diff --git a/cover.sh b/cover.sh
index ce4a1db..44f751a 100755
--- a/cover.sh
+++ b/cover.sh
@@ -1,3 +1,3 @@
 #!/usr/bin/env bash
 
-nosetests --with-coverage --cover-package=falcon
+nosetests --with-coverage --cover-package=falcon --cover-min-percentage=90
diff --git a/falcon/test/test_headers.py b/falcon/test/test_headers.py
index 6916b0f..dab3d3e 100644
--- a/falcon/test/test_headers.py
+++ b/falcon/test/test_headers.py
@@ -48,6 +48,12 @@ class TestHeaders(helpers.TestSuite):
         content_length_header = ('Content-Length', content_length)
         self.assertThat(headers, Contains(content_length_header))
 
+    def test_default_value(self):
+        self._simulate_request(self.test_route)
+
+        value = self.resource.req.get_header('X-Not-Found', '876')
+        self.assertEquals(value, '876')
+
     def test_prefer_host_header(self):
         self._simulate_request(self.test_route)
 
diff --git a/falcon/test/test_httperror.py b/falcon/test/test_httperror.py
index 1855148..14f1205 100644
--- a/falcon/test/test_httperror.py
+++ b/falcon/test/test_httperror.py
@@ -38,7 +38,6 @@ class UnauthorizedResource:
                                       'Missing or invalid token header.',
                                       'Token')
 
-
 class NotFoundResource:
 
     def on_get(self, req, resp):
@@ -50,6 +49,13 @@ class MethodNotAllowedResource:
         raise falcon.HTTPMethodNotAllowed(['PUT'])
 
 
+class InternalServerErrorResource:
+
+    def on_get(self, req, resp):
+        raise falcon.HTTPInternalServerError('Excuse Us', 'Something went'
+                                             'boink!')
+
+
 class TestHTTPError(helpers.TestSuite):
 
     def prepare(self):
@@ -168,3 +174,9 @@ class TestHTTPError(helpers.TestSuite):
         self.assertEqual(self.srmock.status, falcon.HTTP_405)
         self.assertEqual(body, [])
         self.assertIn(('Allow', 'PUT'), self.srmock.headers)
+
+    def test_500(self):
+        self.api.add_route('/500', InternalServerErrorResource())
+        body = self._simulate_request('/500')
+
+        self.assertEqual(self.srmock.status, falcon.HTTP_500)