Browser disconnected error. This problem may appear when a browser hangs or is closed, or due to network issues

[SynaQE]

Hi Testcafe team,

I run my tests nightly using Bamboo CI server and the daily test runs are failing because of the following issue:

Using locally installed version of TestCafe.
ERROR The Safari 10.1.1 / Mac OS X 10.12.5 browser disconnected. This problem may appear when a browser hangs or is closed, or due to network issues.

I use testcafe 'all' command (e.g testcafe all abc.js) to run scripts on Safari,Firefox & Chrome on Mac machine. Version of each provided below:

TestCafe ver: 0.16.2
Mac OS: 10.12.5
Safari ver: 10.1.1
Chrome ver: 50.0.3071
Firefox ver: 54.0.1

What could be the problem here and why does the browser hang?

[churkin]

Hi,

Unfortunately, I can't find a solution using the information that you provided. The error says that testcafe lost connection with one of the browsers. First, I suggest you try to find the problematic browser - run tests differently in each of them. After this, watch for the behavior of the problematic browser - it should open, should run tests, and should not hang on testing.

Let me know your results.

[SynaQE]

Hi @churkin

I investigated and as far as I can tell, the issue occurs when running along with Firefox browser. Another user has reported the similar issue here

Here are my results:

FAIL - when run with 'safari, chrome,firefox' browsers multiple times (Note: First run from clean state is always fine. Subsequent runs fail because Safari browser froze while running the tests)
PASS - when run with just 'safari' multiple times
PASS - when run with just 'chrome' multiple times
PASS - when run with just 'firefox' multiple times
PASS - when run with 'safari,chrome' multiple times

Could Firefox browser be doing something to cause this issue?

[churkin]

Hi,
Thank you for the additional information about the problem. I will investigate it and let you know as soon as we have any results.