BinaryFormatter tests should be skipped only on AOT, WASM and Mobile

src/libraries/Common/tests/TestUtilities/System/PlatformDetection.cs

@@ -736,22 +736,8 @@ private static bool DetermineBinaryFormatterSupport()
                 return false;
             }
 
-            Assembly assembly = typeof(System.Runtime.Serialization.Formatters.Binary.BinaryFormatter).Assembly;
-            AssemblyName name = assembly.GetName();
-            Version assemblyVersion = name.Version;
-
-            bool isSupported = true;
-
-            // Version 8.1 is the version in the shared runtime (.NET 9+) that has the type disabled with no config.
-            // Assembly versions beyond 8.1 are the fully functional version from NuGet.
-            // Assembly versions before 8.1 probably won't be encountered, since that's the past.
-
-            if (assemblyVersion.Major == 8 && assemblyVersion.Minor == 1)
-            {
-                isSupported = false;
-            }
-
-            return isSupported;
+            return AppContext.TryGetSwitch("System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization", out bool isBinaryFormatterEnabled)
+                && isBinaryFormatterEnabled;
         }
     }
 }

src/libraries/Microsoft.Extensions.Hosting/tests/UnitTests/Microsoft.Extensions.Hosting.Unit.Tests.csproj

@@ -19,4 +19,11 @@
     <ProjectReference Include="$(LibrariesProjectRoot)Microsoft.Extensions.Hosting\src\Microsoft.Extensions.Hosting.csproj" />
   </ItemGroup>
 
+  <ItemGroup Condition="'$(TargetFrameworkIdentifier)' != '.NETFramework'">
+    <!-- Reference the `NetCoreAppMinimum` build which has a functional BinaryFormatter and force a private copy to ensure it's not excluded -->
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime.Serialization.Formatters\src\System.Runtime.Serialization.Formatters.csproj"
+                      Private="true"
+                      SetTargetFramework="TargetFramework=$(NetCoreAppMinimum)" />
+  </ItemGroup>
+
 </Project>

src/libraries/System.Collections.NonGeneric/tests/System.Collections.NonGeneric.Tests.csproj

@@ -44,5 +44,10 @@
     <Compile Include="CaseInsensitiveHashCodeProviderTests.cs" />
     <Compile Include="$(CommonTestPath)System\Collections\IEnumerable.NonGeneric.Serialization.Tests.cs"
              Link="Common\System\Collections\IEnumerable.NonGeneric.Serialization.Tests.cs" />
+
+    <!-- Reference the `NetCoreAppMinimum` build which has a functional BinaryFormatter and force a private copy to ensure it's not excluded -->
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime.Serialization.Formatters\src\System.Runtime.Serialization.Formatters.csproj"
+                      Private="true"
+                      SetTargetFramework="TargetFramework=$(NetCoreAppMinimum)" />
   </ItemGroup>
 </Project>

src/libraries/System.Collections.Specialized/tests/System.Collections.Specialized.Tests.csproj

@@ -75,5 +75,10 @@
     <Compile Include="$(CommonTestPath)System\Collections\IEnumerable.NonGeneric.Serialization.Tests.cs"
              Link="Common\System\Collections\IEnumerable.NonGeneric.Serialization.Tests.cs" />
     <Compile Include="NameObjectCollectionBase\NameObjectCollectionBase.ConstructorTests.cs" />
+
+    <!-- Reference the `NetCoreAppMinimum` build which has a functional BinaryFormatter and force a private copy to ensure it's not excluded -->
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime.Serialization.Formatters\src\System.Runtime.Serialization.Formatters.csproj"
+                      Private="true"
+                      SetTargetFramework="TargetFramework=$(NetCoreAppMinimum)" />
   </ItemGroup>
 </Project>

src/libraries/System.Collections/tests/Generic/Dictionary/Dictionary.Tests.cs

@@ -452,6 +452,13 @@ private static void TestComparerSerialization<T>(IEqualityComparer<T> equalityCo
             s.Position = 0;
             dict = (Dictionary<T, T>)bf.Deserialize(s);
 
+            if (equalityComparer.Equals(EqualityComparer<string>.Default))
+            {
+                // EqualityComparer<string>.Default is mapped to StringEqualityComparer, but serialized as GenericEqualityComparer<string>
+                Assert.Equal("System.Collections.Generic.GenericEqualityComparer`1[System.String]", dict.Comparer.GetType().ToString());
+                return;
+            }
+
             if (internalTypeName == null)
             {
                 Assert.IsType(equalityComparer.GetType(), dict.Comparer);

src/libraries/System.Collections/tests/Generic/HashSet/HashSet.Generic.Tests.cs

@@ -886,6 +886,13 @@ static void TestComparerSerialization<TCompared>(IEqualityComparer<TCompared> eq
                 s.Position = 0;
                 set = (HashSet<TCompared>)bf.Deserialize(s);
 
+                if (equalityComparer.Equals(EqualityComparer<string>.Default))
+                {
+                    // EqualityComparer<string>.Default is mapped to StringEqualityComparer, but serialized as GenericEqualityComparer<string>
+                    Assert.Equal("System.Collections.Generic.GenericEqualityComparer`1[System.String]", set.Comparer.GetType().ToString());
+                    return;
+                }
+
                 if (internalTypeName == null)
                 {
                     Assert.IsType(equalityComparer.GetType(), set.Comparer);

src/libraries/System.Collections/tests/System.Collections.Tests.csproj

@@ -4,6 +4,12 @@
     <TestRuntime>true</TestRuntime>
     <DebuggerSupport Condition="'$(DebuggerSupport)' == '' and ('$(TargetOS)' == 'browser' or '$(TargetOS)' == 'wasi')">true</DebuggerSupport>
   </PropertyGroup>
+  <ItemGroup>
+    <!-- Reference the `NetCoreAppMinimum` build which has a functional BinaryFormatter and force a private copy to ensure it's not excluded -->
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime.Serialization.Formatters\src\System.Runtime.Serialization.Formatters.csproj"
+                      Private="true"
+                      SetTargetFramework="TargetFramework=$(NetCoreAppMinimum)" />
+  </ItemGroup>
   <ItemGroup>
     <RdXmlFile Include="default.rd.xml" />
   </ItemGroup>

src/libraries/System.ComponentModel.Annotations/tests/System.ComponentModel.Annotations.Tests.csproj

@@ -48,5 +48,10 @@
     <Compile Include="System\ComponentModel\DataAnnotations\ValidationResultTests.cs" />
     <Compile Include="System\ComponentModel\DataAnnotations\ValidatorTests.cs" />
     <Compile Include="System\ComponentModel\DataAnnotations\DeniedValuesAttributeTests.cs" />
+
+    <!-- Reference the `NetCoreAppMinimum` build which has a functional BinaryFormatter and force a private copy to ensure it's not excluded -->
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime.Serialization.Formatters\src\System.Runtime.Serialization.Formatters.csproj"
+                      Private="true"
+                      SetTargetFramework="TargetFramework=$(NetCoreAppMinimum)" />
   </ItemGroup>
 </Project>

src/libraries/System.ComponentModel.Primitives/tests/System.ComponentModel.Primitives.Tests.csproj

@@ -26,5 +26,10 @@
     <Compile Include="System\ComponentModel\ParenthesizePropertyNameAttributeTests.cs" />
     <Compile Include="System\ComponentModel\ReadOnlyAttributeTests.cs" />
     <Compile Include="System\ComponentModel\RefreshPropertiesAttributeTests.cs" />
+
+    <!-- Reference the `NetCoreAppMinimum` build which has a functional BinaryFormatter and force a private copy to ensure it's not excluded -->
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime.Serialization.Formatters\src\System.Runtime.Serialization.Formatters.csproj"
+                      Private="true"
+                      SetTargetFramework="TargetFramework=$(NetCoreAppMinimum)" />
   </ItemGroup>
 </Project>

src/libraries/System.ComponentModel.TypeConverter/tests/System.ComponentModel.TypeConverter.Tests.csproj

@@ -166,6 +166,10 @@
   <ItemGroup>
     <PackageReference Include="System.ComponentModel.TypeConverter.TestData" Version="$(SystemComponentModelTypeConverterTestDataVersion)" />
     <PackageReference Include="Moq" Version="$(MoqVersion)" />
+    <!-- Reference the `NetCoreAppMinimum` build which has a functional BinaryFormatter and force a private copy to ensure it's not excluded -->
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime.Serialization.Formatters\src\System.Runtime.Serialization.Formatters.csproj"
+                      Private="true"
+                      SetTargetFramework="TargetFramework=$(NetCoreAppMinimum)" />
   </ItemGroup>
   <ItemGroup>
     <EmbeddedResource Include="Resources\TestResx.resx">

src/libraries/System.Configuration.ConfigurationManager/tests/System.Configuration.ConfigurationManager.Tests.csproj

@@ -107,4 +107,10 @@
     <!-- Manually reference the transitive dependency to make NuGet pick the package over the transitive project: https://github.com/NuGet/Home/issues/10368 -->
     <PackageReference Include="System.Security.Principal.Windows" Version="$(SystemSecurityPrincipalWindowsVersion)" PrivateAssets="all" />
   </ItemGroup>
+  <ItemGroup Condition="'$(TargetFrameworkIdentifier)' != '.NETFramework'">
+    <!-- Reference the `NetCoreAppMinimum` build which has a functional BinaryFormatter and force a private copy to ensure it's not excluded -->
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime.Serialization.Formatters\src\System.Runtime.Serialization.Formatters.csproj"
+                      Private="true"
+                      SetTargetFramework="TargetFramework=$(NetCoreAppMinimum)" />
+  </ItemGroup>
 </Project>

src/libraries/System.Data.Common/tests/System.Data.Common.Tests.csproj

@@ -118,6 +118,11 @@
              Link="Common\System\Diagnostics\Tracing\TestEventListener.cs" />
     <Compile Include="$(CommonTestPath)System\Runtime\Serialization\Formatters\BinaryFormatterHelpers.cs"
              Link="Common\System\Runtime\Serialization\Formatters\BinaryFormatterHelpers.cs" />
+
+    <!-- Reference the `NetCoreAppMinimum` build which has a functional BinaryFormatter and force a private copy to ensure it's not excluded -->
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime.Serialization.Formatters\src\System.Runtime.Serialization.Formatters.csproj"
+                      Private="true"
+                      SetTargetFramework="TargetFramework=$(NetCoreAppMinimum)" />
   </ItemGroup>
   <!-- S.D.SqlClient isn't live built anymore. -->
   <ItemGroup>

src/libraries/System.Net.Requests/tests/System.Net.Requests.Tests.csproj

@@ -53,5 +53,9 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="System.Net.TestData" Version="$(SystemNetTestDataVersion)" />
+    <!-- Reference the `NetCoreAppMinimum` build which has a functional BinaryFormatter and force a private copy to ensure it's not excluded -->
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime.Serialization.Formatters\src\System.Runtime.Serialization.Formatters.csproj"
+                      Private="true"
+                      SetTargetFramework="TargetFramework=$(NetCoreAppMinimum)" />
   </ItemGroup>
 </Project>

src/libraries/System.Net.Security/tests/FunctionalTests/System.Net.Security.Tests.csproj

@@ -165,5 +165,9 @@
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="$(CommonTestPath)StreamConformanceTests\StreamConformanceTests.csproj" />
+    <!-- Reference the `NetCoreAppMinimum` build which has a functional BinaryFormatter and force a private copy to ensure it's not excluded -->
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime.Serialization.Formatters\src\System.Runtime.Serialization.Formatters.csproj"
+                      Private="true"
+                      SetTargetFramework="TargetFramework=$(NetCoreAppMinimum)" />
   </ItemGroup>
 </Project>

src/libraries/System.ObjectModel/tests/System.ObjectModel.Tests.csproj

@@ -42,5 +42,10 @@
     <Compile Include="ReadOnlyObservableCollection\ReadOnlyObservableCollection_SerializationTests.cs" />
     <Compile Include="$(CommonTestPath)System\Runtime\Serialization\Formatters\BinaryFormatterHelpers.cs"
              Link="Common\System\Runtime\Serialization\Formatters\BinaryFormatterHelpers.cs" />
+
+    <!-- Reference the `NetCoreAppMinimum` build which has a functional BinaryFormatter and force a private copy to ensure it's not excluded -->
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime.Serialization.Formatters\src\System.Runtime.Serialization.Formatters.csproj"
+                      Private="true"
+                      SetTargetFramework="TargetFramework=$(NetCoreAppMinimum)" />
   </ItemGroup>
 </Project>

src/libraries/System.Reflection.Metadata/tests/System.Reflection.Metadata.Tests.csproj

@@ -152,6 +152,12 @@
   <ItemGroup Condition="'$(TargetFrameworkIdentifier)' == '.NETFramework'">
     <PackageReference Include="System.ValueTuple" Version="$(SystemValueTupleVersion)" />
   </ItemGroup>
+  <ItemGroup Condition="'$(TargetFrameworkIdentifier)' != '.NETFramework'">
+    <!-- Reference the `NetCoreAppMinimum` build which has a functional BinaryFormatter and force a private copy to ensure it's not excluded -->
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime.Serialization.Formatters\src\System.Runtime.Serialization.Formatters.csproj"
+                      Private="true"
+                      SetTargetFramework="TargetFramework=$(NetCoreAppMinimum)" />
+  </ItemGroup>
 
   <ItemGroup Condition="'$(TargetOS)' == 'browser'">
     <WasmFilesToIncludeFromPublishDir Include="$(AssemblyName).dll" />

src/libraries/System.Runtime.Serialization.Primitives/tests/System.Runtime.Serialization.Primitives.Tests.csproj

@@ -11,5 +11,10 @@
     <Compile Include="System\Runtime\Serialization\IgnoreDataMemberAttributeTests.cs" />
     <Compile Include="System\Runtime\Serialization\InvalidDataContractExceptionTests.cs" />
     <Compile Include="System\Runtime\Serialization\KnownTypeAttributeTests.cs" />
+
+    <!-- Reference the `NetCoreAppMinimum` build which has a functional BinaryFormatter and force a private copy to ensure it's not excluded -->
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime.Serialization.Formatters\src\System.Runtime.Serialization.Formatters.csproj"
+                      Private="true"
+                      SetTargetFramework="TargetFramework=$(NetCoreAppMinimum)" />
   </ItemGroup>
 </Project>

src/libraries/System.Runtime/tests/System.Resources.ResourceManager.Tests/System.Resources.ResourceManager.Tests.csproj

@@ -61,6 +61,10 @@
     <PackageReference Include="System.Drawing.Common" Version="$(SystemDrawingCommonVersion)" />
     <!--Reference to System.Resources.Extensions is required in order to be able to embed a resource that requires a custom reader-->
     <ProjectReference Include="$(LibrariesProjectRoot)System.Resources.Extensions\src\System.Resources.Extensions.csproj" />
+    <!-- Reference the `NetCoreAppMinimum` build which has a functional BinaryFormatter and force a private copy to ensure it's not excluded -->
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime.Serialization.Formatters\src\System.Runtime.Serialization.Formatters.csproj"
+                      Private="true"
+                      SetTargetFramework="TargetFramework=$(NetCoreAppMinimum)" />
   </ItemGroup>
   <!--
     MSBuild on .NET Core doesn't support non-string resources. See https://github.com/Microsoft/msbuild/issues/2221

src/libraries/System.Runtime/tests/System.Runtime.Tests/System.Runtime.Tests.csproj

@@ -370,5 +370,9 @@
     <!-- Used during reflection in tests. -->
     <ProjectReference Include="$(LibrariesProjectRoot)System.Security.Permissions\src\System.Security.Permissions.csproj" />
     <ProjectReference Include="$(LibrariesProjectRoot)System.Threading.AccessControl\src\System.Threading.AccessControl.csproj" />
+    <!-- Reference the `NetCoreAppMinimum` build which has a functional BinaryFormatter and force a private copy to ensure it's not excluded -->
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime.Serialization.Formatters\src\System.Runtime.Serialization.Formatters.csproj"
+                      Private="true"
+                      SetTargetFramework="TargetFramework=$(NetCoreAppMinimum)" />
   </ItemGroup>
 </Project>

src/libraries/System.Security.Cryptography/tests/System.Security.Cryptography.Tests.csproj

@@ -519,5 +519,9 @@
     <ProjectReference Include="$(CommonTestPath)StreamConformanceTests\StreamConformanceTests.csproj" />
     <ProjectReference Include="$(LibrariesProjectRoot)System.Security.Cryptography.Pkcs\src\System.Security.Cryptography.Pkcs.csproj" />
     <PackageReference Include="System.Security.Cryptography.X509Certificates.TestData" Version="$(SystemSecurityCryptographyX509CertificatesTestDataVersion)" />
+    <!-- Reference the `NetCoreAppMinimum` build which has a functional BinaryFormatter and force a private copy to ensure it's not excluded -->
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime.Serialization.Formatters\src\System.Runtime.Serialization.Formatters.csproj"
+                      Private="true"
+                      SetTargetFramework="TargetFramework=$(NetCoreAppMinimum)" />
   </ItemGroup>
 </Project>

src/libraries/System.Text.RegularExpressions/tests/FunctionalTests/System.Text.RegularExpressions.Tests.csproj

@@ -85,6 +85,11 @@
                       SetTargetFramework="TargetFramework=netstandard2.0"
                       OutputItemType="Analyzer"
                       ReferenceOutputAssembly="true" />
+
+    <!-- Reference the `NetCoreAppMinimum` build which has a functional BinaryFormatter and force a private copy to ensure it's not excluded -->
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime.Serialization.Formatters\src\System.Runtime.Serialization.Formatters.csproj"
+                      Private="true"
+                      SetTargetFramework="TargetFramework=$(NetCoreAppMinimum)" />
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="System.Text.RegularExpressions.TestData" Version="$(SystemTextRegularExpressionsTestDataVersion)" />

src/libraries/System.Threading.Channels/tests/System.Threading.Channels.Tests.csproj

@@ -17,6 +17,10 @@
   <ItemGroup Condition="'$(TargetFramework)' == '$(NetCoreAppCurrent)'">
     <Compile Include="ChannelClosedExceptionTests.netcoreapp.cs"  />
     <Compile Include="PriorityUnboundedChannelTests.cs" />
+    <!-- Reference the `NetCoreAppMinimum` build which has a functional BinaryFormatter and force a private copy to ensure it's not excluded -->
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime.Serialization.Formatters\src\System.Runtime.Serialization.Formatters.csproj"
+                      Private="true"
+                      SetTargetFramework="TargetFramework=$(NetCoreAppMinimum)" />
   </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)' == '$(NetFrameworkMinimum)'">
     <ProjectReference Include="..\src\System.Threading.Channels.csproj" />