diff --git a/test/mitmproxy/script/test_concurrent.py b/test/mitmproxy/script/test_concurrent.py
new file mode 100644
index 000000000..a9c9e1531
--- /dev/null
+++ b/test/mitmproxy/script/test_concurrent.py
@@ -0,0 +1,32 @@
+from threading import Event
+
+from mitmproxy.script import Script
+from test.mitmproxy import tutils
+
+
+class Dummy:
+    def __init__(self, reply):
+        self.reply = reply
+
+
+@tutils.skip_appveyor
+def test_concurrent():
+    with Script(tutils.test_data.path("scripts/concurrent_decorator.py"), None) as s:
+        def reply():
+            reply.acked.set()
+        reply.acked = Event()
+
+        f1, f2 = Dummy(reply), Dummy(reply)
+        s.run("request", f1)
+        f1.reply()
+        s.run("request", f2)
+        f2.reply()
+        assert f1.reply.acked == reply.acked
+        assert not reply.acked.is_set()
+        assert reply.acked.wait(10)
+
+
+def test_concurrent_err():
+    s = Script(tutils.test_data.path("scripts/concurrent_decorator_err.py"), None)
+    with tutils.raises("Concurrent decorator not supported for 'start' method"):
+        s.load()
diff --git a/test/mitmproxy/scripts/concurrent_decorator.py b/test/mitmproxy/scripts/concurrent_decorator.py
index 6651c8115..cf3ab5128 100644
--- a/test/mitmproxy/scripts/concurrent_decorator.py
+++ b/test/mitmproxy/scripts/concurrent_decorator.py
@@ -1,32 +1,6 @@
 import time
 from mitmproxy.script import concurrent
 
-
-@concurrent
-def clientconnect(context, cc):
-    context.log("clientconnect")
-
-
-@concurrent
-def serverconnect(context, sc):
-    context.log("serverconnect")
-
-
 @concurrent
 def request(context, flow):
     time.sleep(0.1)
-
-
-@concurrent
-def response(context, flow):
-    context.log("response")
-
-
-@concurrent
-def error(context, err):
-    context.log("error")
-
-
-@concurrent
-def clientdisconnect(context, dc):
-    context.log("clientdisconnect")
diff --git a/test/mitmproxy/test_script.py b/test/mitmproxy/test_script.py
index b38ea041a..f321d15ce 100644
--- a/test/mitmproxy/test_script.py
+++ b/test/mitmproxy/test_script.py
@@ -1,6 +1,4 @@
-import time
-import mock
-from mitmproxy import script, flow
+from mitmproxy import flow
 from . import tutils
 
 
@@ -13,63 +11,3 @@ def test_duplicate_flow():
     assert fm.state.flow_count() == 2
     assert not fm.state.view[0].request.is_replay
     assert fm.state.view[1].request.is_replay
-
-
-@tutils.skip_appveyor
-def test_concurrent():
-    s = flow.State()
-    fm = flow.FlowMaster(None, s)
-    fm.load_script(tutils.test_data.path("scripts/concurrent_decorator.py"))
-
-    with mock.patch("mitmproxy.controller.DummyReply.__call__") as m:
-        f1, f2 = tutils.tflow(), tutils.tflow()
-        t_start = time.time()
-        fm.handle_request(f1)
-        f1.reply()
-        fm.handle_request(f2)
-        f2.reply()
-
-        # Two instantiations
-        assert m.call_count == 0  # No calls yet.
-        assert (time.time() - t_start) < 0.1
-
-
-def test_concurrent2():
-    s = flow.State()
-    fm = flow.FlowMaster(None, s)
-    s = script.Script(
-        tutils.test_data.path("scripts/concurrent_decorator.py"),
-        script.ScriptContext(fm))
-    s.load()
-    m = mock.Mock()
-
-    class Dummy:
-
-        def __init__(self):
-            self.response = self
-            self.error = self
-            self.reply = m
-
-    t_start = time.time()
-
-    for hook in ("clientconnect",
-                 "serverconnect",
-                 "response",
-                 "error",
-                 "clientconnect"):
-        d = Dummy()
-        s.run(hook, d)
-        d.reply()
-    while (time.time() - t_start) < 20 and m.call_count <= 5:
-        if m.call_count == 5:
-            return
-        time.sleep(0.001)
-    assert False
-
-
-def test_concurrent_err():
-    s = flow.State()
-    fm = flow.FlowMaster(None, s)
-    with tutils.raises("Concurrent decorator not supported for 'start' method"):
-        s = script.Script(tutils.test_data.path("scripts/concurrent_decorator_err.py"), fm)
-        s.load()
\ No newline at end of file