Include option stream subscription change in test

tests/test_questrade.py

@@ -51,6 +51,7 @@ _ex_quotes = {
         'askSize': 0,
         'bidPrice': None,
         'bidSize': 0,
+        'contract_type': 'call',
         'delay': 0,
         'delta': -0.212857,
         "expiry": "2021-01-15T00:00:00.000000-05:00",
@@ -200,6 +201,7 @@ async def stream_option_chain(portal, symbols):
         broker='questrade',
         symbols=[sub],
         feed_type='option',
+        rate=4,
         diff_cached=False,
     )
     try:
@@ -223,15 +225,34 @@ async def stream_option_chain(portal, symbols):
                 count += 1
                 if count == loops:
                     break
+
+        # switch the subscription and make sure
+        # stream is still working
+        sub = subs_keys[1]
+        await agen.aclose()
+        agen = await portal.run(
+            'piker.brokers.data',
+            'start_quote_stream',
+            broker='questrade',
+            symbols=[sub],
+            feed_type='option',
+            rate=4,
+            diff_cached=False,
+        )
+
+        await agen.__anext__()
+        with trio.fail_after(2.1):
+            loops = 8
+            count = 0
+            async for quotes in agen:
+                for symbol, quote in quotes.items():
+                    assert quote['key'] == sub
+                count += 1
+                if count == loops:
+                    break
     finally:
         # unsub
-        await portal.run(
+        await agen.aclose()
-            'piker.brokers.data',
-            'modify_quote_stream',
-            broker='questrade',
-            feed_type='option',
-            symbols=[],
-        )
 
 
 async def stream_stocks(portal, symbols):
@@ -252,13 +273,7 @@ async def stream_stocks(portal, symbols):
             break
     finally:
         # unsub
-        await portal.run(
+        await agen.aclose()
-            'piker.brokers.data',
-            'modify_quote_stream',
-            broker='questrade',
-            feed_type='stock',
-            symbols=[],
-        )
 
 
 @pytest.mark.parametrize(