CONSOLE ERROR: line 1: Uncaught ReferenceError: undefined_variable is not defined
This is a testharness.js-based test.
FAIL
PASS window.onerror - runtime error in <script src=data:...> assert_equals: second arg expected "data:text/javascript,undefined_variable;" but got "" 
PASS window.onerror - runtime error in <script src=data:...> (column) 
Harness: the test ran to completion.