Java Selenium testing, can we get javaScript variables to assert

Question

I want to test a front end vanilla javascript using Selenium in java. I can easily open the page click on some stuff etc, but I couldn't figure out exactly what is the best practices to assert tests. Mainly, can we get the variables after clicking on some buttons, for example let's say:

function button(){
  variable = 2;
}

Let's say some button calls the function above, in selenium I can click on the function but is there a way to call the variable and do something like;

AssertEquals(2, driver.getVariableFromJavascriptAfterClick())

If not, how should I test something like that.

Thanks

Prophet · Accepted Answer · 2021-10-26 15:25:36Z

0

Looks like all you need to do is

JavascriptExecutor js = (JavascriptExecutor) driver;
int val = js.executeScript("return button();");
AssertEquals(2, val);

For more details see this reference

answered Oct 26, 2021 at 15:25

Prophet

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5 Comments

browsermator Over a year ago

I think button() would have to return a value for that to work, no?

Prophet Over a year ago

You are right.. If so, is it possible to fix this issue?

browsermator Over a year ago

well, the example javascript function there is not really usable... I think the OP needs to provide a specific example of what they're trying to do. Personally I'd focus on the DOM for Selenium tests. To test the javascript portion of the page I think a "debug" version of the site should be created. You could expose some things to the DOM/Selenium for convenience.

golgetahir Over a year ago

Hey guys, thank you for attention and answers. I am trying to build an autonomous testing for a web page @pcalkins .The real question is what is the best practices for opening the webpage ( either with mock objects or real ) and running it to see the output of some methods and making assertions. For example if I open the page with selenium and click on some stuff, can I get the related functions outputs at that run, no right? Executor seems it will run only that method, and global variables etc. links will be missing. Maybe I am thinking like testing a java code, can you guide me here.

browsermator Over a year ago

I don't know much about "best practices"... but I'd use Selenium to test the front-end. So make sure that whatever that javascript does is reflected in the DOM. For testing Javascript I would go another route. Maybe build asserts into the scripts. For convenience, you might expose some of the javascript return objects to the DOM so Selenium can check them.

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