Use Selenium WebDriver to make assertion on JavaScript variable

Question

I'm testing a webpage with Selenium WebDrive and want to make an assertion on a JavaScript file but not sure how.

I want to assert that servers (an array) is of length 2.

My JavaScript file config.js contains the following array I wish to assert is present:

var location = location || {};
location.Config = {
    servers: [
        {name: "a"}, 
        {name: "b"}
   ]
}

My first attempt was to use className but didn't do the trick:

Assert.assertThat(webDriver
        .findElement(className("config.js"))
        .getAttribute("servers")
        .length(), 
    Matchers.is(2));

The "config.js" file is within the site being tested and the webdriver has a handle into the site. I hope I've not misunderstood your question — Matthew
– Matthew, Commented Mar 29, 2016 at 10:29
What do you get if you execute "location.Config.servers[0].name" is the console of the browser ? — Florent B.
– Florent B., Commented Mar 29, 2016 at 10:45

Matthew · Accepted Answer · 2016-03-29 10:52:31Z

1

Success!

Passing the browser a JavaScript command to run and capturing its result has done the trick.

long servers = (long) ((JavascriptExecutor) webDriver).executeScript("return location.Config.servers.length");

Assert.assertThat(servers, Matchers.greaterThan((long) 0));

answered Mar 29, 2016 at 10:52

Matthew

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