Find a way to clear the Selenium WebDriver cache programmatically

[ioannakok]

The Play framework runs integration tests with a TestBrowser that uses a Selenium WebDriver. Play 2.9 (see upgrade PR: #26783) changed the version of Selenium it depends on under the hood from 3.141.59 to 4.14.1. Before the Play 2.9 upgrade the following tests above could run one after the other without the first affecting the outcome of the second:

frontend/applications/test/GalleryTemplateTest.scala

Lines 55 to 73 in e762f8e

	it should "select the trail picture for the opengraph image when FacebookShareUseTrailPicFirstSwitch is ON" in {
	FacebookShareUseTrailPicFirstSwitch.switchOn()
	goTo("/lifeandstyle/gallery/2014/nov/24/flying-dogs-in-pictures?page=on") { browser =>
	import browser._
	$("meta[property='og:image']").attributes("content").asScala.head should include(
	"61e027cb-fec8-4aa3-a12b-e50f99493399-2060x1236.jpeg",
	)
	}
	}
	it should "select the largest main picture for the opengraph image when FacebookShareUseTrailPicFirstSwitch is OFF" in {
	FacebookShareUseTrailPicFirstSwitch.switchOff()
	goTo("/lifeandstyle/gallery/2014/nov/24/flying-dogs-in-pictures?page=off") { browser =>
	import browser._
	$("meta[property='og:image']").attributes("content").asScala.head should include(
	"e3867edb-e9d5-4be9-9c51-12258b686869-1498x2040.jpeg",
	)
	}
	}

This is not true anymore, it looks like the TestBrowser we use in our current test configuration does not automatically clear its cache after each test so the second test will always fail. We have similar result if we swap the tests.

In:

• Bump logback via PA client and Play’s SBT plugin (v2.9) #26783

we added a flag in the url to make sure the cache gets cleared and the tests run independently. This ticket is to find a way to clear the Selenium WebDriver cache programmatically.