diff --git a/actionpack/test/template/text_helper_test.rb b/actionpack/test/template/text_helper_test.rb
index d173c5be0a22b..d22b9fe406f07 100644
--- a/actionpack/test/template/text_helper_test.rb
+++ b/actionpack/test/template/text_helper_test.rb
@@ -435,6 +435,7 @@ def test_auto_link_other_protocols
     z39_scheme    = 'z39.50r://host:696/db'
     chrome_scheme = 'chrome://package/section/path'
     view_source   = 'view-source:http://en.wikipedia.org/wiki/URI_scheme'
+    assert_equal generate_result(file_scheme), auto_link(file_scheme)
     assert_equal generate_result(z39_scheme), auto_link(z39_scheme)
     assert_equal generate_result(chrome_scheme), auto_link(chrome_scheme)
     assert_equal generate_result(view_source), auto_link(view_source)