Fix regular expression for duration in tests

Author: davehunt

testing/test_pytest_html.py

@@ -52,7 +52,7 @@ def assert_results(html, tests=1, duration=None, passed=1, skipped=0, failed=0,
 
     # Asserts tests running duration
     if duration is not None:
-        tests_duration = re.search('([\d,.])+ seconds', html)
+        tests_duration = re.search('([\d,.]+) seconds', html)
         assert float(tests_duration.group(1)) >= float(duration)
 
     # Asserts by outcome