1 files changed, 6 insertions, 0 deletions
diff --git a/test/navigation.js b/test/navigation.js
index 9b17f7f..23d98ac 100644
--- a/test/navigation.js
+++ b/test/navigation.js
@@ -65,4 +65,10 @@ describe('Summary navigation', function() {
         assert.equal(nav['chapter-2/README.html'].level, '2');
         assert.equal(nav['chapter-3/README.html'].level, '3');
     });
+
+    it('should not accept null paths', function() {
+        var nav = navigation(LEXED);
+
+        assert(!nav[null]);
+    });
 });