1 files changed, 58 insertions, 0 deletions
diff --git a/tests/unittests/test_log.py b/tests/unittests/test_log.py
new file mode 100644
index 00000000..68fb4b8d
--- /dev/null
+++ b/tests/unittests/test_log.py
@@ -0,0 +1,58 @@
+# This file is part of cloud-init. See LICENSE file for license information.
+
+"""Tests for cloudinit.log """
+
+from .helpers import CiTestCase
+from cloudinit.analyze.dump import CLOUD_INIT_ASCTIME_FMT
+from cloudinit import log as ci_logging
+import datetime
+import logging
+import six
+import time
+
+
+class TestCloudInitLogger(CiTestCase):
+
+    def setUp(self):
+        # set up a logger like cloud-init does in setupLogging, but instead
+        # of sys.stderr, we'll plug in a StringIO() object so we can see
+        # what gets logged
+        logging.Formatter.converter = time.gmtime
+        self.ci_logs = six.StringIO()
+        self.ci_root = logging.getLogger()
+        console = logging.StreamHandler(self.ci_logs)
+        console.setFormatter(logging.Formatter(ci_logging.DEF_CON_FORMAT))
+        console.setLevel(ci_logging.DEBUG)
+        self.ci_root.addHandler(console)
+        self.ci_root.setLevel(ci_logging.DEBUG)
+        self.LOG = logging.getLogger('test_cloudinit_logger')
+
+    def test_logger_uses_gmtime(self):
+        """Test that log message have timestamp in UTC (gmtime)"""
+
+        # Log a message, extract the timestamp from the log entry
+        # convert to datetime, and compare to a utc timestamp before
+        # and after the logged message.
+
+        # Due to loss of precision in the LOG timestamp, subtract and add
+        # time to the utc stamps for comparison
+        #
+        # utc_before: 2017-08-23 14:19:42.569299
+        # parsed dt : 2017-08-23 14:19:43.069000
+        # utc_after : 2017-08-23 14:19:43.570064
+
+        utc_before = datetime.datetime.utcnow() - datetime.timedelta(0, 0.5)
+        self.LOG.error('Test message')
+        utc_after = datetime.datetime.utcnow() + datetime.timedelta(0, 0.5)
+
+        # extract timestamp from log:
+        # 2017-08-23 14:19:43,069 - test_log.py[ERROR]: Test message
+        logstr = self.ci_logs.getvalue().splitlines()[0]
+        timestampstr = logstr.split(' - ')[0]
+        parsed_dt = datetime.datetime.strptime(timestampstr,
+                                               CLOUD_INIT_ASCTIME_FMT)
+
+        self.assertLess(utc_before, parsed_dt)
+        self.assertLess(parsed_dt, utc_after)
+        self.assertLess(utc_before, utc_after)
+        self.assertGreater(utc_after, parsed_dt)