000006020000002400005253413100040000010001001160c7a0f907c400c5392975b66d2f3752fb82625d5674d386b83896d4d4ae8d0ef8319ef391fbb3466de0058ad2f361b8f5cb8a32ecb4e908bece5c519387552cedd2ca0250e36b59c6d6dc3dc260ca73a7e27c3add4ae22d5abaa562225d7ba34d427e8f3f52928a46a674deb0208eca7d379aa22712355b91a55a5ce521d2")]
-[assembly: InternalsVisibleTo("System.IO.Abstractions.TestingHelpers.Tests, PublicKey=00240000048000009400000006020000002400005253413100040000010001001160c7a0f907c400c5392975b66d2f3752fb82625d5674d386b83896d4d4ae8d0ef8319ef391fbb3466de0058ad2f361b8f5cb8a32ecb4e908bece5c519387552cedd2ca0250e36b59c6d6dc3dc260ca73a7e27c3add4ae22d5abaa562225d7ba34d427e8f3f52928a46a674deb0208eca7d379aa22712355b91a55a5ce521d2")]
 [assembly: InternalsVisibleTo("DynamicProxyGenAssembly2,PublicKey=0024000004800000940000000602000000240000525341310004000001000100c547cac37abd99c8db225ef2f6c8a3602f3b3606cc9891605d02baa56104f4cfc0734aa39b93bf7852f7d9266654753cc297e7d2edfe0bac1cdcf9f717241550e0a7b191195b7667bb4f64bcb8e2121380fd1d9d46ad2d92d2d15605093924cceaf74c4861eff62abf69b9291ed0a340e113be11e6a7d3113e92484cf7045cc7")]
 #endif
 

tests/System.IO.Abstractions.TestingHelpers.Tests/MockDirectoryArgumentPathTests.cs

@@ -12,7 +12,11 @@ private static IEnumerable<Action<IDirectory>> GetFileSystemActionsForArgumentNu
             yield return ds => ds.Delete(null, true);
             yield return ds => ds.CreateDirectory(null);
             if (MockUnixSupport.IsWindowsPlatform())
+            {
+                #pragma warning disable CA1416
                 yield return ds => ds.CreateDirectory(null, new DirectorySecurity());
+                #pragma warning restore CA1416
+            }
             yield return ds => ds.SetCreationTime(null, DateTime.Now);
             yield return ds => ds.SetCreationTimeUtc(null, DateTime.Now);
             yield return ds => ds.SetLastAccessTime(null, DateTime.Now);

tests/System.IO.Abstractions.TestingHelpers.Tests/MockDirectoryGetAccessControlTests.cs

@@ -1,15 +1,14 @@
 using NUnit.Framework;
-using System;
 using System.Collections.Generic;
-using System.Linq;
-using System.Text;
 using System.Security.AccessControl;
+using System.Runtime.Versioning;
 
 namespace System.IO.Abstractions.TestingHelpers.Tests
 {
     using XFS = MockUnixSupport;
     [TestFixture]
     [WindowsOnly(WindowsSpecifics.AccessControlLists)]
+    [SupportedOSPlatform("windows")]
     public class MockDirectoryGetAccessControlTests
     {
         [TestCase(" ")]

tests/System.IO.Abstractions.TestingHelpers.Tests/MockDirectoryInfoAccessControlTests.cs

@@ -1,12 +1,14 @@
 using NUnit.Framework;
 using System.Collections.Generic;
+using System.Runtime.Versioning;
 using System.Security.AccessControl;
 using XFS = System.IO.Abstractions.TestingHelpers.MockUnixSupport;
 
 namespace System.IO.Abstractions.TestingHelpers.Tests
 {
     [TestFixture]
     [WindowsOnly(WindowsSpecifics.AccessControlLists)]
+    [SupportedOSPlatform("windows")]
     public class MockDirectoryInfoAccessControlTests
     {
         [Test]

tests/System.IO.Abstractions.TestingHelpers.Tests/MockDirectorySetAccessControlTests.cs

@@ -1,15 +1,14 @@
 using NUnit.Framework;
-using System;
 using System.Collections.Generic;
-using System.Linq;
-using System.Text;
 
 namespace System.IO.Abstractions.TestingHelpers.Tests
 {
+    using System.Runtime.Versioning;
     using Security.AccessControl;
     using XFS = MockUnixSupport;
 
     [TestFixture]
+    [SupportedOSPlatform("windows")]
     [WindowsOnly(WindowsSpecifics.AccessControlLists)]
     public class MockDirectorySetAccessControlTests
     {

tests/System.IO.Abstractions.TestingHelpers.Tests/MockFileGetAccessControlTests.cs

@@ -1,15 +1,14 @@
 using NUnit.Framework;
-using System;
 using System.Collections.Generic;
-using System.Linq;
-using System.Text;
 using System.Security.AccessControl;
+using System.Runtime.Versioning;
 
 namespace System.IO.Abstractions.TestingHelpers.Tests
 {
     using XFS = MockUnixSupport;
     [TestFixture]
     [WindowsOnly(WindowsSpecifics.AccessControlLists)]
+    [SupportedOSPlatform("windows")]
     public class MockFileGetAccessControlTests
     {
         [TestCase(" ")]

tests/System.IO.Abstractions.TestingHelpers.Tests/MockFileInfoAccessControlTests.cs

@@ -1,12 +1,14 @@
 using NUnit.Framework;
 using System.Collections.Generic;
+using System.Runtime.Versioning;
 using System.Security.AccessControl;
 using XFS = System.IO.Abstractions.TestingHelpers.MockUnixSupport;
 
 namespace System.IO.Abstractions.TestingHelpers.Tests
 {
     [TestFixture]
     [WindowsOnly(WindowsSpecifics.AccessControlLists)]
+    [SupportedOSPlatform("windows")]
     public class MockFileInfoAccessControlTests
     {
         [Test]

tests/System.IO.Abstractions.TestingHelpers.Tests/MockFileSetAccessControlTests.cs

@@ -1,12 +1,14 @@
 using NUnit.Framework;
 using System.Collections.Generic;
+using System.Runtime.Versioning;
 using System.Security.AccessControl;
 using XFS = System.IO.Abstractions.TestingHelpers.MockUnixSupport;
 
 namespace System.IO.Abstractions.TestingHelpers.Tests
 {
     [TestFixture]
     [WindowsOnly(WindowsSpecifics.AccessControlLists)]
+    [SupportedOSPlatform("windows")]
     public class MockFileSetAccessControlTests
     {
         [TestCase(" ")]

tests/System.IO.Abstractions.TestingHelpers.Tests/MockFileSystemSerializationTests.cs

@@ -23,10 +23,13 @@ public void SerializationBytes()
             //Act
             var memoryStream = new MemoryStream();
             var serializer = new Runtime.Serialization.Formatters.Binary.BinaryFormatter();
+
+#pragma warning disable SYSLIB0011
             serializer.Serialize(memoryStream, fileSystem);
             memoryStream.Flush();
             memoryStream.Position = 0; 
             fileSystem = (MockFileSystem)serializer.Deserialize(memoryStream);
+#pragma warning restore SYSLIB0011
             memoryStream.Dispose();
 
             // Assert

tests/System.IO.Abstractions.TestingHelpers.Tests/MockFileSystemTests.cs

@@ -131,7 +131,10 @@ public void MockFileSystem_ByDefault_IsSerializable()
             var memoryStream = new MemoryStream();
 
             var serializer = new Runtime.Serialization.Formatters.Binary.BinaryFormatter();
+
+#pragma warning disable SYSLIB0011
             serializer.Serialize(memoryStream, fileSystem);
+#pragma warning restore SYSLIB0011
 
             Assert.That(memoryStream.Length > 0, "Length didn't increase after serialization task.");
         }

tests/System.IO.Abstractions.TestingHelpers.Tests/MockFileTests.cs

@@ -543,7 +543,10 @@ public void Serializable_works()
             //Act
             IFormatter formatter = new BinaryFormatter();
             Stream stream = new MemoryStream();
+
+#pragma warning disable SYSLIB0011
             formatter.Serialize(stream, data);
+#pragma warning restore SYSLIB0011
 
             //Assert
             Assert.Pass();
@@ -560,11 +563,13 @@ public void Serializable_can_deserialize()
 
             IFormatter formatter = new BinaryFormatter();
             Stream stream = new MemoryStream();
+#pragma warning disable SYSLIB0011
             formatter.Serialize(stream, data);
 
             stream.Seek(0, SeekOrigin.Begin);
 
             MockFileData deserialized = (MockFileData)formatter.Deserialize(stream);
+#pragma warning restore SYSLIB0011
 
             //Assert
             Assert.That(deserialized.TextContents, Is.EqualTo(textContentStr));

tests/System.IO.Abstractions.TestingHelpers.Tests/MockFileWriteAllTextTests.cs

@@ -165,10 +165,12 @@ public static IEnumerable<KeyValuePair<Encoding, byte[]>> GetEncodingsWithExpect
                     101, 0, 0, 0, 33, 0, 0, 0, 32, 0, 0, 0, 68, 0, 0, 0, 122, 0,
                     0, 0, 105, 0, 0, 0, 25, 1, 0, 0, 107, 0, 0, 0, 105, 0, 0, 0, 46, 0, 0, 0 } },
 
+#pragma warning disable SYSLIB0001
                 // UTF-7 does not need a BOM
                 { Encoding.UTF7, new byte [] {72, 101, 108, 108, 111, 32, 116,
                     104, 101, 114, 101, 43, 65, 67, 69, 45, 32, 68, 122, 105,
                     43, 65, 82, 107, 45, 107, 105, 46 } },
+#pragma warning restore SYSLIB0001
 
                 // The default encoding does not need a BOM
                 { utf8WithoutBom, new byte [] { 72, 101, 108, 108, 111, 32, 116,