Fix some issues with tests not being independent from other tests

These are due to the tests (inadvertently) changing global state.

(DIS-2971)

tests/loaders/test_cb.py

@@ -9,12 +9,15 @@
 
 @pytest.fixture
 def mock_cbc_sdk(monkeypatch: pytest.MonkeyPatch) -> Iterator[MagicMock]:
-    try:
-        del sys.modules["dissect.target.loader"]
-    except KeyError:
-        pass
-
     with monkeypatch.context() as m:
+        # The references to cbc_sdk properties in the cb loader will point to the MagicMock created
+        # for the first test function that runs.
+        # Thus we need to delete the cb loader module to force it to be reimported when used in a
+        # new test so the MagickMock used in the cb module will be the one created for the test
+        # function that is running.
+        if "dissect.target.loaders.cb" in sys.modules:
+            m.delitem(sys.modules, "dissect.target.loaders.cb")
+
         mock_cbc_sdk = MagicMock()
         m.setitem(sys.modules, "cbc_sdk", mock_cbc_sdk)
         m.setitem(sys.modules, "cbc_sdk.errors", mock_cbc_sdk.errors)

tests/plugins/os/windows/test_registry.py

@@ -14,7 +14,7 @@ def test_missing_hives(fs_win: VirtualFilesystem, caplog: LogCaptureFixture) ->
     target = Target()
     target.filesystems.add(fs_win)
 
-    caplog.set_level(logging.DEBUG)
+    caplog.set_level(logging.DEBUG, target.log.name)
     target.apply()
 
     expected = [
@@ -31,7 +31,7 @@ def test_missing_hives(fs_win: VirtualFilesystem, caplog: LogCaptureFixture) ->
 def test_missing_user_hives(fs_win: VirtualFilesystem, target_win_users: Target, caplog: LogCaptureFixture) -> None:
     fs_win.makedirs("Users/John")
 
-    caplog.set_level(logging.DEBUG)
+    caplog.set_level(logging.DEBUG, target_win_users.log.name)
     target_win_users.registry.load_user_hives()
 
     assert [record.message for record in caplog.records if record.filename == "registry.py"] == [
@@ -47,7 +47,7 @@ def test_empty_hives(fs_win: VirtualFilesystem, caplog: LogCaptureFixture) -> No
     target = Target()
     target.filesystems.add(fs_win)
 
-    caplog.set_level(logging.WARNING)
+    caplog.set_level(logging.WARNING, target.log.name)
     target.apply()
 
     assert [record.message for record in caplog.records if record.filename == "registry.py"] == [
@@ -65,7 +65,7 @@ def test_empty_hives_skip_warning(fs_win: VirtualFilesystem, caplog: LogCaptureF
     target = Target()
     target.filesystems.add(fs_win)
 
-    caplog.set_level(logging.WARNING)
+    caplog.set_level(logging.WARNING, target.log.name)
 
     with patch("dissect.target.plugins.os.windows.registry.RegfHive"):
         target.apply()
@@ -77,7 +77,7 @@ def test_empty_user_hives(fs_win: VirtualFilesystem, target_win_users: Target, c
     fs_win.map_file_fh("Users/John/ntuser.dat", BytesIO())
     fs_win.map_file_fh("Users/John/AppData/Local/Microsoft/Windows/usrclass.dat", BytesIO())
 
-    caplog.set_level(logging.WARNING)
+    caplog.set_level(logging.WARNING, target_win_users.log.name)
     target_win_users.registry.load_user_hives()
 
     assert [record.message for record in caplog.records if record.filename == "registry.py"] == [

tests/test_plugin.py

@@ -444,7 +444,7 @@ def test_os_plugin_property_methods(target_bare: Target, method_name: str) -> No
         getattr(os_plugin, method_name)
 
 
-class TestOS1(OSPlugin):
+class MockOS1(OSPlugin):
     @export(property=True)
     def hostname(self) -> Optional[str]:
         pass
@@ -470,7 +470,7 @@ def architecture(self) -> Optional[str]:
         pass
 
 
-class TestOS2(OSPlugin):
+class MockOS2(OSPlugin):
     @export(property=True)
     def hostname(self) -> Optional[str]:
         """Test docstring hostname"""
@@ -505,8 +505,8 @@ def architecture(self) -> Optional[str]:
 @pytest.mark.parametrize(
     "subclass, replaced",
     [
-        (TestOS1, True),
-        (TestOS2, False),
+        (MockOS1, True),
+        (MockOS2, False),
     ],
 )
 def test_os_plugin___init_subclass__(subclass: type[OSPlugin], replaced: bool) -> None:

tests/test_target.py

@@ -1,5 +1,6 @@
 import io
 import urllib.parse
+from collections import defaultdict
 from pathlib import Path
 from typing import Iterator
 from unittest.mock import MagicMock, Mock, PropertyMock, call, patch
@@ -377,7 +378,7 @@ def test_target_set_event_callback() -> None:
     mock_callback2 = MagicMock()
 
     class MockTarget(Target):
-        pass
+        event_callbacks = defaultdict(set)
 
     MockTarget.set_event_callback(event_type=None, event_callback=mock_callback1)
     MockTarget.set_event_callback(event_type=None, event_callback=mock_callback2)
@@ -405,7 +406,7 @@ def test_target_send_event() -> None:
     mock_callback2 = MagicMock()
 
     class MockTarget(Target):
-        pass
+        event_callbacks = defaultdict(set)
 
     MockTarget.set_event_callback(event_type=None, event_callback=mock_callback1)
     MockTarget.set_event_callback(event_type=Event.FUNC_EXEC, event_callback=mock_callback2)