diff --git a/test/individual_coverage.py b/test/individual_coverage.py
index 54180eaca..a77c3bd5c 100755
--- a/test/individual_coverage.py
+++ b/test/individual_coverage.py
@@ -26,12 +26,9 @@ def run_tests(src, test, fail):
                 test
             ])
 
-    if e == 0:
-        if fail:
+    if e == 0 and fail:
             print("FAIL DUE TO UNEXPECTED SUCCESS:", src, "Please remove this file from setup.cfg tool:individual_coverage/exclude.")
             e = 42
-        else:
-            print("Success:", src)
     else:
         if fail:
             print("Ignoring allowed fail:", src)
diff --git a/test/mitmproxy/addons/test_dumper.py b/test/mitmproxy/addons/test_dumper.py
index aeed8b114..187656606 100644
--- a/test/mitmproxy/addons/test_dumper.py
+++ b/test/mitmproxy/addons/test_dumper.py
@@ -125,8 +125,14 @@ def test_echo_body():
         d._echo_message(f.response, f)
         t = sio.getvalue()
         assert "cut off" in t
-        sio.truncate(0)
 
+
+def test_echo_trailer():
+    sio = io.StringIO()
+    sio_err = io.StringIO()
+    d = dumper.Dumper(sio, sio_err)
+    with taddons.context(d) as ctx:
+        ctx.configure(d, flow_detail=3)
         f = tflow.tflow(client_conn=True, server_conn=True, resp=True)
         f.response.headers["content-type"] = "text/html"
         f.response.headers["transfer-encoding"] = "chunked"