How do you tell Karma to keep browser window open if tests fail?

Question

I'm currently trying to implement jasmine testing using karma and webpack, and the code is getting transpiled incorrectly, but I can't see what it is transpiled down to because the browser closes as soon as it opens and finds the syntax error. How can I configure karma or jasmine to keep the browser window open after an error occurs?

--single-run should do the trick for you, or { singleRun: false } in karma.conf.js — Anatoli Klamer, Mar 02 '17 at 19:36
@zxxc when I set singleRun to false, it opens the browser window and doesn't seem to load the tests. — James G., Mar 02 '17 at 19:40

Stout01 · Accepted Answer · 2018-12-17T22:11:53.833

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You want to call it with --single-run=false.

Try following this article: https://glebbahmutov.com/blog/debugging-karma-unit-tests/

edited Dec 17 '18 at 22:11

answered Mar 02 '17 at 21:35

Stout01

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This started working today, but it was not running the tests with this yesterday. Maybe restarting my computer affected the change? – James G. Mar 04 '17 at 00:45
If the option is not good enough for you: Try using Gulp plus Karma APIs browsers_change event: https://stackoverflow.com/questions/45352256/how-to-keep-browser-window-open-for-single-karma-run-until-i-close-it-once/45375346#45375346 – Stefan Jul 28 '17 at 13:58
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`Unknown option: '--single-run'` – Arun Dec 05 '18 at 15:57
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for the unknown option error, check https://stackoverflow.com/questions/50816917/angular-cli-6-unknown-option-singlerun – Manu Chadha Oct 13 '20 at 05:57
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Use `--watch` instead. – varogen Apr 28 '22 at 17:16
use --singleRun=false – Davide Apr 20 '23 at 09:40

How do you tell Karma to keep browser window open if tests fail?

1 Answers1