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Detect javascript errors when visiting a new web page #185

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Detect javascript errors when visiting a new web page #185

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TerjeBr
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@TerjeBr TerjeBr commented Nov 23, 2017 •
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This makes it possible to see what is going on if you visit a web page and it has javascript errors, or the page fails to load for other reasons (f.ex. the server might be down).

Without this fix, after you visit you just get http code 0 instead of 200, and you will not know what is going on.

aik099
aik099 reviewed Nov 23, 2017
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src/ZombieDriver.php
@@ -125,7 +125,10 @@ public function visit($url)
}
});
JS;
$this->server->evalJS($js);
$out = $this->server->evalJS($js);
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  1. Are you sure, that JavaScript errors (if any) will be returned as method call result?
  2. Does same error catching technique apply to other js-enabled drivers, like Selenium?

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@aik099 visiting a URL in Selenium uses a native Selenium method. So we don't need to implement error handling (Selenium does).

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@aik099 see the JS code just above. On error, it outputs some stuff to the stream.

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The zombie "browser" object's method "visit" has a callback as its second argument that will be called if an error occurs. Currently this error information is just thrown away. I found it very helpful to have this error information in my project when making behat tests.

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@stof has been quiet on this. I guess it is ok as it is then?

stof
stof reviewed Nov 23, 2017
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src/ZombieDriver.php Outdated
$this->server->evalJS($js);
$out = $this->server->evalJS($js);
if (!empty($out)) {
throw new DriverException(sprintf('Error when loading page %s: %s', $url, $out));
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The right fix would rather be to prefix the error output with ZombieServer::ERROR_PREFIX and then evalJS will throw the exception for us.

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@TerjeBr TerjeBr Nov 24, 2017 •
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Then you will not get the same degree of specialized error message. You will get a more general error message, and you will not readily see the url that it tried to visit.

You can also see that the same coding pattern is applied to the click function at line 719, and also in triggerBrowserEvent at line 890

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TerjeBr commented Jan 26, 2018

@aik099 Anything I can do to get this PR accepted?

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aik099 commented Jan 26, 2018

I guess you can show error output example of your code compared to what it would be for @stof recommended approach. That should help @stof decide if your approach would be better.

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TerjeBr commented May 14, 2018 •
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Here is an example of what happens when the php server is runnung at the not expected port.
First with my fix:

    And I am on the web page "view quote" with id "300"                                              # WebContext::iAmOnTheWebPageWithId()
      Error when loading page http://localhost:8383/quote/300: "TypeError: connect ECONNREFUSED 127.0.0.1:8383\n    at /usr/lib/node_modules/zombie/lib/pipeline.js:89:15\n    at tryCatcher (/usr/lib/node_modules/zombie/node_modules/bluebird/js/release/util.js:16:23)\n    at Promise._settlePromiseFromHandler (/usr/lib/node_modules/zombie/node_modules/bluebird/js/release/promise.js:512:31)\n    at Promise._settlePromise (/usr/lib/node_modules/zombie/node_modules/bluebird/js/release/promise.js:569:18)\n    at Promise._settlePromise0 (/usr/lib/node_modules/zombie/node_modules/bluebird/js/release/promise.js:614:10)\n    at Promise._settlePromises (/usr/lib/node_modules/zombie/node_modules/bluebird/js/release/promise.js:689:18)\n    at Async._drainQueue (/usr/lib/node_modules/zombie/node_modules/bluebird/js/release/async.js:133:16)\n    at Async._drainQueues (/usr/lib/node_modules/zombie/node_modules/bluebird/js/release/async.js:143:10)\n    at Immediate.Async.drainQueues (/usr/lib/node_modules/zombie/node_modules/bluebird/js/release/async.js:17:14)\n    at runCallback (timers.js:651:20)\n    at tryOnImmediate (timers.js:624:5)\n    at processImmediate [as _immediateCallback] (timers.js:596:5)" (Behat\Mink\Exception\DriverException)

Here is how it will look if we do it the way @stof suggested:

    And I am on the web page "view quote" with id "300"                                              # WebContext::iAmOnTheWebPageWithId()
      Error "TypeError: connect ECONNREFUSED 127.0.0.1:8383
          at /usr/lib/node_modules/zombie/lib/pipeline.js:89:15
          at tryCatcher (/usr/lib/node_modules/zombie/node_modules/bluebird/js/release/util.js:16:23)
          at Promise._settlePromiseFromHandler (/usr/lib/node_modules/zombie/node_modules/bluebird/js/release/promise.js:512:31)
          at Promise._settlePromise (/usr/lib/node_modules/zombie/node_modules/bluebird/js/release/promise.js:569:18)
          at Promise._settlePromise0 (/usr/lib/node_modules/zombie/node_modules/bluebird/js/release/promise.js:614:10)
          at Promise._settlePromises (/usr/lib/node_modules/zombie/node_modules/bluebird/js/release/promise.js:689:18)
          at Async._drainQueue (/usr/lib/node_modules/zombie/node_modules/bluebird/js/release/async.js:133:16)
          at Async._drainQueues (/usr/lib/node_modules/zombie/node_modules/bluebird/js/release/async.js:143:10)
          at Immediate.Async.drainQueues (/usr/lib/node_modules/zombie/node_modules/bluebird/js/release/async.js:17:14)
          at runCallback (timers.js:651:20)
          at tryOnImmediate (timers.js:624:5)
          at processImmediate [as _immediateCallback] (timers.js:596:5)" while executing code: pointers = [];
      browser.visit("http://localhost:8383/quote/300", function (err) {
        if (err) {
          stream.end('CAUGHT_ERROR:' + JSON.stringify(err.stack));
        } else {
          stream.end();
        }
      }); (Behat\Mink\Exception\DriverException)

You see that the second error message has no information the url of that zombie tried to connect to when the error happened.

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3 participants
@TerjeBr @aik099 @stof