1 files changed, 91 insertions, 0 deletions
diff --git a/tests/test_base.py b/tests/test_base.py
new file mode 100644
index 000000000..a16e2af8f
--- /dev/null
+++ b/tests/test_base.py
@@ -0,0 +1,91 @@
+import logging
+import unittest
+import unittest.mock
+
+
+from tests.base import LoggingTestCase, _CaptureLogHandler
+
+
+class LoggingTestCaseTests(unittest.TestCase):
+    """Tests for the LoggingTestCase."""
+
+    @classmethod
+    def setUpClass(cls):
+        cls.log = logging.getLogger(__name__)
+
+    def test_assert_not_logs_does_not_raise_with_no_logs(self):
+        """Test if LoggingTestCase.assertNotLogs does not raise when no logs were emitted."""
+        try:
+            with LoggingTestCase.assertNotLogs(self, level=logging.DEBUG):
+                pass
+        except AssertionError:
+            self.fail("`self.assertNotLogs` raised an AssertionError when it should not!")
+
+    @unittest.mock.patch("tests.base.LoggingTestCase.assertNotLogs")
+    def test_the_test_function_assert_not_logs_does_not_raise_with_no_logs(self, assertNotLogs):
+        """Test if test_assert_not_logs_does_not_raise_with_no_logs captures exception correctly."""
+        assertNotLogs.return_value = iter([None])
+        assertNotLogs.side_effect = AssertionError
+
+        message = "`self.assertNotLogs` raised an AssertionError when it should not!"
+        with self.assertRaises(AssertionError, msg=message):
+            self.test_assert_not_logs_does_not_raise_with_no_logs()
+
+    def test_assert_not_logs_raises_correct_assertion_error_when_logs_are_emitted(self):
+        """Test if LoggingTestCase.assertNotLogs raises AssertionError when logs were emitted."""
+        msg_regex = (
+            r"1 logs of DEBUG or higher were triggered on root:\n"
+            r'<LogRecord: tests\.test_base, [\d]+, .+/tests/test_base\.py, [\d]+, "Log!">'
+        )
+        with self.assertRaisesRegex(AssertionError, msg_regex):
+            with LoggingTestCase.assertNotLogs(self, level=logging.DEBUG):
+                self.log.debug("Log!")
+
+    def test_assert_not_logs_reraises_unexpected_exception_in_managed_context(self):
+        """Test if LoggingTestCase.assertNotLogs reraises an unexpected exception."""
+        with self.assertRaises(ValueError, msg="test exception"):
+            with LoggingTestCase.assertNotLogs(self, level=logging.DEBUG):
+                raise ValueError("test exception")
+
+    def test_assert_not_logs_restores_old_logging_settings(self):
+        """Test if LoggingTestCase.assertNotLogs reraises an unexpected exception."""
+        old_handlers = self.log.handlers[:]
+        old_level = self.log.level
+        old_propagate = self.log.propagate
+
+        with LoggingTestCase.assertNotLogs(self, level=logging.DEBUG):
+            pass
+
+        self.assertEqual(self.log.handlers, old_handlers)
+        self.assertEqual(self.log.level, old_level)
+        self.assertEqual(self.log.propagate, old_propagate)
+
+    def test_logging_test_case_works_with_logger_instance(self):
+        """Test if the LoggingTestCase captures logging for provided logger."""
+        log = logging.getLogger("new_logger")
+        with self.assertRaises(AssertionError):
+            with LoggingTestCase.assertNotLogs(self, logger=log):
+                log.info("Hello, this should raise an AssertionError")
+
+    def test_logging_test_case_respects_alternative_logger(self):
+        """Test if LoggingTestCase only checks the provided logger."""
+        log_one = logging.getLogger("log one")
+        log_two = logging.getLogger("log two")
+        with LoggingTestCase.assertNotLogs(self, logger=log_one):
+            log_two.info("Hello, this should not raise an AssertionError")
+
+    def test_logging_test_case_respects_logging_level(self):
+        """Test if LoggingTestCase does not raise for a logging level lower than provided."""
+        with LoggingTestCase.assertNotLogs(self, level=logging.CRITICAL):
+            self.log.info("Hello, this should raise an AssertionError")
+
+    def test_capture_log_handler_default_initialization(self):
+        """Test if the _CaptureLogHandler is initialized properly."""
+        handler = _CaptureLogHandler()
+        self.assertFalse(handler.records)
+
+    def test_capture_log_handler_saves_record_on_emit(self):
+        """Test if the _CaptureLogHandler saves the log record when it's emitted."""
+        handler = _CaptureLogHandler()
+        handler.emit("Log message")
+        self.assertIn("Log message", handler.records)