diff --git a/s3tests/functional/test_headers.py b/s3tests/functional/test_headers.py
index b8a429d..9186a04 100644
--- a/s3tests/functional/test_headers.py
+++ b/s3tests/functional/test_headers.py
@@ -225,3 +225,27 @@ def test_object_create_bad_contenttype_unreadable():
     eq(e.status, 403)
     eq(e.reason, 'Forbidden')
     assert e.error_code in ('AccessDenied', 'SignatureDoesNotMatch')
+
+
+@nose.with_setup(teardown=_clear_custom_headers)
+def test_object_create_bad_ua_invalid():
+    key = _setup_bad_object({'User-Agent': ''})
+    key.set_contents_from_string('bar')
+
+
+@nose.with_setup(teardown=_clear_custom_headers)
+def test_object_create_bad_ua_empty():
+    key = _setup_bad_object({'User-Agent': ''})
+    key.set_contents_from_string('bar')
+
+
+@nose.with_setup(teardown=_clear_custom_headers)
+def test_object_create_bad_ua_unreadable():
+    key = _setup_bad_object({'User-Agent': '\x07'})
+    key.set_contents_from_string('bar')
+
+
+@nose.with_setup(teardown=_clear_custom_headers)
+def test_object_create_bad_ua_none():
+    key = _setup_bad_object(remove=('User-Agent',))
+    key.set_contents_from_string('bar')