Add test case for MP Consumer auto commit

Tweak MP Consumer test to use iterator

test/test_consumer_integration.py

@@ -327,6 +327,41 @@ class TestConsumerIntegration(KafkaIntegrationTestCase):
         consumer1.stop()
         consumer2.stop()
 
+    @kafka_versions("0.8.1", "0.8.1.1", "0.8.2.0")
+    def test_multi_process_offset_behavior__resuming_behavior(self):
+        self.send_messages(0, range(0, 100))
+        self.send_messages(1, range(100, 200))
+
+        # Start a consumer
+        consumer1 = self.consumer(
+            consumer=MultiProcessConsumer,
+            auto_commit_every_t = None,
+            auto_commit_every_n = 20,
+            )
+
+        # Grab the first 195 messages
+        output_msgs1 = []
+        idx = 0
+        for message in consumer1:
+            output_msgs1.append(message.message.value)
+            idx += 1
+            if idx >= 195:
+                break
+        self.assert_message_count(output_msgs1, 195)
+
+        # The total offset across both partitions should be at 180
+        consumer2 = self.consumer(
+            consumer=MultiProcessConsumer,
+            auto_commit_every_t = None,
+            auto_commit_every_n = 20,
+            )
+
+        # 181-200
+        self.assert_message_count([ message for message in consumer2 ], 20)
+
+        consumer1.stop()
+        consumer2.stop()
+
     # TODO: Make this a unit test -- should not require integration
     @kafka_versions("all")
     def test_fetch_buffer_size(self):