Use regex and less strict assertion to make test case less likely to

fail due to the race condition.

libcloud/test/dns/test_base.py

@@ -94,21 +94,21 @@ def test_export_zone_to_bind_format_success(self):
         lines1 = result.split("\n")
         lines2 = content.split("\n")
 
-        date_str = "{}-{}-{} {}:{}:{}".format(
+        date_str = r"{}-{}-{} {}:{}:{}".format(
             now.year,
             zero_pad(now.month),
             zero_pad(now.day),
             zero_pad(now.hour),
-            zero_pad(now.minute),
-            zero_pad(now.second),
+            r"\d+",
+            r"\d+",
         )
-        expected_header = "; Generated by Libcloud v{} on {} UTC".format(
+        expected_header = r"; Generated by Libcloud v{} on {} UTC".format(
             __version__,
             date_str,
         )
 
-        self.assertEqual(lines1[0], expected_header)
-        self.assertEqual(lines2[0], expected_header)
+        self.assertRegex(lines1[0], expected_header)
+        self.assertRegex(lines2[0], expected_header)
 
         for lines in [lines1, lines2]:
             self.assertEqual(len(lines), 2 + 1 + 9)