diff --git a/test/mitmproxy/test_examples.py b/test/mitmproxy/test_examples.py
index 16607a1b4..8b6e0eabb 100644
--- a/test/mitmproxy/test_examples.py
+++ b/test/mitmproxy/test_examples.py
@@ -7,6 +7,7 @@ from netlib.http import Headers
 from . import tservers, tutils
 
 from examples import (
+    add_header,
     modify_form,
 
 )
@@ -38,6 +39,12 @@ def test_load_scripts():
             s.unload()
 
 
+def test_add_header():
+    flow = tutils.tflow(resp=netutils.tresp())
+    add_header.response({}, flow)
+    assert flow.response.headers["newheader"] == "foo"
+
+
 def test_modify_form():
     form_header = Headers(content_type="application/x-www-form-urlencoded")
     flow = tutils.tflow(req=netutils.treq(headers=form_header))