I’ll get right to it: both the stock Nightwatch configuration file (as of at least Nightwatch v. 2.0.9) and the Nightwatch docs are inaccurate for using the geckodriver web driver (specifically, v. 0.30.0) to run tests. Here is what you need to do, isolated to the firefox
environment portion of the test_settings
object in a nightwatch.conf.js
file:
module.exports = {
// snip, snip, snippety-snip
test_settings: {
// more snipping...
firefox: {
capabilities : {
browserName : 'firefox',
acceptInsecureCerts: true,
'moz:firefoxOptions': {
args: [
// '-headless',
// '-verbose'
],
prefs: {
// 'media.navigator.permission.disable': true,
// 'media.navigator.streams.fake': true
}
}
},
webdriver: {
start_process: true,
server_path: '',
host: '127.0.0.1',
port: 4444,
cli_args: [
// very verbose geckodriver logs
// '-vv'
]
}
}
}
};
Curious about what’s going on? I’ll elaborate, property by significant property:
- The property you want is
capabilities
, notdesiredCapabilities
. Thecapabilities
property is what ultimately shipped in the WebDriver specification. While it seems that both geckodriver and chromedriver continue to support the olderdesiredCapabilities
,capabilities
is the property you want now and into the future. - The
acceptInsecureCerts
property should be a member directly oncapabilities
; this too is in the WebDriver spec. And in testing today, it seems that some combo of Nightwatch and geckodriver ignoreacceptInsecureCerts
in any other location. - For Firefox-specific options (like command-line
args
and browser about:configprefs
), the property to use ismoz:firefoxOptions
. That is shipping in the latest defaultnightwatch.conf.js
file, as is the parallelgoog:chromeOptions
for chromedriver. But if you've got a legacy configuration file—like I did—you'll want to update the oldchromeOptions
property, too. - For local testing, you’ll want to set an IPv4 address to your local loopback for the
host
property onwebdriver
. On the Macs I was working on (one Big Sur, one Monterey),localhost
was resolving to the IPv6::1
adddress. Geckodriver was refusing the connection on that, as I discovered by runningwget
out of desperation.wget
then retried on127.0.0.1
:
$ geckodriver
1648330755779 geckodriver INFO Listening on 127.0.0.1:4444
# separate terminal process, with geckodriver still running:
$ wget http://localhost:4444/
--2022-03-26 16:49:18-- http://localhost:4444/
Resolving localhost (localhost)... ::1, 127.0.0.1
Connecting to localhost (localhost)|::1|:4444... failed: Connection refused.
Connecting to localhost (localhost)|127.0.0.1|:4444... connected.
HTTP request sent, awaiting response... 405 Method Not Allowed
2022-03-26 16:49:18 ERROR 405: Method Not Allowed.
The 405 error is expected: there's no meaningful resource on the geckodriver for GET /
. But the Nightwatch test-runner (I assume) did not attempt such a retry. Instead, it left behind a seemingly impossible error message of Failed to connect to GeckoDriver on 127.0.0.1 with port 4444
.
Bonus information: geckodriver now supports parallel testing, where two browsers can be open once! This is important for me, as I’m using Nightwatch to test out the code I’ve been writing for my book on WebRTC. I’ll save the full instructions for how to pull off parallel tests in full for another post, but essentially, you just need two different environments (I have firefoxActive
and firefoxPassive
, rather than just firefox
). And each environment must have its own webdriver process on its own port. So 4444
(the default) on one, and say 4445
on another. When you go to run nightwatch, pass in the -e
argument with the two environments: npx nightwatch -e firefoxActive,firefoxPassive
.
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