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Hey I currently using selenium webdriver, mocha, Browserstack and a node.js package called "looks-same" for an automated visual regression. I am just trying to do a simple comparison with a reference image I have stored and a snap shot I get from selenium.

The code seems to work fine when I run selenium locally but when I use Browserstack, it works sometimes but most of the time it throws an error.

The Error:

events.js:183
      throw er; // Unhandled 'error' event
      ^

Error: Unexpected end of input
    at module.exports.ChunkStream._end (/home/david/Desktop/Camera/node_modules/pngjs/lib/chunkstream.js:100:7)
    at module.exports.ChunkStream._process (/home/david/Desktop/Camera/node_modules/pngjs/lib/chunkstream.js:203:12)
    at module.exports.<anonymous> (/home/david/Desktop/Camera/node_modules/pngjs/lib/chunkstream.js:32:10)
    at _combinedTickCallback (internal/process/next_tick.js:132:7)
    at Immediate._tickCallback [as _onImmediate] (internal/process/next_tick.js:181:9)
    at runCallback (timers.js:810:20)
    at tryOnImmediate (timers.js:768:5)
    at processImmediate [as _immediateCallback] (timers.js:745:5)

These are my browser stack capabilities:

const browserStackCapabilities = {
    'browserName' : 'android',
    'device' : 'Samsung Galaxy S8',
    'realMobile' : 'true',
    'os_version' : '7.0',
    'browserstack.debug' : 'true'
}

This is the code:

it('Should compare screenshot of homepage', function() {
    this.timeout(50000)
    return new Promise( async (resolve, reject) => {
        await browser.get(serverUri)

        await browser.saveScreenshot('homePage.png')

        await looksSame('homePageReference.png', 'homePage.png', function(error, {equal}) {
            console.log(equal)
            console.log(error)

            expect(equal).to.equal(true)
        });
        resolve()
        browser.quit()
    })
})

I expect it to continuously compare the images and give a result either true or false using Browerstack.

Did I do something wrong with error handling?

Improve this question
3
  • At least in the snippet shown above you need another closing bracket and parenthesis at the end of the test.. May I assume that's just left off here? Commented Mar 29, 2019 at 3:08
  • @C.Peck sorry that was a mistake edited, thank you. Commented Mar 29, 2019 at 3:15
  • Ok let’s see... you say it works “sometimes but most of the time throws an error”. Is it that same error every time? Are you able to tell which line invokes the error? Commented Mar 29, 2019 at 13:16
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