Fix xunit analyzers to run on library test projects

src/libraries/Directory.Build.props

@@ -225,7 +225,8 @@
     <CheckForOverflowUnderflow>false</CheckForOverflowUnderflow>
     <GenFacadesIgnoreBuildAndRevisionMismatch>true</GenFacadesIgnoreBuildAndRevisionMismatch>
     <!-- Disable analyzers for tests and unsupported projects -->
-    <RunAnalyzers Condition="'$(IsSourceProject)' != 'true' or '$(MSBuildProjectExtension)' == '.ilproj'">false</RunAnalyzers>
+    <RunAnalyzers Condition="'$(IsTestProject)' != 'true' and '$(IsSourceProject)' != 'true'">false</RunAnalyzers>
+    <CodeAnalysisRuleset Condition="'$(IsTestProject)' == 'true'">$(RepositoryEngineeringDir)CodeAnalysis.test.ruleset</CodeAnalysisRuleset>
   </PropertyGroup>
 
   <!-- Set up common paths -->

src/libraries/Microsoft.Extensions.Configuration.Binder/tests/ConfigurationBinderTests.cs

@@ -845,7 +845,7 @@ public void CanBindByteArrayWhenValueIsNull()
             var config = configurationBuilder.Build();
 
             var options = config.Get<ByteArrayOptions>();
-            Assert.Equal(null, options.MyByteArray);
+            Assert.Null(options.MyByteArray);
         }
 
         [Fact]

src/libraries/Microsoft.Extensions.DependencyInjection/tests/DI.Tests/ServiceProviderContainerTests.cs

@@ -265,7 +265,8 @@ public void ScopeDispose_PreventsServiceResolution()
             Assert.NotNull(provider.CreateScope());
         }
 
-        [Theory(Skip = "https://github.com/dotnet/runtime/issues/42160 - We don't support value task services currently")]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/42160")] // We don't support value task services currently
+        [Theory]
         [InlineData(ServiceLifetime.Transient)]
         [InlineData(ServiceLifetime.Scoped)]
         [InlineData(ServiceLifetime.Singleton)]

src/libraries/System.Security.Cryptography.Csp/tests/CspParametersTests.cs

@@ -7,6 +7,8 @@ namespace System.Security.Cryptography.Csp.Tests
 {
     public static class CspParametersTests
     {
+        public static bool ManualTestsEnabled => !string.IsNullOrEmpty(Environment.GetEnvironmentVariable("MANUAL_TESTS"));
+
         const int PROV_RSA_FULL = 1;
         const int PROV_RSA_AES = 24;
 
@@ -45,7 +47,7 @@ public static void KeyPassword_SetGet()
             }
         }
 
-        [Theory(Skip = "Manual test - requires Smart Card - read instructions")]
+        [ConditionalTheory(nameof(ManualTestsEnabled))] // requires Smart Card - read instructions
         [InlineData(true)]
         [InlineData(false)]
         public static void KeyPassword_SmartCard_Manual_Test(bool correctPassword)

src/libraries/System.Text.Json/tests/Serialization/NumberHandlingTests.cs

@@ -817,9 +817,11 @@ static void PerformFloatingPointSerialization(string testString)
         [InlineData("NaNa")]
         [InlineData("Infinitya")]
         [InlineData("-Infinitya")]
+#pragma warning disable xUnit1025 // Theory method 'FloatingPointConstants_Fail' on test class 'NumberHandlingTests' has InlineData duplicate(s)
         [InlineData("\u006EaN")] // "naN"
         [InlineData("\u0020Inf\u0069ni\u0074y")] // " Infinity"
         [InlineData("\u002BInf\u0069nity")] // "+Infinity"
+#pragma warning restore xUnit1025
         public static void FloatingPointConstants_Fail(string testString)
         {
             string testStringAsJson = $@"""{testString}""";