Run all tests with a pristine copy of the topic.

This has broken 26 tests which is expected because tests were written to
make the topic a single object shared between all tests, the team has to
make a decision about which way should the tests be ran, sharing the
same topic or with a pristine topic ?

refs heynemann#18

pyvows/runner.py

@@ -18,6 +18,8 @@
 from pyvows.result import VowsResult
 from pyvows.async_topic import VowsAsyncTopic, VowsAsyncTopicValue
 
+import copy
+
 
 class VowsParallelRunner(object):
     def __init__(self, vows, context_class, vow_successful_event, vow_error_event):
@@ -132,6 +134,7 @@ def run_vow(self, tests_col, topic, context_instance, member, member_name, enume
         self.pool.spawn_n(self.async_run_vow, tests_col, topic, context_instance, member, member_name, enumerated)
 
     def async_run_vow(self, tests_col, topic, context_instance, member, member_name, enumerated):
+        topic = copy.deepcopy(topic)
         start_time = time.time()
         filename, lineno = self.file_info_for(member._original)
         result_obj = {