diff --git a/mitmproxy/test/tflow.py b/mitmproxy/test/tflow.py
index a93c86ddd..edf4d7a71 100644
--- a/mitmproxy/test/tflow.py
+++ b/mitmproxy/test/tflow.py
@@ -27,6 +27,7 @@ def ttcpflow(client_conn=True, server_conn=True, messages=True, err=None):
     f.reply = controller.DummyReply()
     return f
 
+
 def twebsocketflow(client_conn=True, server_conn=True, messages=True, err=None, handshake_flow=True):
 
     if client_conn is True:
diff --git a/test/mitmproxy/addons/test_disable_h2c_upgrade.py b/test/mitmproxy/addons/test_disable_h2c_upgrade.py
new file mode 100644
index 000000000..6cab713d1
--- /dev/null
+++ b/test/mitmproxy/addons/test_disable_h2c_upgrade.py
@@ -0,0 +1,17 @@
+from mitmproxy.addons import disable_h2c_upgrade
+from mitmproxy.test import tflow
+
+
+class TestTermLog:
+    def test_simple(self):
+        a = disable_h2c_upgrade.DisableH2CleartextUpgrade()
+
+        f = tflow.tflow()
+        f.request.headers['upgrade'] = 'h2c'
+        f.request.headers['connection'] = 'foo'
+        f.request.headers['http2-settings'] = 'bar'
+
+        a.request(f)
+        assert 'upgrade' not in f.request.headers
+        assert 'connection' not in f.request.headers
+        assert 'http2-settings' not in f.request.headers
diff --git a/test/mitmproxy/addons/test_dumper.py b/test/mitmproxy/addons/test_dumper.py
index 1a2639a2d..8fa8a22a0 100644
--- a/test/mitmproxy/addons/test_dumper.py
+++ b/test/mitmproxy/addons/test_dumper.py
@@ -166,6 +166,7 @@ def test_tcp():
         d.tcp_error(f)
         assert "Error in TCP" in sio.getvalue()
 
+
 def test_websocket():
     sio = io.StringIO()
     d = dumper.Dumper(sio)