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cucumber-api.js
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cucumber-api.js
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const pify = require('pify')
const co = require('co')
const tmp = pify(require('tmp'), { include: ['file'] })
const fs = pify(require('fs'), { include: ['readFile', 'writeFile', 'unlink'] })
const Cucumber = {
Cli: require('cucumber/lib/cli').default,
userCodeRunner: require('cucumber/lib/user_code_runner').default,
Attachment: require('cucumber/lib/runtime/attachment_manager/attachment').default,
statuses: require('cucumber/lib/status').default
}
tmp.setGracefulCleanup()
module.exports = class CucumberAPI {
addAttachmentProvider (attachmentProvider) {
this.attachmentProvider = attachmentProvider
this.addStepDefinitionRunner()
}
isCucumberListener (fn) {
return (/handle(Step|Features)Result/).test(fn.name) ||
(/handle(Before|After)(Scenario|Feature|Features)/).test(fn.name)
}
isStepDefinitionAsynchronous (stepDefinition, parameters) {
return stepDefinition.length === parameters.length + 1
}
* handleAttachments (stepResult) {
try {
const feature = stepResult.step.scenario.feature.name
const scenario = stepResult.step.scenario.name
const attachment = yield * this.attachmentProvider(feature, scenario)
if (attachment) {
stepResult.attachments.push(new Cucumber.Attachment({
data: attachment.data,
mimeType: attachment.mimeType
}))
}
} catch (err) {
console.error(err)
}
}
wrapStepDefinition (code, parameters) {
const self = this
if (this.isCucumberListener(code) && parameters.length && 'attachments' in parameters[0]) {
const stepResult = parameters[0]
if (
this.attachmentProvider &&
stepResult.status === Cucumber.statuses.FAILED &&
!stepResult._handledByNightwatchCucumber
) {
stepResult._handledByNightwatchCucumber = true
return co.wrap(function * () {
yield * self.handleAttachments(stepResult)
code.apply(this, arguments)
})
}
}
return code
}
addStepDefinitionRunner () {
const self = this
const originalUserCodeRunnerRun = Cucumber.userCodeRunner.run
Cucumber.userCodeRunner.run = co.wrap(function * (args) {
args.fn = self.wrapStepDefinition(args.fn, args.argsArray)
return yield originalUserCodeRunnerRun.call(this, args)
})
}
* run (args) {
const cli = new Cucumber.Cli({
argv: process.argv.slice(0, 2).concat(args),
cwd: process.cwd(),
stdout: process.stdout
})
return yield cli.run()
}
getJSONReportName (args) {
const pattern = /^json:(.*)$/
let i = 0
while (i < args.length - 2 && !(args[i] === '--format' && pattern.test(args[i + 1]))) {
i++
}
if (i < args.length - 2) {
return args[i + 1].match(pattern)[1]
}
}
isBooleanArg (args, index) {
const nextIndex = index + 1
return args[nextIndex].startsWith('--') || nextIndex === args.length - 1
}
getFeatureFiles (args) {
const featureFiles = []
let i = 0
while (i < args.length) {
if (args[i].startsWith('--')) {
i += this.isBooleanArg(args, i) ? 1 : 2
} else {
featureFiles.push(args[i])
i++
}
}
return featureFiles
}
getAdjustedArgs ({args, featureFiles, jsonReport, tags}) {
const result = []
let i = 0
while (i < args.length) {
if (args[i] === '--format' && args[i + 1].startsWith('json:')) {
result.push('--format')
result.push(`json:${jsonReport}`)
i += 2
} else if (args[i].startsWith('--')) {
result.push(args[i])
if (this.isBooleanArg(args, i)) {
i++
} else {
result.push(args[i + 1])
i += 2
}
} else {
i++
}
}
tags.forEach((tag) => {
result.push('--tags')
result.push(tag)
})
featureFiles.forEach((featureFile) => {
result.push(featureFile)
})
return result
}
* mergeCucumberJsonReports (reports, target) {
let sumReport = []
for (let i = 0; i < reports.length; i++) {
const report = JSON.parse(yield fs.readFile(reports[i]))
sumReport = sumReport.concat(report)
yield fs.unlink(reports[i])
}
yield fs.writeFile(target, JSON.stringify(sumReport, null, 2))
}
}