Disable Long Running JSON tests on Checked CoreCLR

src/libraries/System.Text.Json/tests/JsonDocumentTests.cs

@@ -470,6 +470,7 @@ public static void ParseJson_UnseekableStream_BadBOM(string json)
                     new WrappedMemoryStream(canRead: true, canWrite: false, canSeek: false, data)));
         }
 
+        [SkipOnCoreClr("Long running test on Checked mode", RuntimeConfiguration.Checked)]
         [Theory]
         [MemberData(nameof(BadBOMCases))]
         public static Task ParseJson_UnseekableStream_Async_BadBOM(string json)

src/libraries/System.Text.Json/tests/Serialization/ConstructorTests/ConstructorTests.Cache.cs

@@ -124,6 +124,7 @@ public async Task PropertyCacheWithMinInputsLast()
         // this options is not the default options instance the tests will not use previously cached metadata.
         private JsonSerializerOptions s_options = new JsonSerializerOptions();
 
+        [SkipOnCoreClr("Long running test on Checked mode", RuntimeConfiguration.Checked)]
         [Fact]
         public async Task MultipleTypes()
         {

src/libraries/System.Text.Json/tests/Serialization/ConstructorTests/ConstructorTests.Stream.cs

@@ -10,6 +10,7 @@ namespace System.Text.Json.Serialization.Tests
 {
     public abstract partial class ConstructorTests
     {
+        [SkipOnCoreClr("Long running test on Checked mode", RuntimeConfiguration.Checked)]
         [Fact]
         public async Task ReadSimpleObjectAsync()
         {

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

@@ -178,6 +178,7 @@ public static async Task InvalidJsonShouldFailAtAnyPosition_Stream(
             }
         }
 
+        [SkipOnCoreClr("Long running test on Checked mode", RuntimeConfiguration.Checked)]
         [Theory]
         [MemberData(nameof(TestData), /* enumeratePayloadTweaks: */ false)]
         [ActiveIssue("https://github.com/dotnet/runtime/issues/42677", platforms: TestPlatforms.Windows, runtimes: TestRuntimes.Mono)]

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

@@ -599,6 +599,7 @@ private static void AssertDictionaryElements_StringValues(string serialized)
             }
         }
 
+        [SkipOnCoreClr("Long running test on Checked mode", RuntimeConfiguration.Checked)]
         [Fact]
         [ActiveIssue("https://github.com/dotnet/runtime/issues/39674", typeof(PlatformDetection), nameof(PlatformDetection.IsMonoInterpreter))]
         public static void DictionariesRoundTrip()

src/libraries/System.Text.Json/tests/Serialization/Stream.WriteTests.cs

@@ -48,6 +48,7 @@ public static async Task NullObjectValue()
             Assert.Equal("null", value);
         }
 
+        [SkipOnCoreClr("Long running test on Checked mode", RuntimeConfiguration.Checked)]
         [Fact]
         public static async Task RoundTripAsync()
         {

src/libraries/System.Text.Json/tests/Utf8JsonReaderTests.MultiSegment.cs

@@ -1809,6 +1809,7 @@ private static void TrailingCommasHelper(ReadOnlySequence<byte> utf8, JsonReader
             }
         }
 
+        [SkipOnCoreClr("Long running test on Checked mode", RuntimeConfiguration.Checked)]
         [Theory]
         [InlineData("{]")]
         [InlineData("[}")]

src/libraries/System.Text.Json/tests/Utf8JsonWriterTests.cs

@@ -3115,6 +3115,7 @@ public void WritingLargestPossibleBase64Bytes(bool formatted, bool skipValidatio
         }
 
         // https://github.com/dotnet/runtime/issues/30746
+        [SkipOnCoreClr("Long running test on Checked mode", RuntimeConfiguration.Checked)]
         [Theory]
         [InlineData(true, true)]
         [InlineData(true, false)]