Originally posted by:linclark see https://github.com/devtools-html/gecko-dev/issues/230 Currently pageErrors are tested with integration tests. We can convert these into unit tests. The backend test would still be a mochitest. It should load the test page and ensure the correct packet is sent, comparing to a stub packet. The frontend can then use that stub in a mocha test. Tests to convert (list in progress): - [ ] browser_webconsole_bug_737873_mixedcontent.js - [ ] browser_webconsole_trackingprotection_errors.js - [ ] browser_webconsole_bug_770099_violation.js - [ ] browser_webconsole_bug_762593_insecure_passwords_web_console_warning.js - [ ] browser_webconsole_bug_762593_insecure_passwords_about_blank_web_console_warning.js - [ ] browser_bug1045902_console_csp_ignore_reflected_xss_message.js