Add some tests.

Author: tvalentyn

sdks/python/apache_beam/utils/logger_test.py

@@ -0,0 +1,84 @@
+import unittest
+import logging
+from unittest.mock import patch
+from apache_beam.utils.logger import log_first_n, log_every_n, log_every_n_seconds, _LOG_COUNTER, _LOG_TIMER
+
+import pytest
+
+
+@pytest.mark.no_xdist
+class TestLogFirstN(unittest.TestCase):
+  def setUp(self):
+    _LOG_COUNTER.clear()
+    _LOG_TIMER.clear()
+
+  @patch('apache_beam.utils.logger.logging.getLogger')
+  def test_log_first_n_once(self, mock_get_logger):
+    mock_logger = mock_get_logger.return_value
+    for _ in range(5):
+      log_first_n(logging.INFO, "Test message", n=1)
+    mock_logger.log.assert_called_once()
+
+  @patch('apache_beam.utils.logger.logging.getLogger')
+  def test_log_first_n_multiple(self, mock_get_logger):
+    mock_logger = mock_get_logger.return_value
+    for _ in range(5):
+      log_first_n(logging.INFO, "Test message", n=3)
+    self.assertEqual(mock_logger.log.call_count, 3)
+
+  @patch('apache_beam.utils.logger.logging.getLogger')
+  def test_log_first_n_with_different_callers(self, mock_get_logger):
+    mock_logger = mock_get_logger.return_value
+    for _ in range(5):
+      log_first_n(logging.INFO, "Test message", n=2)
+
+    # call from another "caller" (another line)
+    for _ in range(5):
+      log_first_n(logging.INFO, "Test message", n=2)
+
+    self.assertEqual(mock_logger.log.call_count, 4)
+
+  @patch('apache_beam.utils.logger.logging.getLogger')
+  def test_log_first_n_with_message_key(self, mock_get_logger):
+    mock_logger = mock_get_logger.return_value
+    log_first_n(logging.INFO, "Test message", n=1, key="message")
+    log_first_n(logging.INFO, "Test message", n=1, key="message")
+    self.assertEqual(mock_logger.log.call_count, 1)
+
+  @patch('apache_beam.utils.logger.logging.getLogger')
+  def test_log_first_n_with_caller_and_message_key(self, mock_get_logger):
+    mock_logger = mock_get_logger.return_value
+    for message in ["Test message", "Another message"]:
+      for _ in range(5):
+        log_first_n(logging.INFO, message, n=1, key=("caller", "message"))
+    self.assertEqual(mock_logger.log.call_count, 2)
+
+  @patch('apache_beam.utils.logger.logging.getLogger')
+  def test_log_every_n_multiple(self, mock_get_logger):
+    mock_logger = mock_get_logger.return_value
+    for _ in range(9):
+      log_every_n(logging.INFO, "Test message", n=2)
+
+    self.assertEqual(mock_logger.log.call_count, 5)
+
+  @patch('apache_beam.utils.logger.logging.getLogger')
+  @patch('apache_beam.utils.logger.time.time')
+  def test_log_every_n_seconds_always(self, mock_time, mock_get_logger):
+    mock_logger = mock_get_logger.return_value
+    for i in range(3):
+      mock_time.return_value = i
+      log_every_n_seconds(logging.INFO, "Test message", n=0)
+    self.assertEqual(mock_logger.log.call_count, 3)
+
+  @patch('apache_beam.utils.logger.logging.getLogger')
+  @patch('apache_beam.utils.logger.time.time')
+  def test_log_every_n_seconds_multiple(self, mock_time, mock_get_logger):
+    mock_logger = mock_get_logger.return_value
+    for i in range(4):
+      mock_time.return_value = i
+      log_every_n_seconds(logging.INFO, "Test message", n=2)
+    self.assertEqual(mock_logger.log.call_count, 2)
+
+
+if __name__ == '__main__':
+  unittest.main()