Ensures Angular2 is stable before selenium continues. Uses fluentlenium

Angular2AbstractPage.kt

import org.fluentlenium.core.FluentPage
import org.fluentlenium.core.domain.FluentList
import org.fluentlenium.core.domain.FluentWebElement
import org.openqa.selenium.JavascriptExecutor
import org.openqa.selenium.WebDriver
import java.util.concurrent.TimeUnit

open class AbstractPage : FluentPage() {
    override fun getDriver(): WebDriver {
        val driver = super.getDriver()
        driver.manage().timeouts().setScriptTimeout(10, TimeUnit.SECONDS)
        return driver
    }

    override fun goTo(url: String?) {
        super.goTo(url)
        waitForAngular()
    }

    protected fun click(elements: FluentList<FluentWebElement>) {
        elements.click()
        waitForAngular()
    }

    protected fun waitForAngular(componentName: String = "app-root") {
        val script = """window.getAngularTestability(document.querySelector("$componentName")).whenStable(arguments[0])"""
        (driver as JavascriptExecutor).executeAsyncScript(script)
    }
}