diff --git a/airbyte_cdk/connector_builder/connector_builder_handler.py b/airbyte_cdk/connector_builder/connector_builder_handler.py
index 27929dfa2..6b6b31111 100644
--- a/airbyte_cdk/connector_builder/connector_builder_handler.py
+++ b/airbyte_cdk/connector_builder/connector_builder_handler.py
@@ -4,7 +4,7 @@
 
 
 from dataclasses import asdict, dataclass, field
-from typing import Any, Dict, List, Mapping
+from typing import Any, ClassVar, Dict, List, Mapping
 
 from airbyte_cdk.connector_builder.test_reader import TestReader
 from airbyte_cdk.models import (
@@ -37,6 +37,8 @@
 
 @dataclass
 class TestLimits:
+    __test__: ClassVar[bool] = False  # Tell Pytest this is not a Pytest class, despite its name
+
     max_records: int = field(default=DEFAULT_MAXIMUM_RECORDS)
     max_pages_per_slice: int = field(default=DEFAULT_MAXIMUM_NUMBER_OF_PAGES_PER_SLICE)
     max_slices: int = field(default=DEFAULT_MAXIMUM_NUMBER_OF_SLICES)
diff --git a/airbyte_cdk/connector_builder/test_reader/reader.py b/airbyte_cdk/connector_builder/test_reader/reader.py
index b776811eb..a125047b4 100644
--- a/airbyte_cdk/connector_builder/test_reader/reader.py
+++ b/airbyte_cdk/connector_builder/test_reader/reader.py
@@ -4,7 +4,7 @@
 
 
 import logging
-from typing import Any, Dict, Iterator, List, Mapping, Optional, Union
+from typing import Any, ClassVar, Dict, Iterator, List, Mapping, Optional, Union
 
 from airbyte_cdk.connector_builder.models import (
     AuxiliaryRequest,
@@ -66,6 +66,8 @@ class TestReader:
 
     """
 
+    __test__: ClassVar[bool] = False  # Tell Pytest this is not a Pytest class, despite its name
+
     logger = logging.getLogger("airbyte.connector-builder")
 
     def __init__(
diff --git a/pytest.ini b/pytest.ini
index 6a5cafc1f..d6b4b4683 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -5,3 +5,7 @@ log_cli_format = %(asctime)s [%(levelname)8s] %(message)s (%(filename)s:%(lineno
 log_cli_date_format=%Y-%m-%d %H:%M:%S
 filterwarnings =
     ignore::airbyte_cdk.sources.source.ExperimentalClassWarning
+markers =
+    slow: mark tests as slow
+    asyncio: mark test as asyncio
+    requires_creds: mark test as requiring credentials
diff --git a/unit_tests/sources/declarative/decoders/test_composite_decoder.py b/unit_tests/sources/declarative/decoders/test_composite_decoder.py
index 02c0993b6..cd0a562ae 100644
--- a/unit_tests/sources/declarative/decoders/test_composite_decoder.py
+++ b/unit_tests/sources/declarative/decoders/test_composite_decoder.py
@@ -8,7 +8,7 @@
 from http.server import BaseHTTPRequestHandler, HTTPServer
 from io import BytesIO, StringIO
 from threading import Thread
-from typing import Iterable
+from typing import ClassVar, Iterable
 from unittest.mock import Mock, patch
 
 import pytest
@@ -259,6 +259,8 @@ def test_composite_raw_decoder_csv_parser_values(requests_mock, encoding: str, d
 
 
 class TestServer(BaseHTTPRequestHandler):
+    __test__: ClassVar[bool] = False  # Tell Pytest this is not a Pytest class, despite its name
+
     def do_GET(self) -> None:
         self.send_response(200)
         self.end_headers()
diff --git a/unit_tests/sources/declarative/parsers/testing_components.py b/unit_tests/sources/declarative/parsers/testing_components.py
index 0d49e8627..ab9ae5346 100644
--- a/unit_tests/sources/declarative/parsers/testing_components.py
+++ b/unit_tests/sources/declarative/parsers/testing_components.py
@@ -3,7 +3,7 @@
 #
 
 from dataclasses import dataclass, field
-from typing import List, Optional
+from typing import ClassVar, List, Optional
 
 from airbyte_cdk.sources.declarative.extractors import DpathExtractor
 from airbyte_cdk.sources.declarative.partition_routers import SubstreamPartitionRouter
@@ -21,6 +21,8 @@ class TestingSomeComponent(DefaultErrorHandler):
     A basic test class with various field permutations used to test manifests with custom components
     """
 
+    __test__: ClassVar[bool] = False  # Tell Pytest this is not a Pytest class, despite its name
+
     subcomponent_field_with_hint: DpathExtractor = field(
         default_factory=lambda: DpathExtractor(field_path=[], config={}, parameters={})
     )
@@ -37,5 +39,7 @@ class TestingCustomSubstreamPartitionRouter(SubstreamPartitionRouter):
     A test class based on a SubstreamPartitionRouter used for testing manifests that use custom components.
     """
 
+    __test__: ClassVar[bool] = False  # Tell Pytest this is not a Pytest class, despite its name
+
     custom_field: str
     custom_pagination_strategy: PaginationStrategy
diff --git a/unit_tests/sources/declarative/test_yaml_declarative_source.py b/unit_tests/sources/declarative/test_yaml_declarative_source.py
index 67f198eb2..846547eec 100644
--- a/unit_tests/sources/declarative/test_yaml_declarative_source.py
+++ b/unit_tests/sources/declarative/test_yaml_declarative_source.py
@@ -5,6 +5,7 @@
 import logging
 import os
 import tempfile
+from typing import ClassVar
 
 import pytest
 from yaml.parser import ParserError
@@ -133,6 +134,8 @@ def test_source_with_missing_reference_fails(self):
 
 
 class TestFileContent:
+    __test__: ClassVar[bool] = False  # Tell Pytest this is not a Pytest class, despite its name
+
     def __init__(self, content):
         self.file = tempfile.NamedTemporaryFile(mode="w", delete=False)
 
diff --git a/unit_tests/sources/file_based/scenarios/scenario_builder.py b/unit_tests/sources/file_based/scenarios/scenario_builder.py
index da8c7ba87..93e8f952a 100644
--- a/unit_tests/sources/file_based/scenarios/scenario_builder.py
+++ b/unit_tests/sources/file_based/scenarios/scenario_builder.py
@@ -4,7 +4,7 @@
 from abc import ABC, abstractmethod
 from copy import deepcopy
 from dataclasses import dataclass, field
-from typing import Any, Generic, List, Mapping, Optional, Set, Tuple, Type, TypeVar
+from typing import Any, ClassVar, Generic, List, Mapping, Optional, Set, Tuple, Type, TypeVar
 
 from airbyte_cdk.models import (
     AirbyteAnalyticsTraceMessage,
@@ -42,6 +42,8 @@ def build(
 
 
 class TestScenario(Generic[SourceType]):
+    __test__: ClassVar[bool] = False  # Tell Pytest this is not a Pytest class, despite its name
+
     def __init__(
         self,
         name: str,
@@ -238,21 +240,21 @@ def build(self) -> "TestScenario[SourceType]":
             state,
         )
         return TestScenario(
-            self._name,
-            self._config,
-            source,
-            self._expected_spec,
-            self._expected_check_status,
-            self._expected_catalog,
-            self._expected_logs,
-            self._expected_records,
-            self._expected_check_error,
-            self._expected_discover_error,
-            self._expected_read_error,
-            self._incremental_scenario_config,
-            self._expected_analytics,
-            self._log_levels,
-            self._catalog,
+            name=self._name,
+            config=self._config,
+            source=source,
+            expected_spec=self._expected_spec,
+            expected_check_status=self._expected_check_status,
+            expected_catalog=self._expected_catalog,
+            expected_logs=self._expected_logs,
+            expected_records=self._expected_records,
+            expected_check_error=self._expected_check_error,
+            expected_discover_error=self._expected_discover_error,
+            expected_read_error=self._expected_read_error,
+            incremental_scenario_config=self._incremental_scenario_config,
+            expected_analytics=self._expected_analytics,
+            log_levels=self._log_levels,
+            catalog=self._catalog,
         )
 
     def _configured_catalog(self, sync_mode: SyncMode) -> Optional[Mapping[str, Any]]:
diff --git a/unit_tests/sources/file_based/test_file_based_stream_reader.py b/unit_tests/sources/file_based/test_file_based_stream_reader.py
index 4a9d4e349..ace2999e0 100644
--- a/unit_tests/sources/file_based/test_file_based_stream_reader.py
+++ b/unit_tests/sources/file_based/test_file_based_stream_reader.py
@@ -5,7 +5,7 @@
 import logging
 from datetime import datetime
 from io import IOBase
-from typing import Any, Dict, Iterable, List, Mapping, Optional, Set
+from typing import Any, ClassVar, Dict, Iterable, List, Mapping, Optional, Set
 
 import pytest
 from pydantic.v1 import AnyUrl
@@ -62,6 +62,8 @@
 
 
 class TestStreamReader(AbstractFileBasedStreamReader):
+    __test__: ClassVar[bool] = False  # Tell Pytest this is not a Pytest class, despite its name
+
     @property
     def config(self) -> Optional[AbstractFileBasedSpec]:
         return self._config
@@ -100,6 +102,10 @@ def identities_schema(self) -> Dict[str, Any]:
 
 
 class TestSpec(AbstractFileBasedSpec):
+    __test__: ClassVar[bool] = (
+        False  # Prevent pytest from thinking that this is a test class, despite the name
+    )
+
     @classmethod
     def documentation_url(cls) -> AnyUrl:
         return AnyUrl(scheme="https", url="https://docs.airbyte.com/integrations/sources/test")  # type: ignore