nightwatch-axe-core
v2.0.1
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Nightwatch.js commands for running aXe-core.
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Nightwatch aXe-core
Nightwatch.js commands for running aXe-core.
Installation
Install using yarn or npm
npm install nightwatch-axe-core --save-dev
Add these commands to the custom_commands_path
in your Nightwatch.js configuration.
{
custom_commands_path : [
"./node_modules/nightwatch-axe-core/commands"
]
}
Configuration & Usage
The axe()
command takes the following two parameters:
Parameter Name | Parameter Type | Description ------------- | ---------------- | ----------- context | string or object | css selector or include/exclude object options | object | set of axe options
These can be defined globally and/or per call to the axe()
command.
In addition to the standard aXe options
:
options.timeout
configures Nightwatch'stimeoutsAsyncScript()
amount, default value is1000 milliseconds
.
aXe can require a fair amount of time to run, so increasing the timeout
option is often required.
Injecting aXe-core
Since Nightwatch 2.3.6, axe is included by default, but still requires calling both axeInject()
and axeRun()
. This command handles both.
Global configuration file
Create an axe.conf.js
file in your project root as an CommonJS module that exports a default object with both the
context
and options
parameters:
// axe.conf.js
module.exports = {
context: {
include: [['html']],
exclude: [['.advertising']],
},
options: {
runOnly: {
type: 'tag',
values: ['wcag2a', 'wcag2aa'],
},
timeout: 2000,
}
};
Then your test simply needs to call the axe()
command.
// nightwatch-test.js
export default {
'@tags': ['accessibility'],
'Thing passes aXe-core checks': function (browser) {
browser
.url(`${browser.launch_url}/page-to-test`)
.waitForElementPresent('.thing-to-test')
.axe()
.end()
}
}
Per test configuration
When calling axe()
you can can pass in the context
and options
values as arguments. context
will override
any globally defined contexts, whilst options
will be merged with any globally defined options. This way you can
have edge case tests that inherit global config but can easily be change one or two things.
axe(context, options)
For example;
// nightwatch-test.js
export default {
'@tags': ['accessibility'],
'Thing passes aXe-core checks': function (browser) {
browser
.url(`${browser.launch_url}/page-to-test`)
.waitForElementPresent('.thing-to-test')
.axe('.thing-to-test', {
runOnly: {
type: 'tag',
values: ['wcag2a']
},
rules: {
'color-contrast': { enabled: true },
'valid-lang': { enabled: false }
},
})
.end()
}
}
Debugging
When debugging a failure it can be useful to enable all of the output options, and set a large timeout;
options: {
timeout: 60000,
verbose: true,
selectors: true,
absolutePaths: true,
ancestry: true,
elementRef: true,
}
This will give you as much information as possible into what caused the failure.
Another helpful option is setting resultTypes: ['violations']
, as described in the
axe-core docs
which can improve performance and reduce timeout failures.