diff --git a/airbyte-cdk/python/unit_tests/base_python/test_abstract_source.py b/airbyte-cdk/python/unit_tests/base_python/test_abstract_source.py
new file mode 100644
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+++ b/airbyte-cdk/python/unit_tests/base_python/test_abstract_source.py
@@ -0,0 +1,121 @@
+# MIT License
+#
+# Copyright (c) 2020 Airbyte
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+
+from typing import Any, Callable, Iterable, List, Mapping, Optional, Tuple, Union
+
+import pytest
+from airbyte_cdk import AirbyteCatalog, AirbyteConnectionStatus, AirbyteStream, Status, SyncMode
+from airbyte_cdk.base_python import AbstractSource, AirbyteLogger, Stream
+
+
+class MockSource(AbstractSource):
+    def __init__(self, check_lambda: Callable[[], Tuple[bool, Optional[Any]]] = None, streams: List[Stream] = None):
+        self._streams = streams
+        self.check_lambda = check_lambda
+
+    def check_connection(self, logger: AirbyteLogger, config: Mapping[str, Any]) -> Tuple[bool, Optional[Any]]:
+        return self.check_lambda()
+
+    def streams(self, config: Mapping[str, Any]) -> List[Stream]:
+        return self._streams
+
+
+@pytest.fixture
+def logger() -> AirbyteLogger:
+    return AirbyteLogger()
+
+
+def test_successful_check():
+    expected = AirbyteConnectionStatus(status=Status.SUCCEEDED)
+    assert expected == MockSource(check_lambda=lambda: (True, None)).check(logger, {})
+
+
+def test_failed_check():
+    expected = AirbyteConnectionStatus(status=Status.FAILED, message="womp womp")
+    assert expected == MockSource(check_lambda=lambda: (False, "womp womp")).check(logger, {})
+
+
+def test_raising_check():
+    expected = AirbyteConnectionStatus(status=Status.FAILED, message=f"{Exception('this should fail')}")
+    assert expected == MockSource(check_lambda=lambda: exec('raise Exception("this should fail")')).check(logger, {})
+
+
+class MockStream(Stream):
+    def read_records(
+        self,
+        sync_mode: SyncMode,
+        cursor_field: List[str] = None,
+        stream_slice: Mapping[str, Any] = None,
+        stream_state: Mapping[str, Any] = None,
+    ) -> Iterable[Mapping[str, Any]]:
+        pass
+
+    @property
+    def primary_key(self) -> Optional[Union[str, List[str], List[List[str]]]]:
+        return "pk"
+
+
+def test_discover(mocker):
+    airbyte_stream1 = AirbyteStream(
+        name="1",
+        json_schema={},
+        supported_sync_modes=[SyncMode.full_refresh, SyncMode.incremental],
+        default_cursor_field=["cursor"],
+        source_defined_cursor=True,
+        source_defined_primary_key=[["pk"]],
+    )
+    airbyte_stream2 = AirbyteStream(name="2", json_schema={}, supported_sync_modes=[SyncMode.full_refresh])
+
+    stream1 = MockStream()
+    stream2 = MockStream()
+    mocker.patch.object(stream1, "as_airbyte_stream", return_value=airbyte_stream1)
+    mocker.patch.object(stream2, "as_airbyte_stream", return_value=airbyte_stream2)
+
+    expected = AirbyteCatalog(streams=[airbyte_stream1, airbyte_stream2])
+    src = MockSource(check_lambda=lambda: (True, None), streams=[stream1, stream2])
+
+    assert expected == src.discover(logger, {})
+
+
+def test_read_nonexistent_stream_raises_exception():
+    pass
+
+
+def test_valid_fullrefresh_read_no_slices():
+    pass
+
+
+def test_valid_full_refresh_read_with_slices():
+    pass
+
+
+def test_valid_incremental_read_with_record_interval():
+    pass
+
+
+def test_valid_incremental_read_with_no_interval():
+    pass
+
+
+def test_valid_incremental_read_with_slices():
+    pass