Updated skipped tests for foundation directory. (#87293)

packages/flutter/test/foundation/bit_field_test.dart

@@ -38,7 +38,7 @@ void main() {
     expect(field[_TestEnum.c], isTrue);
     expect(field[_TestEnum.d], isTrue);
     expect(field[_TestEnum.e], isTrue);
-  }, skip: kIsWeb);
+  }, skip: isBrowser); // [intended] BitField is not supported when compiled to Javascript.
 
   test('BitField.filed control test', () {
     final BitField<_TestEnum> field1 = BitField<_TestEnum>.filled(8, true);
@@ -48,5 +48,5 @@ void main() {
     final BitField<_TestEnum> field2 = BitField<_TestEnum>.filled(8, false);
 
     expect(field2[_TestEnum.d], isFalse);
-  }, skip: kIsWeb);
+  }, skip: isBrowser); // [intended] BitField is not supported when compiled to Javascript.
 }

packages/flutter/test/foundation/consolidate_response_test.dart

@@ -147,7 +147,7 @@ void main() {
         ]);
       });
     });
-  }, skip: kIsWeb);
+  });
 }
 
 class MockHttpClientResponse extends Fake implements HttpClientResponse {

packages/flutter/test/foundation/constants_test.dart

@@ -8,5 +8,5 @@ import 'package:flutter_test/flutter_test.dart';
 void main() {
   test('isWeb is false for flutter tester', () {
     expect(kIsWeb, false);
-  }, skip: kIsWeb);
+  }, skip: kIsWeb); // [intended] kIsWeb is what we are testing here.
 }

packages/flutter/test/foundation/isolates_test.dart

@@ -46,5 +46,5 @@ void main() {
     final String scriptPath = fs.path.join(packageRoot, 'test', 'foundation', '_compute_caller.dart');
     final ProcessResult result = await Process.run(dartPath, <String>[scriptPath]);
     expect(result.exitCode, 0);
-  }, skip: kIsWeb);
+  }, skip: kIsWeb); // [intended] isn't supported on the web.
 }

packages/flutter/test/foundation/serialization_test.dart

@@ -40,7 +40,7 @@ void main() {
       expect(written.lengthInBytes, equals(8));
       final ReadBuffer read = ReadBuffer(written);
       expect(read.getInt64(), equals(-9000000000000));
-    }, skip: kIsWeb);
+    }, skip: kIsWeb); // [intended] bigint isn't supported on web.
     test('of 64-bit integer in big endian', () {
       final WriteBuffer write = WriteBuffer();
       write.putInt64(-9000000000000, endian: Endian.big);
@@ -48,7 +48,7 @@ void main() {
       expect(written.lengthInBytes, equals(8));
       final ReadBuffer read = ReadBuffer(written);
       expect(read.getInt64(endian: Endian.big), equals(-9000000000000));
-    }, skip: kIsWeb);
+    }, skip: kIsWeb); // [intended] bigint isn't supported on web.
     test('of double', () {
       final WriteBuffer write = WriteBuffer();
       write.putFloat64(3.14);
@@ -86,7 +86,7 @@ void main() {
       final ReadBuffer read = ReadBuffer(written);
       read.getUint8();
       expect(read.getInt64List(3), equals(integers));
-    }, skip: kIsWeb);
+    }, skip: kIsWeb); // [intended] bigint isn't supported on web.
     test('of float list when unaligned', () {
       final Float32List floats = Float32List.fromList(<double>[3.14, double.nan]);
       final WriteBuffer write = WriteBuffer();

packages/flutter/test/foundation/stack_frame_test.dart

@@ -68,9 +68,9 @@ void main() {
       expect(frames.contains(StackFrame.stackOverFlowElision), true);
     }
     expect(overflowed, true);
-  }, skip: isBrowser); // The VM test harness can handle a stack overflow, but
-  // the browser cannot - running this test in a browser will cause it to become
-  // unresponsive.
+  }, skip: isBrowser); // [intended] The VM test harness can handle a
+  // stack overflow, but the browser cannot - running this test in a browser
+  // will cause it to become unresponsive.
 
   test('Traces from package:stack_trace throw assertion', () {
     try {

packages/flutter/test/foundation/stack_trace_test.dart

@@ -16,7 +16,7 @@ void main() {
     expect(filtered[0], matches(r'^#0 +main\.<anonymous closure> \(.*stack_trace_test\.dart:[0-9]+:[0-9]+\)$'));
     expect(filtered[1], matches(r'^#1 +Declarer\.test\.<anonymous closure>.<anonymous closure> \(package:test_api/.+:[0-9]+:[0-9]+\)$'));
     expect(filtered[2], equals('<asynchronous suspension>'));
-  }, skip: kIsWeb);
+  });
 
   test('FlutterError.defaultStackFilter (async test body)', () async {
     final List<String> filtered = FlutterError.defaultStackFilter(StackTrace.current.toString().trimRight().split('\n')).toList();