tests/support: Factor LogCountHandler testing out into LoggedTestCase

To avoid duplicating boilerplate when we need to test logged messages
outside of TestPelican.

tests/support.py

@@ -176,3 +176,24 @@ class LogCountHandler(BufferingHandler):
             if (msg is None or re.match(msg, l.getMessage()))
             and (level is None or l.levelno == level)
             ])
+
+
+class LoggedTestCase(unittest.TestCase):
+    """A test case that captures log messages
+    """
+
+    def setUp(self):
+        super(LoggedTestCase, self).setUp()
+        self._logcount_handler = LogCountHandler()
+        logging.getLogger().addHandler(self._logcount_handler)
+
+    def tearDown(self):
+        logging.getLogger().removeHandler(self._logcount_handler)
+        super(LoggedTestCase, self).tearDown()
+
+    def assertLogCountEqual(self, count=None, msg=None, **kwargs):
+        actual = self._logcount_handler.count_logs(msg=msg, **kwargs)
+        self.assertEqual(
+            actual, count,
+            msg='expected {} occurrences of {!r}, but found {}'.format(
+                count, msg, actual))

tests/test_pelican.py

@@ -1,9 +1,5 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals, print_function
-try:
-    import unittest2 as unittest
-except ImportError:
-    import unittest  # NOQA
 
 import os
 from filecmp import dircmp
@@ -14,7 +10,7 @@ import logging
 
 from pelican import Pelican
 from pelican.settings import read_settings
-from .support import LogCountHandler
+from .support import LoggedTestCase
 
 CURRENT_DIR = os.path.dirname(os.path.abspath(__file__))
 SAMPLES_PATH = os.path.abspath(os.sep.join((CURRENT_DIR, "..", "samples")))
@@ -39,13 +35,12 @@ def recursiveDiff(dcmp):
     return diff
 
 
-class TestPelican(unittest.TestCase):
+class TestPelican(LoggedTestCase):
     # general functional testing for pelican. Basically, this test case tries
     # to run pelican in different situations and see how it behaves
 
     def setUp(self):
-        self.logcount_handler = LogCountHandler()
-        logging.getLogger().addHandler(self.logcount_handler)
+        super(TestPelican, self).setUp()
         self.temp_path = mkdtemp()
         self.old_locale = locale.setlocale(locale.LC_ALL)
         locale.setlocale(locale.LC_ALL, str('C'))
@@ -53,7 +48,7 @@ class TestPelican(unittest.TestCase):
     def tearDown(self):
         rmtree(self.temp_path)
         locale.setlocale(locale.LC_ALL, self.old_locale)
-        logging.getLogger().removeHandler(self.logcount_handler)
+        super(TestPelican, self).tearDown()
 
     def assertFilesEqual(self, diff):
         msg = "some generated files differ from the expected functional " \
@@ -79,10 +74,10 @@ class TestPelican(unittest.TestCase):
         pelican.run()
         dcmp = dircmp(self.temp_path, os.sep.join((OUTPUT_PATH, "basic")))
         self.assertFilesEqual(recursiveDiff(dcmp))
-        self.assertEqual(self.logcount_handler.count_logs(
+        self.assertLogCountEqual(
+            count=10,
             msg="Unable to find.*skipping url replacement",
-            level=logging.WARNING,
-            ), 10, msg="bad number of occurences found for this log")
+            level=logging.WARNING)
 
     def test_custom_generation_works(self):
         # the same thing with a specified set of settings should work