ensure coll created

Author: prashantmital

test/test_unified_format.py

@@ -32,8 +32,7 @@
     module=__name__,
     class_name_prefix='UnifiedTestFormat',
     expected_failures=[
-        'Client side error in command starting transaction',            # PYTHON-1894
-        'InsertOne fails after multiple retryable writeConcernErrors'   # PYTHON-2452
+        'Client side error in command starting transaction',    # PYTHON-1894
     ]))
 
 

test/unified_format.py

@@ -526,9 +526,12 @@ def insert_initial_data(self, initial_data):
                 coll_name, write_concern=WriteConcern(w="majority"))
             coll.drop()
 
-            # documents MAY be an empty list
-            if len(documents):
+            if len(documents) > 0:
                 coll.insert_many(documents)
+            else:
+                # ensure collection exists
+                result = coll.insert_one({})
+                coll.delete_one({'_id': result.inserted_id})
 
     @classmethod
     def setUpClass(cls):