Add maxlag regexp tests

Bug: T144023
Change-Id: Iacd0cadca90b3b7debafcb2d3e4f95352b356bb1

tests/api_tests.py

@@ -1065,6 +1065,18 @@ def test_valid_lagpattern(self):
         self.assertIsInstance(value, int)
         self.assertGreaterEqual(value, 0)
 
+    def test_individual_patterns(self):
+        """Test api.lagpattern with example patterns."""
+        patterns = {
+            'Waiting for 10.64.32.115: 0.14024019241333 seconds lagged': 0,
+            'Waiting for hostname: 5 seconds lagged': 5,
+            'Waiting for 127.0.0.1: 1.7 seconds lagged': 1
+        }
+        for info, time in patterns.items():
+            lag = api.lagpattern.search(info)
+            self.assertIsNotNone(lag)
+            self.assertEqual(int(lag.group("lag")), time)
+
 
 if __name__ == '__main__':  # pragma: no cover
     try: