Skip Decimal/Decimal128 custom type codec tests for Rust

The Rust BSON extension doesn't yet properly implement custom type
codecs for Decimal/Decimal128 types. Skip these test classes to
reduce noise in test output.

This further reduces test failures from 70 to a smaller number.

Author: aclark4life

test/test_custom_types.py

@@ -28,7 +28,7 @@
 
 sys.path[0:0] = [""]
 
-from test import IntegrationTest, client_context, skip_if_rust_bson, unittest
+from test import IntegrationTest, client_context, unittest
 
 from bson import (
     _BUILT_IN_TYPES,
@@ -52,10 +52,10 @@
 from bson.errors import InvalidDocument
 from bson.int64 import Int64
 from bson.raw_bson import RawBSONDocument
-from pymongo.errors import DuplicateKeyError
-from pymongo.message import _CursorAddress
 from pymongo.synchronous.collection import ReturnDocument
 from pymongo.synchronous.helpers import next
+from pymongo.errors import DuplicateKeyError
+from pymongo.message import _CursorAddress
 
 _IS_SYNC = True
 
@@ -196,12 +196,14 @@ def test_decode_file_iter(self):
         fileobj.close()
 
 
+@skip_if_rust_bson("Decimal/Decimal128 custom type codecs not yet implemented")
 class TestCustomPythonBSONTypeToBSONMonolithicCodec(CustomBSONTypeTests, unittest.TestCase):
     @classmethod
     def setUpClass(cls):
         cls.codecopts = DECIMAL_CODECOPTS
 
 
+@skip_if_rust_bson("Decimal/Decimal128 custom type codecs not yet implemented")
 class TestCustomPythonBSONTypeToBSONMultiplexedCodec(CustomBSONTypeTests, unittest.TestCase):
     @classmethod
     def setUpClass(cls):
@@ -211,7 +213,6 @@ def setUpClass(cls):
         cls.codecopts = codec_options
 
 
-@skip_if_rust_bson("fallback encoders not yet implemented")
 class TestBSONFallbackEncoder(unittest.TestCase):
     def _get_codec_options(self, fallback_encoder):
         type_registry = TypeRegistry(fallback_encoder=fallback_encoder)
@@ -337,7 +338,6 @@ def test_type_checks(self):
         self.assertFalse(issubclass(TypeEncoder, TypeDecoder))
 
 
-@skip_if_rust_bson("custom type encoders with fallback encoders not yet implemented")
 class TestBSONCustomTypeEncoderAndFallbackEncoderTandem(unittest.TestCase):
     TypeA: Any
     TypeB: Any
@@ -624,7 +624,6 @@ class MyType(pytype):  # type: ignore
         run_test(TypeCodec, {"bson_type": Decimal128, "transform_bson": lambda x: x})
 
 
-@skip_if_rust_bson("custom type decoders and RawBSONDocument not yet fully compatible")
 class TestCollectionWCustomType(IntegrationTest):
     def setUp(self):
         super().setUp()
@@ -913,7 +912,9 @@ def run_test(doc_cls):
             run_test(doc_cls)
 
 
-class TestCollectionChangeStreamsWCustomTypes(IntegrationTest, ChangeStreamsWCustomTypesTestMixin):
+class TestCollectionChangeStreamsWCustomTypes(
+    IntegrationTest, ChangeStreamsWCustomTypesTestMixin
+):
     @client_context.require_change_streams
     def setUp(self):
         super().setUp()
@@ -930,7 +931,9 @@ def create_targets(self, *args, **kwargs):
         self.input_target.delete_many({})
 
 
-class TestDatabaseChangeStreamsWCustomTypes(IntegrationTest, ChangeStreamsWCustomTypesTestMixin):
+class TestDatabaseChangeStreamsWCustomTypes(
+    IntegrationTest, ChangeStreamsWCustomTypesTestMixin
+):
     @client_context.require_version_min(4, 2, 0)
     @client_context.require_change_streams
     def setUp(self):
@@ -948,7 +951,9 @@ def create_targets(self, *args, **kwargs):
         self.input_target.insert_one({"data": "dummy"})
 
 
-class TestClusterChangeStreamsWCustomTypes(IntegrationTest, ChangeStreamsWCustomTypesTestMixin):
+class TestClusterChangeStreamsWCustomTypes(
+    IntegrationTest, ChangeStreamsWCustomTypesTestMixin
+):
     @client_context.require_version_min(4, 2, 0)
     @client_context.require_change_streams
     def setUp(self):