Use TargetFramework singular for tests

Use TargetFramework instead of TargetFrameworks property whenever a
test project targets a single target framework only.
This avoid unnecessary outer builds and evaluations and makes the build
faster.

src/libraries/Common/tests/AndroidTestRunner/AndroidTestRunner.csproj

@@ -2,7 +2,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <Nullable>enable</Nullable>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="AndroidTestRunner.cs" />

src/libraries/Common/tests/AppleTestRunner/AppleTestRunner.csproj

@@ -2,7 +2,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <Nullable>enable</Nullable>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="AppleTestRunner.cs" />

src/libraries/Common/tests/StreamConformanceTests/StreamConformanceTests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="System\IO\*.cs" />

src/libraries/Common/tests/System/Xml/XmlCoreTest/XmlCoreTest.csproj

@@ -2,7 +2,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <RootNamespace>XmlCoreTest.Common</RootNamespace>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="AsyncUtil.cs" />

src/libraries/Common/tests/TestUtilities.Unicode/TestUtilities.Unicode.csproj

@@ -2,7 +2,7 @@
   <PropertyGroup>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <UnicodeUcdVersion>13.0</UnicodeUcdVersion>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="System\Text\Unicode\UnicodeData.cs" />

src/libraries/Common/tests/WasmTestRunner/WasmTestRunner.csproj

@@ -2,7 +2,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <Nullable>enable</Nullable>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="WasmTestRunner.cs" />

src/libraries/Microsoft.Diagnostics.Tracing.EventSource.Redist/src/Microsoft.Diagnostics.Tracing.EventSource.Redist.csproj

@@ -10,7 +10,7 @@ Microsoft.Diagnostics.Tracing.EventSource</PackageDescription>
     <PackageId>$(MSBuildProjectName)</PackageId>
     <AssemblyName>Microsoft.Diagnostics.Tracing.EventSource</AssemblyName>
     <DefineConstants>$(DefineConstants);NO_EVENTCOMMANDEXECUTED_SUPPORT;ES_BUILD_STANDALONE;FEATURE_MANAGED_ETW;TARGET_WINDOWS</DefineConstants>
-    <TargetFrameworks>$(NetFrameworkMinimum)</TargetFrameworks>
+    <TargetFramework>$(NetFrameworkMinimum)</TargetFramework>
     <Nullable>enable</Nullable>
     <IncludePlatformAttributes>true</IncludePlatformAttributes>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>

src/libraries/Microsoft.Diagnostics.Tracing.EventSource.Redist/tests/Microsoft.Diagnostics.Tracing.EventSource.Redist.Tests.csproj

@@ -2,7 +2,7 @@
   <PropertyGroup>
     <DefineConstants>$(DefineConstants);USE_MDT_EVENTSOURCE</DefineConstants>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
-    <TargetFrameworks>$(NetFrameworkMinimum)</TargetFrameworks>
+    <TargetFramework>$(NetFrameworkMinimum)</TargetFramework>
   </PropertyGroup>
   <PropertyGroup>
     <SDTTestDir>..\..\System.Diagnostics.Tracing\tests</SDTTestDir>

src/libraries/Microsoft.Extensions.Hosting.Systemd/tests/Microsoft.Extensions.Hosting.Systemd.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
     <EnableDefaultItems>true</EnableDefaultItems>
   </PropertyGroup>
 

src/libraries/Microsoft.Extensions.Logging.Abstractions/tests/Microsoft.Extensions.Logging.Generators.Tests/Microsoft.Extensions.Logging.Generators.targets

@@ -1,7 +1,7 @@
 <Project>
 
   <PropertyGroup>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
     <EnableDefaultItems>true</EnableDefaultItems>
     <EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
     <Nullable>enable</Nullable>

src/libraries/Microsoft.NETCore.Platforms/src/Microsoft.NETCore.Platforms.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>$(NetCoreAppToolCurrent);$(NetFrameworkToolCurrent)</TargetFrameworks>
-    <UseTargetFrameworkPackage>false</UseTargetFrameworkPackage>
+    <EnableBinPlacing>false</EnableBinPlacing>
     <!-- This project should not build against the live built .NETCoreApp targeting pack as it contributes to the build itself. -->
     <UseLocalTargetingRuntimePack>false</UseLocalTargetingRuntimePack>
     <AssemblyName>Microsoft.NETCore.Platforms.BuildTasks</AssemblyName>

src/libraries/Microsoft.XmlSerializer.Generator/tests/Microsoft.XmlSerializer.Generator.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <DefineConstants>$(DefineConstants);XMLSERIALIZERGENERATORTESTS</DefineConstants>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
     <SkipTestsOnPlatform Condition="'$(TargetsMobile)' == 'true' or '$(TargetOS)' == 'FreeBSD' or '$(TargetArchitecture)' == 'arm' or '$(TargetArchitecture)' == 'arm64' or '$(TargetArchitecture)' == 'armel' or '$(TargetArchitecture)' == 'wasm'">true</SkipTestsOnPlatform>
   </PropertyGroup>
 

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

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
     <TestRuntime>true</TestRuntime>
   </PropertyGroup>
   <ItemGroup>

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

@@ -3,7 +3,7 @@
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <TestRuntime>true</TestRuntime>
     <IncludeRemoteExecutor>true</IncludeRemoteExecutor>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="ArrayPool\ArrayPoolTest.cs" />

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

@@ -2,7 +2,7 @@
   <PropertyGroup>
     <TestRuntime>true</TestRuntime>
     <IncludeRemoteExecutor>true</IncludeRemoteExecutor>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
     <DebuggerSupport Condition="'$(DebuggerSupport)' == '' and '$(TargetOS)' == 'Browser'">true</DebuggerSupport>
   </PropertyGroup>
   <ItemGroup>

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

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <IncludeRemoteExecutor>true</IncludeRemoteExecutor>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
     <DebuggerSupport Condition="'$(DebuggerSupport)' == '' and '$(TargetOS)' == 'Browser'">true</DebuggerSupport>
   </PropertyGroup>
   <ItemGroup>

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

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <!-- Common Collections tests -->

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

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
     <TestRuntime>true</TestRuntime>
     <DebuggerSupport Condition="'$(DebuggerSupport)' == '' and '$(TargetOS)' == 'Browser'">true</DebuggerSupport>
   </PropertyGroup>

src/libraries/System.ComponentModel.Composition.Registration/tests/System.ComponentModel.Composition.Registration.Tests.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
     <!-- Disable nullable attributes explicitly as some tests depend on them not being present. -->
     <Nullable>disable</Nullable>
   </PropertyGroup>

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

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <IncludeRemoteExecutor>true</IncludeRemoteExecutor>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="$(CommonTestPath)System\IO\TempDirectory.cs"

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

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <IncludeRemoteExecutor>true</IncludeRemoteExecutor>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="AsyncOperationManagerTests.cs" />

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

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="System\ComponentModel\BrowsableAttributeTests.cs" />

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

@@ -4,7 +4,7 @@
     <IncludeRemoteExecutor>true</IncludeRemoteExecutor>
     <RootNamespace />
     <AssemblyVersion>9.9.9.9</AssemblyVersion>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="Drawing\ColorConverterTests.cs" />

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

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="CancelEventArgsTests.cs" />

src/libraries/System.Console/tests/ManualTests/System.Console.Manual.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="ManualTests.cs" />

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

@@ -2,8 +2,7 @@
   <PropertyGroup>
     <NoWarn>$(NoWarn),0168,0169,0414,0219,0649</NoWarn>
     <IncludeRemoteExecutor>true</IncludeRemoteExecutor>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
-    <IncludeRemoteExecutor>true</IncludeRemoteExecutor>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="System\Data\Common\DataColumnMappingTest.cs" />

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

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="Mono\DataRowComparerTest.cs" />

src/libraries/System.Diagnostics.Contracts/tests/System.Diagnostics.Contracts.Tests.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
     <TestRuntime>true</TestRuntime>
   </PropertyGroup>
   <ItemGroup>

src/libraries/System.Diagnostics.DiagnosticSource/tests/TestWithConfigSwitches/System.Diagnostics.DiagnosticSource.Switches.Tests.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
     <TestRuntime>true</TestRuntime>
   </PropertyGroup>
   <ItemGroup>

src/libraries/System.Diagnostics.FileVersionInfo/tests/System.Diagnostics.FileVersionInfo.TestAssembly/System.Diagnostics.FileVersionInfo.TestAssembly.csproj

@@ -2,7 +2,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="Assembly1.cs" />

src/libraries/System.Diagnostics.Process/tests/LongPath/LongPath.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="ClassDefinedInAssemblyWithAVeryLongPath.cs" />

src/libraries/System.Diagnostics.StackTrace/tests/System.Diagnostics.StackTrace.Tests.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
     <TestRuntime>true</TestRuntime>
     <IncludeRemoteExecutor>true</IncludeRemoteExecutor>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>

src/libraries/System.Diagnostics.TextWriterTraceListener/tests/System.Diagnostics.TextWriterTraceListener.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <IncludeRemoteExecutor>true</IncludeRemoteExecutor>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="CommonUtilities.cs" />

src/libraries/System.Diagnostics.Tools/tests/System.Diagnostics.Tools.Tests.csproj

@@ -2,7 +2,7 @@
   <PropertyGroup>
     <RootNamespace>System</RootNamespace>
     <AssemblyName>System.Diagnostics.Tools.Tests</AssemblyName>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
     <TestRuntime>true</TestRuntime>
   </PropertyGroup>
   <ItemGroup>

src/libraries/System.Diagnostics.TraceSource/tests/System.Diagnostics.TraceSource.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <IncludeRemoteExecutor>true</IncludeRemoteExecutor>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="AssemblyInfo.cs" />

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

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
     <DebuggerSupport Condition="'$(DebuggerSupport)' == '' and '$(TargetOS)' == 'Browser'">true</DebuggerSupport>
   </PropertyGroup>
   <ItemGroup>

src/libraries/System.Formats.Cbor/tests/CborDocument/System.Formats.Cbor.Tests.DataModel.fsproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
     <!-- NuGet restore issue with TargetFrameworks in f# projects: https://github.com/NuGet/Home/issues/10005 -->
     <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
   </PropertyGroup>

src/libraries/System.Globalization.Calendars/tests/CalendarTestWithConfigSwitch/System.Globalization.CalendarsWithConfigSwitch.Tests.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
     <TestRuntime>true</TestRuntime>
   </PropertyGroup>
   <ItemGroup>

src/libraries/System.Globalization.Calendars/tests/System.Globalization.Calendars.Tests.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
     <TestRuntime>true</TestRuntime>
   </PropertyGroup>
   <ItemGroup>

src/libraries/System.Globalization.Extensions/tests/System.Globalization.Extensions.Tests.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
     <TestRuntime>true</TestRuntime>
   </PropertyGroup>
   <ItemGroup>

src/libraries/System.Globalization/tests/Invariant/Invariant.Tests.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
     <TestRuntime>true</TestRuntime>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <InvariantGlobalization>true</InvariantGlobalization>

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

@@ -3,7 +3,7 @@
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <TestRuntime>true</TestRuntime>
     <IncludeRemoteExecutor>true</IncludeRemoteExecutor>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
     <UnicodeUcdVersion>13.0</UnicodeUcdVersion>
   </PropertyGroup>
   <ItemGroup>

src/libraries/System.IO.FileSystem.Primitives/tests/System.IO.FileSystem.Primitives.Tests.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
     <TestRuntime>true</TestRuntime>
   </PropertyGroup>
   <ItemGroup>

src/libraries/System.IO.FileSystem/tests/ManualTests/System.IO.FileSystem.Manual.Tests.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="ManualTests.cs" />

src/libraries/System.IO.UnmanagedMemoryStream/tests/System.IO.UnmanagedMemoryStream.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
     <TestRuntime>true</TestRuntime>
   </PropertyGroup>
   <ItemGroup>

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

@@ -4,7 +4,7 @@
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <TestRuntime>true</TestRuntime>
     <IncludeRemoteExecutor>true</IncludeRemoteExecutor>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="IndentedTextWriter.cs" />