Testing with Selenium Grid get SessionNotCreatedException

[clobob]

I'm trying to run a test in examples\visual_testing. The command which I used like this:

pytest python_home_test.py --server=192.168.1.101 --cap_file=..\capabilities\local_cap_file_firefox.py --browser=remote

Selenium Grid docker -->> selenium/hub, selenium/node-firfox
OS: Linux localhost.localdomain 3.10.0-862.9.1.nd7.zx.4.x86_64 #1 SMP Wed Jan 9 01:27:43 CST 2019 x86_64 x86_64 x86_64 GNU/Linux

Selenium grid looks working ok.

after running test, I get a failed with stacktrace:

E selenium.common.exceptions.SessionNotCreatedException: Message: Unable to create session from {
E "desiredCapabilities": {
E "server:CONFIG_UUID": "e9e2ba04-f65c-42c6-830b-3ad01b57e376",
E "os": "LINUX",
E "browser": "firefox"
E },
E "capabilities": {
E "firstMatch": [
E {
E "server:CONFIG_UUID": "e9e2ba04-f65c-42c6-830b-3ad01b57e376"
E }
E ]
E }
E }
E Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:25:53'
E System info: host: '9636b7966d94', ip: '172.17.0.3', os.name: 'Linux', os.arch: 'amd64', os.version: '3.10.0-862.9.1.nd7.zx.4.x86_64', java.version: '1.8.0_252'
E Driver info: driver.version: unknown
E Stacktrace:
E at org.openqa.selenium.remote.server.NewSessionPipeline.lambda$null$4 (NewSessionPipeline.java:76)
E at java.util.Optional.orElseThrow (Optional.java:290)
E at org.openqa.selenium.remote.server.NewSessionPipeline.lambda$createNewSession$5 (NewSessionPipeline.java:75)
E at java.util.Optional.orElseGet (Optional.java:267)
E at org.openqa.selenium.remote.server.NewSessionPipeline.createNewSession (NewSessionPipeline.java:73)
E at org.openqa.selenium.remote.server.commandhandler.BeginSession.execute (BeginSession.java:65)
E at org.openqa.selenium.remote.server.WebDriverServlet.lambda$handle$0 (WebDriverServlet.java:235)
E at java.util.concurrent.Executors$RunnableAdapter.call (Executors.java:511)
E at java.util.concurrent.FutureTask.run (FutureTask.java:266)
E at java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1149)
E at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:624)
E at java.lang.Thread.run (Thread.java:748)

......\envs\seleniumbase_env\lib\site-packages\selenium\webdriver\remote\errorhandler.py:242: SessionNotCreatedException

can you have a look at this issue?

[mdmintz]

@clobob This might be related to your settings in local_cap_file_firefox.py. I'd need to see what you set in there to debug your issue. Do your tests work with a different desired_capabilities file?

[clobob]

Hi,
here it is.
desired_cap = {
'os': 'LINUX',
'browser': 'firefox',
}

[mdmintz]

@clobob If the Selenium Grid nodes that are connected to your Grid Hub are only on Linux machines, you shouldn't need to specify Linux in your desired capabilities. And if none of the Grid Nodes are on Linux, it will have errors. The Desired Capabilities feature that's built-in to SeleniumBase is primarily made for connecting to giant Selenium Grids held by companies such as BrowserStack, Sauce Labs, TestingBot, CrossBrowserTesting, and LambdaTest, which have Selenium Grid nodes running on all kinds of environments. Details on those are here: https://seleniumbase.io/seleniumbase/utilities/selenium_grid/ReadMe/
Although SeleniumBase lets you spin up a Selenium Grid Hub and Selenium Grid nodes, your environment might not support all the desired capabilities that are specified in your desired capabilities file.

[clobob]

@mdmintz
I feel there is still something wrong in seleniumbase.

1. I built an evironment in CentOS7 + python 3.6.8 + seleniumbase + docker selenium/hub:latest + docker selenium/node-firefox:latest
2. I try original selenium to access grid by using follow codes ==>> demo_test.py

from selenium.webdriver import Remote

driver = Remote(command_executor='http://10.0.2.15:4444/wd/hub/',desired_capabilities={'browserName':'firefox'})

driver.get("http://www.baidu.com")
print(driver.title)
driver.close()

the command is : python demo_test.py -v
and it works. site's title is print on screen.

3. Try to run ==>> pytest python_home_test.py --server=10.0.2.15 --browser=remote cap_file=cap_file.py
   I got SessionNotCreateException like i mentioned in this issue.
   the code in cap_file.py ==>>
   desired_cap={"browser":"firefox"}

[mdmintz]

@clobob Try the Selenoid Docker image. There's an example here: https://github.com/mpolynskyi/orbitz_seleniumbase
It could be that some Docker images are incompatible with SeleniumBase, possibly something on their end. In any case, there are Docker images that have perfect compatibility with SeleniumBase, which means the issue might be with the selenium/hub:latest Docker image.

[mdmintz]

And there's https://github.com/seleniumbase/SeleniumBase/releases/tag/v1.38.5 which fixes the issue with Remote WebDriver and Selenium Grid