diff --git a/piker/testing/__init__.py b/piker/testing/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/piker/testing/_quote_streamer.py b/piker/testing/_quote_streamer.py
new file mode 100644
index 00000000..109f15de
--- /dev/null
+++ b/piker/testing/_quote_streamer.py
@@ -0,0 +1,31 @@
+"""
+Mock a broker module.
+"""
+from itertools import cycle
+import json
+from os import path
+import trio
+from async_generator import asynccontextmanager
+
+
+@asynccontextmanager
+async def get_client() -> None:
+    """Shim client factory.
+    """
+    yield None
+
+
+async def poll_tickers(
+    client, tickers: [str], q: trio.Queue) -> None:
+    """Stream quotes from a local json store.
+    """
+    with open(path.join(path.dirname(__file__), 'quotes.json'), 'r') as quotes_file:
+        content = quotes_file.read()
+
+    pkts = content.split('--')  # simulate 2 separate quote packets
+    # import pdb; pdb.set_trace()
+    payloads = [json.loads(pkt)['quotes'] for pkt in pkts]
+
+    for payload in cycle(payloads):
+        q.put_nowait(payload)
+        await trio.sleep(1/2.)
diff --git a/piker/testing/quotes.json b/piker/testing/quotes.json
new file mode 100644
index 00000000..4b01ab74
--- /dev/null
+++ b/piker/testing/quotes.json
@@ -0,0 +1,240 @@
+{
+    "quotes": [
+        {
+            "VWAP": 7.383792,
+            "askPrice": 7.56,
+            "askSize": 2,
+            "bidPrice": 6.1,
+            "bidSize": 2,
+            "delay": 0,
+            "high52w": 9.68,
+            "highPrice": 8,
+            "isHalted": false,
+            "lastTradePrice": 6.96,
+            "lastTradePriceTrHrs": 6.97,
+            "lastTradeSize": 2000,
+            "lastTradeTick": "Down",
+            "lastTradeTime": "2018-02-07T15:59:59.259000-05:00",
+            "low52w": 1.03,
+            "lowPrice": 6.88,
+            "openPrice": 7.64,
+            "symbol": "EMH.VN",
+            "symbolId": 10164524,
+            "tier": "",
+            "volume": 5357805
+        },
+        {
+            "VWAP": 29.445855,
+            "askPrice": 55,
+            "askSize": 2,
+            "bidPrice": 27.63,
+            "bidSize": 20,
+            "delay": 0,
+            "high52w": 44,
+            "highPrice": 31.35,
+            "isHalted": false,
+            "lastTradePrice": 27.67,
+            "lastTradePriceTrHrs": 27.62,
+            "lastTradeSize": 100,
+            "lastTradeTick": "Down",
+            "lastTradeTime": "2018-02-07T16:16:17.723000-05:00",
+            "low52w": 6.58,
+            "lowPrice": 26.66,
+            "openPrice": 30.43,
+            "symbol": "WEED.TO",
+            "symbolId": 16529510,
+            "tier": "",
+            "volume": 14762722
+        },
+        {
+            "VWAP": 18.353787,
+            "askPrice": 19,
+            "askSize": 4,
+            "bidPrice": 10,
+            "bidSize": 1,
+            "delay": 0,
+            "high52w": 31.25,
+            "highPrice": 18.99,
+            "isHalted": false,
+            "lastTradePrice": 17.9,
+            "lastTradePriceTrHrs": 17.87,
+            "lastTradeSize": 1600,
+            "lastTradeTick": "Up",
+            "lastTradeTime": "2018-02-07T16:00:00.201000-05:00",
+            "low52w": 6.81,
+            "lowPrice": 17.33,
+            "openPrice": 18.71,
+            "symbol": "LEAF.TO",
+            "symbolId": 17821824,
+            "tier": "",
+            "volume": 1322510
+        },
+        {
+            "VWAP": 19.492624,
+            "askPrice": 25.18,
+            "askSize": 1,
+            "bidPrice": 10.31,
+            "bidSize": 5,
+            "delay": 0,
+            "high52w": 25.56,
+            "highPrice": 20.7,
+            "isHalted": false,
+            "lastTradePrice": 18.74,
+            "lastTradePriceTrHrs": 18.74,
+            "lastTradeSize": 100,
+            "lastTradeTick": "Up",
+            "lastTradeTime": "2018-02-07T15:59:49.451000-05:00",
+            "low52w": 8.36,
+            "lowPrice": 18.18,
+            "openPrice": 19.97,
+            "symbol": "HMMJ.TO",
+            "symbolId": 18022628,
+            "tier": "",
+            "volume": 2427378
+        },
+        {
+            "VWAP": 7.620155,
+            "askPrice": 5.9,
+            "askSize": 30,
+            "bidPrice": 5.66,
+            "bidSize": 30,
+            "delay": 0,
+            "high52w": 9.8,
+            "highPrice": 8.05,
+            "isHalted": false,
+            "lastTradePrice": 7.53,
+            "lastTradePriceTrHrs": 7.53,
+            "lastTradeSize": 900,
+            "lastTradeTick": "Equal",
+            "lastTradeTime": "2018-02-07T15:59:55.899000-05:00",
+            "low52w": 1.52,
+            "lowPrice": 7.06,
+            "openPrice": 7.69,
+            "symbol": "VFF.TO",
+            "symbolId": 40747,
+            "tier": "",
+            "volume": 828156
+        }
+    ]
+}
+
+--
+{
+    "quotes": [
+        {
+            "VWAP": 7.383792,
+            "askPrice": 7.55,
+            "askSize": 2,
+            "bidPrice": 6.2,
+            "bidSize": 2,
+            "delay": 0,
+            "high52w": 9.68,
+            "highPrice": 8,
+            "isHalted": false,
+            "lastTradePrice": 6.97,
+            "lastTradePriceTrHrs": 6.97,
+            "lastTradeSize": 1000,
+            "lastTradeTick": "Up",
+            "lastTradeTime": "2018-02-07T15:59:59.259000-05:00",
+            "low52w": 1.03,
+            "lowPrice": 6.88,
+            "openPrice": 7.64,
+            "symbol": "EMH.VN",
+            "symbolId": 10164524,
+            "tier": "",
+            "volume": 5357805
+        },
+        {
+            "VWAP": 29.445855,
+            "askPrice": 55,
+            "askSize": 2,
+            "bidPrice": 27.63,
+            "bidSize": 20,
+            "delay": 0,
+            "high52w": 44,
+            "highPrice": 31.35,
+            "isHalted": false,
+            "lastTradePrice": 28.25,
+            "lastTradePriceTrHrs": 27.62,
+            "lastTradeSize": 100,
+            "lastTradeTick": "Up",
+            "lastTradeTime": "2018-02-07T16:16:17.723000-05:00",
+            "low52w": 6.58,
+            "lowPrice": 26.66,
+            "openPrice": 30.43,
+            "symbol": "WEED.TO",
+            "symbolId": 16529510,
+            "tier": "",
+            "volume": 14762722
+        },
+        {
+            "VWAP": 18.353787,
+            "askPrice": 19,
+            "askSize": 4,
+            "bidPrice": 10,
+            "bidSize": 1,
+            "delay": 0,
+            "high52w": 31.25,
+            "highPrice": 18.99,
+            "isHalted": false,
+            "lastTradePrice": 17.8,
+            "lastTradePriceTrHrs": 17.87,
+            "lastTradeSize": 100,
+            "lastTradeTick": "Down",
+            "lastTradeTime": "2018-02-07T16:00:00.201000-05:00",
+            "low52w": 6.81,
+            "lowPrice": 17.33,
+            "openPrice": 18.71,
+            "symbol": "LEAF.TO",
+            "symbolId": 17821824,
+            "tier": "",
+            "volume": 1322510
+        },
+        {
+            "VWAP": 19.492624,
+            "askPrice": 25.18,
+            "askSize": 1,
+            "bidPrice": 10.31,
+            "bidSize": 5,
+            "delay": 0,
+            "high52w": 25.56,
+            "highPrice": 20.7,
+            "isHalted": false,
+            "lastTradePrice": 16.70,
+            "lastTradePriceTrHrs": 18.74,
+            "lastTradeSize": 100,
+            "lastTradeTick": "Down",
+            "lastTradeTime": "2018-02-07T15:59:49.451000-05:00",
+            "low52w": 8.36,
+            "lowPrice": 18.18,
+            "openPrice": 19.97,
+            "symbol": "HMMJ.TO",
+            "symbolId": 18022628,
+            "tier": "",
+            "volume": 2427378
+        },
+        {
+            "VWAP": 7.620155,
+            "askPrice": 7.75,
+            "askSize": 20,
+            "bidPrice": 5.66,
+            "bidSize": 30,
+            "delay": 0,
+            "high52w": 9.8,
+            "highPrice": 8.05,
+            "isHalted": false,
+            "lastTradePrice": 7.53,
+            "lastTradePriceTrHrs": 7.53,
+            "lastTradeSize": 400,
+            "lastTradeTick": "Equal",
+            "lastTradeTime": "2018-02-07T15:59:55.899000-05:00",
+            "low52w": 1.52,
+            "lowPrice": 7.06,
+            "openPrice": 7.69,
+            "symbol": "VFF.TO",
+            "symbolId": 40747,
+            "tier": "",
+            "volume": 828156
+        }
+    ]
+}