tests/org.eclipse.swt.tests/JUnit Tests/org/eclipse/swt/tests/junit/Test_org_eclipse_swt_browser_Browser.java

/*******************************************************************************
 * Copyright (c) 2000, 2016 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.tests.junit;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import static org.junit.Assume.assumeFalse;
import static org.junit.Assume.assumeTrue;

import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicIntegerArray;
import java.util.concurrent.atomic.AtomicReference;
import java.util.concurrent.atomic.AtomicReferenceArray;
import java.util.function.Supplier;

import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.browser.Browser;
import org.eclipse.swt.browser.BrowserFunction;
import org.eclipse.swt.browser.CloseWindowListener;
import org.eclipse.swt.browser.LocationAdapter;
import org.eclipse.swt.browser.LocationEvent;
import org.eclipse.swt.browser.LocationListener;
import org.eclipse.swt.browser.OpenWindowListener;
import org.eclipse.swt.browser.ProgressAdapter;
import org.eclipse.swt.browser.ProgressEvent;
import org.eclipse.swt.browser.ProgressListener;
import org.eclipse.swt.browser.StatusTextListener;
import org.eclipse.swt.browser.TitleListener;
import org.eclipse.swt.browser.VisibilityWindowAdapter;
import org.eclipse.swt.browser.VisibilityWindowListener;
import org.eclipse.swt.browser.WindowEvent;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TestName;

/**
 * Automated Test Suite for class org.eclipse.swt.browser.Browser
 *
 * @see org.eclipse.swt.browser.Browser
 */
public class Test_org_eclipse_swt_browser_Browser extends Test_org_eclipse_swt_widgets_Composite {

	@Rule
	public TestName name = new TestName();

	Browser browser;

	boolean browser_debug = false;

	boolean isWebkit1 = false;
	boolean isWebkit2 = false;

	/**
	 * Normally, sleep in 1 ms intervals 1000 times. During browser_debug, sleep 1000 ms for 1 interval.
	 * This allows one to see the browser shell for a few seconds, which would normally not be visible during
	 * automated testing.
	 */
	int secondsToWaitTillFail, waitMS, loopMultipier;


@Override
@Before
public void setUp() {
	super.setUp();

	// Print test name if running on hudson. This makes it easier to tell in the logs which test case caused crash.
	if (SwtTestUtil.isRunningOnEclipseOrgHudsonGTK) {
		System.out.println("Running Test_org_eclipse_swt_browser_Browser#" + name.getMethodName());
	}

	secondsToWaitTillFail = 3;
	waitMS = browser_debug ? 1000 : 1;
	loopMultipier = browser_debug ? 1 : 1000;

	shell.setLayout(new FillLayout());
	browser = new Browser(shell, SWT.NONE);

	String shellTitle = name.getMethodName();
	if (SwtTestUtil.isGTK && browser.getBrowserType().equals("webkit")) {

		// Note, webkitGtk version is only available once Browser is instantiated.
		String webkitGtkVersionStr = System.getProperty("org.eclipse.swt.internal.webkitgtk.version"); //$NON-NLS-1$

		shellTitle = shellTitle + " Webkit version: " + webkitGtkVersionStr;

		String[] webkitGtkVersionStrParts = webkitGtkVersionStr.split("\\.");
		int[] webkitGtkVersionInts = new int[3];
		for (int i = 0; i < 3; i++) {
			webkitGtkVersionInts[i] = Integer.parseInt(webkitGtkVersionStrParts[i]);
		}

		// webkitgtk 2.5 and onwards uses webkit2.
		if (webkitGtkVersionInts[0] == 1 || (webkitGtkVersionInts[0] == 2 && webkitGtkVersionInts[1] <= 4)) {
			isWebkit1 = true;
		} else if (webkitGtkVersionInts[0] == 2 && webkitGtkVersionInts[1] > 4) {
			isWebkit2 = true;
		}
	}
	shell.setText(shellTitle);

	/*
	 * setWidget() is needed for Browser to occupy the whole shell.
	 * (Without setWidget(), composite and browser receive half the shell each).
	 *
	 * However, on Win32 & IE, an OleFrame() child is created in Browser, which break the first
	 * assertion in test_getChildren() ":a:: array lengths differed, expected.length=0 actual.length=1"
	 *
	 * See: Bug 499387
	 */
	if (! SwtTestUtil.isWindows) {
		setWidget(browser);
	}

}


/**
 * Test that if Browser is constructed with the parent being "null", Browser throws an exception.
 */
@Override
@Test(expected = IllegalArgumentException.class)
public void test_ConstructorLorg_eclipse_swt_widgets_CompositeI() {
	Browser browser = new Browser(shell, SWT.NONE);
	browser.dispose();
	browser = new Browser(shell, SWT.BORDER);
	// System.out.println("Test_org_eclipse_swt_browser_Browser#test_Constructor*#getBrowserType(): " + browser.getBrowserType());
	browser.dispose();
	browser = new Browser(null, SWT.NONE); // Should throw.
}

@Test
public void test_CloseWindowListener_closeShell() {
	Display display = Display.getCurrent();
	Shell shell = new Shell(display);
	Browser browser = new Browser(shell, SWT.NONE);
	browser.addCloseWindowListener(event -> {}); // shouldn't throw
	shell.close();
}

@Test(expected = IllegalArgumentException.class)
public void test_CloseWindowListener_addWithNullArg() {
	browser.addCloseWindowListener(null);
}

@Test(expected = IllegalArgumentException.class)
public void test_CloseWindowListener_removeWithNullArg() {
	browser.removeCloseWindowListener(null);
}

@Test
public void test_CloseWindowListener_addAndRemove () {
	CloseWindowListener listener = event -> {};
	for (int i = 0; i < 100; i++) browser.addCloseWindowListener(listener);
	for (int i = 0; i < 100; i++) browser.removeCloseWindowListener(listener);
}

@Test
public void test_LocationListener_adapter_closeShell() {
	Display display = Display.getCurrent();
	Shell shell = new Shell(display);
	Browser browser = new Browser(shell, SWT.NONE);
	LocationAdapter adapter = new LocationAdapter() {};
	browser.addLocationListener(adapter); // shouldn't throw
	shell.close();
}

@Test(expected = IllegalArgumentException.class)
public void test_LocationListener_addWithNullArg() {
	browser.addLocationListener(null);
}

@Test(expected = IllegalArgumentException.class)
public void test_LocationListener_removeWithNullArg() {
	browser.removeLocationListener(null);
}

@Test
public void test_LocationListener_addAndRemove() {
	LocationListener listener = new LocationListener() {
		@Override
		public void changed(LocationEvent event) {
		}
		@Override
		public void changing(LocationEvent event) {
		}
	};
	for (int i = 0; i < 100; i++) browser.addLocationListener(listener);
	for (int i = 0; i < 100; i++) browser.removeLocationListener(listener);
}

@Test
public void test_LocationListener_changing() {
	AtomicBoolean changingFired = new AtomicBoolean(false);
	browser.addLocationListener(new LocationAdapter() {
		@Override
		public void changing(LocationEvent event) {
			changingFired.set(true);
		}
	});
	shell.open();
	browser.setText("Hello world");
	boolean passed = waitForPassCondition(() -> changingFired.get());
	assertTrue("LocationListener.changing() event was never fixed", passed);
}
@Test
public void test_LocationListener_changed() {
	AtomicBoolean changedFired = new AtomicBoolean(false);
	browser.addLocationListener(new LocationAdapter() {
		@Override
		public void changed(LocationEvent event) {
			changedFired.set(true);
		}
	});
	shell.open();
	browser.setText("Hello world");
	boolean passed = waitForPassCondition(() -> changedFired.get());
	assertTrue("LocationListener.changing() event was never fixed", passed);
}
@Test
public void test_LocationListener_changingAndOnlyThenChanged() {
	// Test proper order of events.
	// Check that 'changed' is only fired after 'changing' has fired at least once.
	AtomicBoolean changingFired = new AtomicBoolean(false);
	AtomicBoolean changedFired = new AtomicBoolean(false);
	AtomicBoolean changedFiredTooEarly = new AtomicBoolean(false);
	AtomicBoolean finished = new AtomicBoolean(false);

	browser.addLocationListener(new LocationListener() {
		@Override
		public void changing(LocationEvent event) { // Multiple changing events can occur during a load.
				changingFired.set(true);
		}
		@Override
		public void changed(LocationEvent event) {
			if (!changingFired.get())
				changedFiredTooEarly.set(true);

			changedFired.set(true);
			finished.set(true);
		}
	});
	shell.open();
	browser.setText("Hello world");
	waitForPassCondition(() -> finished.get());

	if (finished.get() && changingFired.get() && changedFired.get() && !changedFiredTooEarly.get()) {
		return; // pass
	} else if (!finished.get()) {
		fail("Test timed out. 'changed()' never fired");
	} else {
		if (changedFiredTooEarly.get())
			fail("changed() was fired before changing(). Wrong signal order");
		else if (!changingFired.get())
			fail("changing() was never fired");
		else  {
			fail("LocationListener test failed. changing():" + changingFired.get()
			+ "  changed():" + changedFired.get() + " changedFiredTooEarly:" + changedFiredTooEarly.get());
		}
	}
}

@Test
public void test_OpenWindowListener_closeShell() {
	Display display = Display.getCurrent();
	Shell shell = new Shell(display);
	Browser browser = new Browser(shell, SWT.NONE);
	browser.addOpenWindowListener(event -> {});
	shell.close();
}

@Test(expected = IllegalArgumentException.class)
public void test_OpenWindowListener_addWithNulArg() {
	browser.addOpenWindowListener(null);
}

@Test(expected = IllegalArgumentException.class)
public void test_OpenWindowListener_removeWithNullArg() {
	browser.removeOpenWindowListener(null);
}

@Test
public void test_OpenWindowListener_addAndRemove() {
	OpenWindowListener listener = event -> {};
	for (int i = 0; i < 100; i++) browser.addOpenWindowListener(listener);
	for (int i = 0; i < 100; i++) browser.removeOpenWindowListener(listener);
}

@Test
public void test_ProgressListener_newProgressAdapter() {
	new ProgressAdapter() {};
}

@Test
public void test_ProgressListener_newProgressAdapter_closeShell() {
	Display display = Display.getCurrent();
	Shell shell = new Shell(display);
	Browser browser = new Browser(shell, SWT.NONE);
	browser.addProgressListener(new ProgressAdapter() {});
	shell.close();
}

@Test
public void test_ProgressListener_newListener_closeShell() {
	Display display = Display.getCurrent();
	Shell shell = new Shell(display);
	Browser browser = new Browser(shell, SWT.NONE);
	browser.addProgressListener(new ProgressListener() {
		@Override
		public void changed(ProgressEvent event) {
		}
		@Override
		public void completed(ProgressEvent event) {
		}
	});
	shell.close();
}

@Test(expected = IllegalArgumentException.class)
public void test_ProgressListener_addWithNullArg() {
	browser.addProgressListener(null);
}

@Test(expected = IllegalArgumentException.class)
public void test_ProgressListener_removeWithNullArg() {
	browser.removeProgressListener(null);
}

@Test
public void test_ProgressListener_addAndRemove() {
	ProgressListener listener = new ProgressListener() {
		@Override
		public void changed(ProgressEvent event) {
		}
		@Override
		public void completed(ProgressEvent event) {
		}
	};
	for (int i = 0; i < 100; i++) browser.addProgressListener(listener);
	for (int i = 0; i < 100; i++) browser.removeProgressListener(listener);
}

@Test(expected = IllegalArgumentException.class)
public void test_StatusTextListener_addWithNull() {
	browser.addStatusTextListener(null);
}

@Test(expected = IllegalArgumentException.class)
public void test_StatusTextListener_removeWithNullArg() {
	browser.removeStatusTextListener(null);
}

@Test
public void test_StatusTextListener_addAndRemove() {
	StatusTextListener listener = event -> {
	};
	for (int i = 0; i < 100; i++) browser.addStatusTextListener(listener);
	for (int i = 0; i < 100; i++) browser.removeStatusTextListener(listener);
}

/**
 * Test if hovering over a hyperlink triggers status Text change listener.
 * Logic:
 * 1) Create a page that has a hyper link (covering the whole page)
 * 2) Move shell to top left corner
 * 3) Upon compleation of page load, move cursor across whole shell.
 *    (Note, in current jUnit, browser sometimes only takes up half the shell).
 * 4) StatusTextListener should get triggered. Test passes.
 * 5) Else timeout & fail.
 *
 * Set variable "browser_debug" to true to see this being performed at human-observable speed.
 *
 * Note: Historically one could execute some javascript to change status bar (window.status=txt).
 * But most browsers don't support this anymore. Only hovering over a hyperlink changes status.
 *
 * StatusTextListener may be triggerd upon page load also. So this test can pass if
 * a page load sets the status text (on older browsers) or passes when the mouse hovers
 * over the hyperlink (newer Webkit2+) browser.
 */
@Test
public void test_StatusTextListener_hoverMouseOverLink() {
	AtomicBoolean statusChanged = new AtomicBoolean(false);
	int size = 500;

	// 1) Create a page that has a hyper link (covering the whole page)
	Browser browser = new Browser(shell, SWT.NONE);
	StringBuilder longhtml = new StringBuilder();
	for (int i = 0; i < 200; i++) {
		longhtml.append("text text text text text text text text text text text text text text text text text text text text text text text text<br>");
	}
	browser.setText("<a href='http://localhost'>" + longhtml + "</a>");

	// 2) Move shell to top left corner
	shell.setLocation(0, 0);
	shell.setSize(size, size);

	browser.addProgressListener(new ProgressListener() {
		@Override
		public void completed(ProgressEvent event) {
			// * 3) Upon compleation of page load, move cursor across whole shell.
			// *    (Note, in current jUnit, browser sometimes only takes up half the shell).
			Display display = event.display;
			Point cachedLocation = display.getCursorLocation();
			display.setCursorLocation(20, 10);
			browser.getBounds();
			for (int i = 0; i < size; i++) {
				display.setCursorLocation(i, i);
				runLoopTimer(browser_debug ? 3 : 0);
			}
			display.setCursorLocation(cachedLocation); // for convenience of developer. Not needed for test.

		}
		@Override
		public void changed(ProgressEvent event) {}
	});

	browser.addStatusTextListener(event -> {
		statusChanged.set(true);
	});

	shell.open();
	for (int i = 0; i < (loopMultipier * secondsToWaitTillFail); i++) {  // Wait up to seconds before declaring test as failed.
		runLoopTimer(waitMS);
		if (statusChanged.get()) {
			return; //passed.
		}
	}
	//5) Else timeout & fail.
	fail();
}

@Test
public void test_TitleListener_addListener_closeShell() {
	Display display = Display.getCurrent();
	Shell shell = new Shell(display);
	Browser browser = new Browser(shell, SWT.NONE);
	browser.addTitleListener(event -> {
	});
	shell.close();
}

@Test(expected = IllegalArgumentException.class)
public void test_TitleListener_addwithNull() {
	browser.addTitleListener(null);
}

@Test(expected = IllegalArgumentException.class)
public void test_TitleListener_removeWithNullArg() {
	browser.removeTitleListener(null);
}

@Test
public void test_TitleListener_addAndRemove() {
	TitleListener listener = event -> {};
	for (int i = 0; i < 100; i++) browser.addTitleListener(listener);
	for (int i = 0; i < 100; i++) browser.removeTitleListener(listener);
}

@Test
public void test_VisibilityWindowListener_newAdapter() {
	new VisibilityWindowAdapter() {};
}

@Test
public void test_VisibilityWindowListener_newAdapter_closeShell() {
	Display display = Display.getCurrent();
	Shell shell = new Shell(display);
	Browser browser = new Browser(shell, SWT.NONE);
	browser.addVisibilityWindowListener(new VisibilityWindowAdapter(){});
	shell.close();
}

@Test
public void test_VisibilityWindowListener_newListener_closeShell() {
	Display display = Display.getCurrent();
	Shell shell = new Shell(display);
	Browser browser = new Browser(shell, SWT.NONE);
	browser.addVisibilityWindowListener(new VisibilityWindowListener() {
		@Override
		public void hide(WindowEvent event) {
		}
		@Override
		public void show(WindowEvent event) {
		}
	});
	shell.close();
}

@Test(expected = IllegalArgumentException.class)
public void test_VisibilityWindowListener_addWithNull() {
	browser.addVisibilityWindowListener(null);
}

@Test(expected = IllegalArgumentException.class)
public void test_VisibilityWindowListener_removeWithNullArg() {
	browser.removeVisibilityWindowListener(null);
}

@Test
public void test_VisibilityWindowListener_addAndRemove() {
	VisibilityWindowListener listener = new VisibilityWindowListener() {
		@Override
		public void hide(WindowEvent event) {
		}
		@Override
		public void show(WindowEvent event) {
		}
	};
	for (int i = 0; i < 100; i++) browser.addVisibilityWindowListener(listener);
	for (int i = 0; i < 100; i++) browser.removeVisibilityWindowListener(listener);
}

@Override
@Test
public void test_isVisible() {
	// Note. This test sometimes crashes with webkit1 because shell.setVisible() calls g_main_context_iteration(). See Bug 509411
	// To reproduce, try running test suite 20 times in a loop.
	super.test_isVisible();
}

/**
 * Test that going back in history, when no new pages were visited, returns false.
 */
@Test
public void test_back() {
	for (int i = 0; i < 2; i++) {
		browser.back();
	}
	/* returning 10 times in history - expecting false is returned */
	boolean result = browser.back();
	assertFalse(result);
}

@Test(expected = IllegalArgumentException.class)
public void test_setTextNull() {
	browser.setText(null);
}

@Test(expected = IllegalArgumentException.class)
public void test_setUrlWithNullArg() {
	browser.setUrl(null);
}


/**
 * Test that going forward in history (without having gone back before) returns false.
 */
@Test
public void test_forward() {
	for (int i = 0; i < 2; i++) {
		browser.forward();
	}
	/* going forward 10 times in history - expecting false is returned */
	boolean result = browser.forward();
	assertFalse(result);
}

/**
 * Test that getUrl() returns a non-null string.
 */
@Test
public void test_getUrl() {
	String string = browser.getUrl();
	assertTrue(string != null);
}


/**
 * Test of 'back in history' api.
 * - Test isBackEnabled() and back() return the same value.
 * - Test that going isBackEnabled still returns false if back was called multiple times.
 */
@Test
public void test_isBackEnabled() {

	/* back should return the same value that isBackEnabled previously returned */
	assertEquals(browser.isBackEnabled(), browser.back());

	for (int i = 0; i < 2; i++) {
		browser.back();
	}
	/* going back 10 times in history - expecting false is returned */
	boolean result = browser.isBackEnabled();
	assertFalse(result);
}

/**
 * Test of 'forward in history' api.
 * - Test isForwardEnabled() and forward() return the same value.
 * - Test that going isBackEnabled still returns false if back was called multiple times.
 */
@Test
public void test_isForwardEnabled() {
	/* forward should return the same value that isForwardEnabled previously returned */
	assertEquals(browser.isForwardEnabled(), browser.forward());

	for (int i = 0; i < 10; i++) {
		browser.forward();
	}
	/* going forward 10 times in history - expecting false is returned */
	boolean result = browser.isForwardEnabled();
	assertFalse(result);
}

/**
 * Test that refresh executes without throwing exceptions.
 * (Maybe we should actually load a page first?)
 */
@Test
public void test_refresh() {
	for (int i = 0; i < 2; i++) {
		browser.refresh();
	}
}



/**
 * Test that HTML can be loaded into the browser.
 * Assertion is based on the return value of setText().
 * (A true return value doesn't neccessarily mean the text is actually rendered,
 * You should see a browser page with 'That is a test line...' printed many times.)
 */
@Test
public void test_setTextLjava_lang_String() {
	// Note, this test sometimes crashes on webkit1. See Bug 509411

	String html = "<HTML><HEAD><TITLE>HTML example 2</TITLE></HEAD><BODY><H1>HTML example 2</H1>";
	for (int i = 0; i < 1000; i++) {
		html +="<P>That is a test line with the number "+i+"</P>";
	}
	html += "</BODY></HTML>";
	boolean result = browser.setText(html);
	assertTrue(result);
	runLoopTimer(2000);
}

/**
 * Test that setUrl() finishes without throwing an error.
 */
@Test
public void test_setUrl() {
	// Note, this test sometimes crashes on webkit1. See Bug 509411

	/* THIS TEST REQUIRES WEB ACCESS! How else can we really test the http:// part of a browser widget? */
	assert(browser.setUrl("http://www.eclipse.org/swt"));
	runLoopTimer(2000);
	// TODO - it would be good to verify that the page actually loaded. ex download the webpage etc..
}


/**
 * Test that a page load an be stopped (stop()) without throwing an exception.
 */
@Test
public void test_stop() {
	/* THIS TEST REQUIRES WEB ACCESS! How else can we really test the http:// part of a browser widget? */
	browser.setUrl("http://www.eclipse.org/swt");
	runLoopTimer(1000);
	browser.stop();
}

@Test(expected = IllegalArgumentException.class)
public void test_execute_withNullArg() {
	browser.execute(null);
}

/**
 * Test execute and windowCloseListener.
 * Close listener used to tell if execute actually worked in some meaningful way.
 */
@Test
public void test_execute_and_closeListener () {
	String skipMsg = "This test is unstable on Cocoa/Win32 at present. Skipping test on non webkit2 for now. To be fixed in Bug 511874";
	assumeTrue(skipMsg, isWebkit1 || isWebkit2);
	// See: https://bugs.eclipse.org/bugs/show_bug.cgi?id=511874

	AtomicBoolean hasClosed = new AtomicBoolean(false);

	browser.setText("You should not see this page, it should have been closed by javascript");
	browser.addCloseWindowListener(e -> {
		hasClosed.set(true);
	});

	browser.execute("window.close()");

	shell.open();
	for (int i = 0; i < (loopMultipier * secondsToWaitTillFail); i++) {  // Wait up to seconds before declaring test as failed.
		runLoopTimer(waitMS);
		if (hasClosed.get()) {
			disposedIntentionally = true;
			return; // passed.
		}
	}
	fail("Either browser.execute() did not work (if you still see the html page) or closeListener Was not triggered if "
			+ "browser looks disposed, but test still fails.");
}


/**
 * Test the evaluate() api that returns a String type. Functionality based on Snippet308.
 * Only wait till success. Otherwise timeout after 3 seconds.
 */
@Test
public void test_evaluate_string() {
	// Run locally, skip on hudson. see Bug 509411
	// This test sometimes crashes on webkit1, but it's useful to test at least one 'evaluate' situation.
	assumeFalse(webkit1SkipMsg(), (SwtTestUtil.isRunningOnEclipseOrgHudsonGTK && isWebkit1));

	final AtomicReference<String> returnValue = new AtomicReference<>();
	browser.addProgressListener(new ProgressListener() {
		@Override
		public void changed(ProgressEvent event) {
		}
		@Override
		public void completed(ProgressEvent event) {
			String evalResult = (String) browser.evaluate("return document.getElementById('myid').childNodes[0].nodeValue;");
			returnValue.set(evalResult);
			if (browser_debug)
				System.out.println("Node value: "+ evalResult);
		}
	});

	browser.setText("<html><body><p id='myid'>HelloWorld</p></body></html>");
	shell.open();
	for (int i = 0; i < (loopMultipier * secondsToWaitTillFail); i++) {  // Wait up to seconds before declaring test as failed.
		runLoopTimer(waitMS);
		if ("HelloWorld".equals(returnValue.get())) {
			return; // passed.
		}
	}
	fail("Evaluation did not return a value. Or test timed out.");
}

/**
 * Test the evaluate() api that returns a number (Double). Functionality based on Snippet308.
 * Only wait till success. Otherwise timeout after 3 seconds.
 */
@Test
public void test_evaluate_number_normal() {
	assumeFalse(webkit1SkipMsg(), isWebkit1); // Bug 509411
	Double testNum = 123.0;
	boolean passed = evaluate_number_helper(testNum);
	assertTrue("Failed to evaluate number: " + testNum.toString(), passed);
}

/**
 * Test the evaluate() api that returns a number (Double). Functionality based on Snippet308.
 * Only wait till success. Otherwise timeout after 3 seconds.
 */
@Test
public void test_evaluate_number_negative() {
	assumeFalse(webkit1SkipMsg(), isWebkit1); // Bug 509411

	Double testNum = -123.0;
	boolean passed = evaluate_number_helper(testNum);
	assertTrue("Failed to evaluate number: " + testNum.toString(), passed);
}

/**
 * Test the evaluate() api that returns a number (Double). Functionality based on Snippet308.
 * Only wait till success. Otherwise timeout after 3 seconds.
 */
@Test
public void test_evaluate_number_big() {
	assumeFalse(webkit1SkipMsg(), isWebkit1); // Bug 509411

	Double testNum = 10000000000.0;
	boolean passed = evaluate_number_helper(testNum);
	assertTrue("Failed to evaluate number: " + testNum.toString(), passed);
}

boolean evaluate_number_helper(Double testNum) {
	final AtomicReference<Double> returnValue = new AtomicReference<>();
	browser.addProgressListener(new ProgressListener() {
		@Override
		public void changed(ProgressEvent event) {
		}
		@Override
		public void completed(ProgressEvent event) {
			Double evalResult = (Double) browser.evaluate("return " +testNum.toString());
			returnValue.set(evalResult);
			if (browser_debug)
				System.out.println("Node value: "+ evalResult);
		}
	});

	browser.setText("<html><body>HelloWorld</body></html>");
	shell.open();
	boolean passed = false;
	for (int i = 0; i < (loopMultipier * secondsToWaitTillFail); i++) {  // Wait up to seconds before declaring test as failed.
		runLoopTimer(waitMS);
		if (testNum.equals(returnValue.get())) {
			passed = true;
			break;
		}
	}
	return passed;
}

/**
 * Test the evaluate() api that returns a boolean. Functionality based on Snippet308.
 * Only wait till success. Otherwise timeout after 3 seconds.
 */
@Test
public void test_evaluate_boolean() {
	assumeFalse(webkit1SkipMsg(), isWebkit1); // Bug 509411
	final AtomicBoolean atomicBoolean = new AtomicBoolean(false);
	browser.addProgressListener(new ProgressListener() {
		@Override
		public void changed(ProgressEvent event) {
		}
		@Override
		public void completed(ProgressEvent event) {
			Boolean evalResult = (Boolean) browser.evaluate("return true");
			atomicBoolean.set(evalResult);
			if (browser_debug)
				System.out.println("Node value: "+ evalResult);
		}
	});

	browser.setText("<html><body>HelloWorld</body></html>");
	shell.open();
	for (int i = 0; i < (loopMultipier * secondsToWaitTillFail); i++) {  // Wait up to seconds before declaring test as failed.
		runLoopTimer(waitMS);
		if (atomicBoolean.get()) {
			return; // passed.
		}
	}
	fail("Evaluation did not return a boolean. Or test timed out.");
}

/**
 * Test the evaluate() api that returns null. Functionality based on Snippet308.
 * Only wait till success. Otherwise timeout after 3 seconds.
 */
@Test
public void test_evaluate_null() {
	assumeFalse(webkit1SkipMsg(), isWebkit1); // Bug 509411
	 // Boolen only used as dummy placeholder so the object is not null.
	final AtomicReference<Object> returnValue = new AtomicReference<>(new Boolean(true));
	browser.addProgressListener(new ProgressListener() {
		@Override
		public void changed(ProgressEvent event) {
		}
		@Override
		public void completed(ProgressEvent event) {
			Object evalResult = browser.evaluate("return null");
			returnValue.set(evalResult);
			if (browser_debug)
				System.out.println("Node value: "+ evalResult);
		}
	});

	browser.setText("<html><body>HelloWorld</body></html>");
	shell.open();
	for (int i = 0; i < (loopMultipier * secondsToWaitTillFail); i++) {  // Wait up to seconds before declaring test as failed.
		runLoopTimer(waitMS);
		if (returnValue.get() == null) {
			return; // passed
		}
	}
	fail("Evaluate did not return a null. Timed out.");
}

/**
 * Test the evaluate() api that throws the invalid return value exception. Functionality based on Snippet308.
 * Only wait till success. Otherwise timeout after 3 seconds.
 */
@Test
public void test_evaluate_invalid_return_value() {
	assumeFalse(webkit1SkipMsg(), isWebkit1); // Bug 509411

	if (SwtTestUtil.isWindows) {
		/* Bug 508210 . Inconsistent beahiour on windows at the moment.
		 * Fixing requires deeper investigation. Disabling newly added test for now.
		 */
		return;
	}

	final AtomicInteger exception = new AtomicInteger(-1);
	browser.addProgressListener(new ProgressListener() {
		@Override
		public void changed(ProgressEvent event) {}
		@Override
		public void completed(ProgressEvent event) {
			try {
			browser.evaluate("return new Date()"); //Date is not supoprted as return value.
			} catch (SWTException e) {
				exception.set(e.code);
			}
		}
	});

	browser.setText("<html><body>HelloWorld</body></html>");
	shell.open();
	for (int i = 0; i < (loopMultipier * secondsToWaitTillFail); i++) {  // Wait up to seconds before declaring test as failed.
		runLoopTimer(waitMS);
		if (exception.get() != -1) {
			if (exception.get() == SWT.ERROR_INVALID_RETURN_VALUE) {
				return; // passed.
			} else if (exception.get() == SWT.ERROR_FAILED_EVALUATE) {
				System.err.println("SWT Warning: test_evaluate_invalid_return_value threw wrong exception code."
						+ " Expected ERROR_INVALID_RETURN_VALUE but got ERROR_FAILED_EVALUATE");
				return; // passed.
				// Webkit1 is known to throw the wrong exception.
			} else  {
				fail("Invalid exception code : " + exception.get());
			}
			break;
		}
	}
	fail("This test tests for evaluation to return an invalid return value. An exception should have been thrown, but none was thrown. Or test timed out");
}

/**
 * Test the evaluate() api that throws the evaluation failed exception. Functionality based on Snippet308.
 * Only wait till success. Otherwise timeout after 3 seconds.
 */
@Test
public void test_evaluate_evaluation_failed_exception() {
	assumeFalse(webkit1SkipMsg(), isWebkit1); // Bug 509411
	final AtomicInteger exception = new AtomicInteger(-1);
	browser.addProgressListener(new ProgressListener() {
		@Override
		public void changed(ProgressEvent event) {}
		@Override
		public void completed(ProgressEvent event) {
			try {
			browser.evaluate("return runSomeUndefinedFunctionInJavaScriptWhichCausesUndefinedError()");
			} catch (SWTException e) {
				exception.set(e.code);
			}
		}
	});

	browser.setText("<html><body>HelloWorld</body></html>");
	shell.open();
	for (int i = 0; i < (loopMultipier * secondsToWaitTillFail); i++) {  // Wait up to seconds before declaring test as failed.
		runLoopTimer(waitMS);
		if (exception.get() != -1) {
			if (exception.get() == SWT.ERROR_FAILED_EVALUATE) {
				return; // passed
			} else  {
				fail("Invalid exception thrown: " + exception.get());
			}
			break;
		}
	}
	fail("Expected exception to be thrown, but none was thrown. Test timed out.");
}

/**
 * Test the evaluate() api that returns an array of numbers. Functionality based on Snippet308.
 * Only wait till success. Otherwise timeout after 3 seconds.
 */
@Test
public void test_evaluate_array_numbers() {
	assumeFalse(webkit1SkipMsg(), isWebkit1); // Bug 509411

	// Small note:
	// evaluate() returns 'Double' type. Java doesn't have AtomicDouble
	// for convienience we simply convert double to int as we're dealing with integers anyway.
	final AtomicIntegerArray atomicIntArray = new AtomicIntegerArray(3);
	atomicIntArray.set(0, -1);
	browser.addProgressListener(new ProgressListener() {
		@Override
		public void changed(ProgressEvent event) {
		}
		@Override
		public void completed(ProgressEvent event) {
			Object[] evalResult = (Object[]) browser.evaluate("return new Array(1,2,3)");
			atomicIntArray.set(0, ((Double) evalResult[0]).intValue());
			atomicIntArray.set(1, ((Double) evalResult[1]).intValue());
			atomicIntArray.set(2, ((Double) evalResult[2]).intValue());
			if (browser_debug)
				System.out.println("Node value: "+ evalResult);
		}
	});

	browser.setText("<html><body><p id='myid'>HelloWorld</p></body></html>");
	shell.open();
	for (int i = 0; i < (loopMultipier * secondsToWaitTillFail); i++) {  // Wait up to seconds before declaring test as failed.
		runLoopTimer(waitMS);
		if (atomicIntArray.get(0) != -1) {
			if (atomicIntArray.get(0) == 1 && atomicIntArray.get(1) == 2 && atomicIntArray.get(2) == 3) {
				return; // passed
			} else {
				fail("Resulting numbers in the array are not as expected");
			}
		}
	}
	fail("Evaluation should have returned an array, but array not returned or values are not correct.");
}

/**
 * Test the evaluate() api that returns an array of strings. Functionality based on Snippet308.
 * Only wait till success. Otherwise timeout after 3 seconds.
 */
@Test
public void test_evaluate_array_strings () {
	assumeFalse(webkit1SkipMsg(), isWebkit1); // Bug 509411

	final AtomicReferenceArray<String> atomicStringArray = new AtomicReferenceArray<>(3);
	atomicStringArray.set(0, "executing");
	browser.addProgressListener(new ProgressListener() {
		@Override
		public void changed(ProgressEvent event) {
		}
		@Override
		public void completed(ProgressEvent event) {
			Object[] evalResult = (Object[]) browser.evaluate("return new Array(\"str1\", \"str2\", \"str3\")");
			atomicStringArray.set(0, (String) evalResult[0]);
			atomicStringArray.set(1, (String) evalResult[1]);
			atomicStringArray.set(2, (String) evalResult[2]);
			if (browser_debug)
				System.out.println("Node value: "+ evalResult);
		}
	});

	browser.setText("<html><body><p id='myid'>HelloWorld</p></body></html>");
	shell.open();
	for (int i = 0; i < (loopMultipier * secondsToWaitTillFail); i++) {  // Wait up to seconds before declaring test as failed.
		runLoopTimer(waitMS);
		if (! "executing".equals(atomicStringArray.get(0))) {
			if (atomicStringArray.get(0).equals("str1")
					&& atomicStringArray.get(1).equals("str2")
					&& atomicStringArray.get(2).equals("str3")) {
				return; // passed
			} else {
				fail("Resulting strings in array are not as expected");
			}
		}
	}
	fail("Expected an array of strings, but did not receive array or got the wrong result.");
}

/**
 * Test the evaluate() api that returns an array of mixed types. Functionality based on Snippet308.
 * Only wait till success. Otherwise timeout after 3 seconds.
 */
@Test
public void test_evaluate_array_mixedTypes () {
	assumeFalse(webkit1SkipMsg(), isWebkit1); // Bug 509411
	final AtomicReferenceArray<Object> atomicArray = new AtomicReferenceArray<>(3);
	atomicArray.set(0, "executing");
	browser.addProgressListener(new ProgressListener() {
		@Override
		public void changed(ProgressEvent event) {
		}
		@Override
		public void completed(ProgressEvent event) {
			Object[] evalResult = (Object[]) browser.evaluate("return new Array(\"str1\", 2, true)");
			atomicArray.set(2, evalResult[2]);
			atomicArray.set(1, evalResult[1]);
			atomicArray.set(0, evalResult[0]); // should be set last. to avoid loop below ending & failing to early.
			if (browser_debug)
				System.out.println("Node value: "+ evalResult);
		}
	});


	browser.setText("<html><body><p id='myid'>HelloWorld</p></body></html>");
	shell.open();
	for (int i = 0; i < (loopMultipier * secondsToWaitTillFail); i++) {  // Wait up to seconds before declaring test as failed.
		runLoopTimer(waitMS);
		if (! "executing".equals(atomicArray.get(0))) {
			if (atomicArray.get(0).equals("str1")
					&& ((Double) atomicArray.get(1)) == 2
					&& ((Boolean) atomicArray.get(2))) {
				return; //passed.
			} else {
				fail("Resulting strings not as expected");
			}
		}
	}
	fail("Expected evaluate to return an array of mixed types. But didn't receive a return value or return values didn't match.");
}


ProgressListener callCustomFunctionUponLoad = new ProgressListener() {
	@Override
	public void changed(ProgressEvent event) {}
	@Override
	public void completed(ProgressEvent event) {
		browser.execute("callCustomFunction()");
	}
};

/**
 * Test that javascript can call java.
 * loosely based on Snippet307.
 */
@Test
public void test_BrowserFunction_callback () {
	// On webkit1, this test works if ran on it's own. But sometimes in test-suite with other tests it causes jvm crash.
	// culprit seems to be the main_context_iteration() call in shell.setVisible().
	// See Bug 509587.  Solution: Webkit2.
	assumeFalse(webkit1SkipMsg(), isWebkit1);

	AtomicBoolean javaCallbackExecuted = new AtomicBoolean(false);

	class JavascriptCallback extends BrowserFunction { // Note: Local class defined inside method.
		JavascriptCallback(Browser browser, String name) {
			super(browser, name);
		}

		@Override
		public Object function(Object[] arguments) {
			javaCallbackExecuted.set(true);
			return null;
		}
	}

	String htmlWithScript = "<html><head>\n"
			+ "<script language=\"JavaScript\">\n"
			+ "function callCustomFunction() {\n"  // Define a javascript function.
			+ "     document.body.style.backgroundColor = 'red'\n"
			+ "		jsCallbackToJava()\n"        // This calls the javafunction that we registered.
			+ "}"
			+ "</script>\n"
			+ "</head>\n"
			+ "<body> I'm going to make a callback to java </body>\n"
			+ "</html>\n";

	browser.setText(htmlWithScript);
	new JavascriptCallback(browser, "jsCallbackToJava");

	browser.addProgressListener(callCustomFunctionUponLoad);

	shell.open();
	for (int i = 0; i < (loopMultipier * secondsToWaitTillFail); i++) {  // Wait up to seconds before declaring test as failed.
		runLoopTimer(waitMS);
		if (javaCallbackExecuted.get()) {
			return; // pass.
		}
	}
	fail();
}

/**
 * Test that javascript can call java and pass an integer to java.
 * loosely based on Snippet307.
 */
@Test
public void test_BrowserFunction_callback_with_integer () {
	// On webkit1, this test works if ran on it's own. But sometimes in test-suite with other tests it causes jvm crash.
	// culprit seems to be the main_context_iteration() call in shell.setVisible().
	// See Bug 509587.  Solution: Webkit2.
	// It's useful to run at least one function test on webkit1 locally.
	assumeFalse(webkit1SkipMsg(), (SwtTestUtil.isRunningOnEclipseOrgHudsonGTK && isWebkit1)); // run locally. Skip on hudson that runs webkit1.

	AtomicInteger returnInt = new AtomicInteger(0);

	class JavascriptCallback extends BrowserFunction { // Note: Local class defined inside method.
		JavascriptCallback(Browser browser, String name) {
			super(browser, name);
		}

		@Override
		public Object function(Object[] arguments) {
			Double returnedDouble = (Double) arguments[0];
			returnInt.set(returnedDouble.intValue()); // 5.0 -> 5
			return null;
		}
	}

	String htmlWithScript = "<html><head>\n"
			+ "<script language=\"JavaScript\">\n"
			+ "function callCustomFunction() {\n"  // Define a javascript function.
			+ "     document.body.style.backgroundColor = 'red'\n"
			+ "		jsCallbackToJava(5)\n"        // This calls the javafunction that we registered ** with value of 5.
			+ "}"
			+ "</script>\n"
			+ "</head>\n"
			+ "<body> I'm going to make a callback to java </body>\n"
			+ "</html>\n";

	browser.setText(htmlWithScript);
	new JavascriptCallback(browser, "jsCallbackToJava");

	browser.addProgressListener(callCustomFunctionUponLoad);

	shell.open();
	for (int i = 0; i < (loopMultipier * secondsToWaitTillFail); i++) {  // Wait up to seconds before declaring test as failed.
		runLoopTimer(waitMS);
		if (returnInt.get() == 5) {
			return; // pass.
		}
	}
	fail();
}



/**
 * Test that javascript can call java and pass a Boolean to java.
 * loosely based on Snippet307.
 */
@Test
public void test_BrowserFunction_callback_with_boolean () {
	// On webkit1, this test works if ran on it's own. But sometimes in test-suite with other tests it causes jvm crash.
	// culprit seems to be the main_context_iteration() call in shell.setVisible().
	// See Bug 509587.  Solution: Webkit2.
	assumeFalse(webkit1SkipMsg(), isWebkit1);

	AtomicBoolean javaCallbackExecuted = new AtomicBoolean(false);

	class JavascriptCallback extends BrowserFunction { // Note: Local class defined inside method.
		JavascriptCallback(Browser browser, String name) {
			super(browser, name);
		}

		@Override
		public Object function(Object[] arguments) {
			Boolean returnBool = (Boolean) arguments[0];
 			javaCallbackExecuted.set(returnBool);
			return null;
		}
	}

	String htmlWithScript = "<html><head>\n"
			+ "<script language=\"JavaScript\">\n"
			+ "function callCustomFunction() {\n"  // Define a javascript function.
			+ "     document.body.style.backgroundColor = 'red'\n"
			+ "		jsCallbackToJava(true)\n"        // This calls the javafunction that we registered.
			+ "}"
			+ "</script>\n"
			+ "</head>\n"
			+ "<body> I'm going to make a callback to java </body>\n"
			+ "</html>\n";

	browser.setText(htmlWithScript);
	new JavascriptCallback(browser, "jsCallbackToJava");

	browser.addProgressListener(callCustomFunctionUponLoad);

	shell.open();
	for (int i = 0; i < (loopMultipier * secondsToWaitTillFail); i++) {  // Wait up to seconds before declaring test as failed.
		runLoopTimer(waitMS);
		if (javaCallbackExecuted.get()) {
			return; // pass.
		}
	}
	fail();
}


/**
 * Test that javascript can call java and pass a String to java.
 * loosely based on Snippet307.
 */
@Test
public void test_BrowserFunction_callback_with_String () {
	// On webkit1, this test works if ran on it's own. But sometimes in test-suite with other tests it causes jvm crash.
	// culprit seems to be the main_context_iteration() call in shell.setVisible().
	// See Bug 509587.  Solution: Webkit2.
	assumeFalse(webkit1SkipMsg(), isWebkit1);

	final AtomicReference<String> returnValue = new AtomicReference<>();
	class JavascriptCallback extends BrowserFunction { // Note: Local class defined inside method.
		JavascriptCallback(Browser browser, String name) {
			super(browser, name);
		}

		@Override
		public Object function(Object[] arguments) {
			String returnString = (String) arguments[0];
			returnValue.set(returnString);
			return null;
		}
	}

	String htmlWithScript = "<html><head>\n"
			+ "<script language=\"JavaScript\">\n"
			+ "function callCustomFunction() {\n"  // Define a javascript function.
			+ "     document.body.style.backgroundColor = 'red'\n"
			+ "		jsCallbackToJava('hellojava')\n"        // This calls the javafunction that we registered.
			+ "}"
			+ "</script>\n"
			+ "</head>\n"
			+ "<body> I'm going to make a callback to java </body>\n"
			+ "</html>\n";

	browser.setText(htmlWithScript);
	new JavascriptCallback(browser, "jsCallbackToJava");

	browser.addProgressListener(callCustomFunctionUponLoad);

	shell.open();
	for (int i = 0; i < (loopMultipier * secondsToWaitTillFail); i++) {  // Wait up to seconds before declaring test as failed.
		runLoopTimer(waitMS);
		if ("hellojava".equals(returnValue.get())) {
			return; // pass.
		}
	}
	fail();
}


/**
 * Test that javascript can call java and pass multiple values to java.
 * loosely based on Snippet307.
 */
@Test
public void test_BrowserFunction_callback_with_multipleValues () {
	// On webkit1, this test works if ran on it's own. But sometimes in test-suite with other tests it causes jvm crash.
	// culprit seems to be the main_context_iteration() call in shell.setVisible().
	// See Bug 509587.  Solution: Webkit2.
	assumeFalse(webkit1SkipMsg(), isWebkit1);

	final AtomicReferenceArray<Object> atomicArray = new AtomicReferenceArray<>(3); // Strin, Double, Boolean
	atomicArray.set(0, "executing");

	class JavascriptCallback extends BrowserFunction { // Note: Local class defined inside method.
		JavascriptCallback(Browser browser, String name) {
			super(browser, name);
		}

		@Override
		public Object function(Object[] arguments) {
			atomicArray.set(1, arguments[1]);
			atomicArray.set(2, arguments[2]);
			atomicArray.set(0, arguments[0]); // item at index 0 should be set last for this test case.
			return null;
		}
	}

	String htmlWithScript = "<html><head>\n"
			+ "<script language=\"JavaScript\">\n"
			+ "function callCustomFunction() {\n"  // Define a javascript function.
			+ "     document.body.style.backgroundColor = 'red'\n"
			+ "		jsCallbackToJava('hellojava', 5, true)\n"        // This calls the javafunction that we registered.
			+ "}"
			+ "</script>\n"
			+ "</head>\n"
			+ "<body> I'm going to make a callback to java </body>\n"
			+ "</html>\n";

	browser.setText(htmlWithScript);
	new JavascriptCallback(browser, "jsCallbackToJava");

	browser.addProgressListener(callCustomFunctionUponLoad);

	shell.open();
	for (int i = 0; i < (loopMultipier * secondsToWaitTillFail); i++) {  // Wait up to seconds before declaring test as failed.
		runLoopTimer(waitMS);
		if ("executing".equals(atomicArray.get(0))) {
			continue;
		} else {
			if (atomicArray.get(0).equals("hellojava")
					&& ((Double) atomicArray.get(1)) == 5
					&& ((Boolean) atomicArray.get(2))) {
				return; //passed.
			}
		}
	}
	fail();
}


/**
 * Test that javascript can call java, java returns an Integer back to javascript.
 *
 * It's a bit tricky to tell if javascript actually received the correct value from java.
 * Solution: make a second function/callback that is called with the value that javascript received from java.
 *
 * Logic:
 *  1) Java registers function callCustomFunction() by setting html body.
 *  2) which in turn calls JavascriptCallback, which returns value 42 back to javascript.
 *  3) javascript then calls JavascriptCallback_javascriptReceivedJavaInt() and passes it value received from java.
 *  4) Java validates that the correct value (42) was passed to javascript and was passed back to java.
 *
 * loosely based on Snippet307.
 */
@Test
public void test_BrowserFunction_callback_with_javaReturningInt () {
	// On webkit1, this test works if ran on it's own. But sometimes in test-suite with other tests it causes jvm crash.
	// culprit seems to be the main_context_iteration() call in shell.setVisible().
	// See Bug 509587.  Solution: Webkit2.
	assumeFalse(webkit1SkipMsg(), isWebkit1);

	// Skip till Bug 510905 is implemented.
	assumeFalse("Skipping test_BrowserFunction_callback_with_javaReturningInt. Java's callback to Javascript doesn't support return yet", isWebkit2);

	AtomicInteger returnInt = new AtomicInteger(0);

	class JavascriptCallback extends BrowserFunction { // Note: Local class defined inside method.
		JavascriptCallback(Browser browser, String name) {
			super(browser, name);
		}

		@Override
		public Object function(Object[] arguments) {
			return 42;
		}
	}

	class JavascriptCallback_javascriptReceivedJavaInt extends BrowserFunction { // Note: Local class defined inside method.
		JavascriptCallback_javascriptReceivedJavaInt(Browser browser, String name) {
			super(browser, name);
		}

		@Override
		public Object function(Object[] arguments) {
			Double returnVal = (Double) arguments[0];
			returnInt.set(returnVal.intValue());  // 4)
			return null;
		}
	}

	String htmlWithScript = "<html><head>\n"
			+ "<script language=\"JavaScript\">\n"
			+ "function callCustomFunction() {\n"  // Define a javascript function.
			+ "     document.body.style.backgroundColor = 'red'\n"
			+ "     var retVal = jsCallbackToJava()\n"  // 2)
			+ "		document.write(retVal)\n"        // This calls the javafunction that we registered. Set HTML body to return value.
			+ "     jsSuccess(retVal)\n"				// 3)
			+ "}"
			+ "</script>\n"
			+ "</head>\n"
			+ "<body> If you see this, javascript did not receive anything from Java. This page should just be '42' </body>\n"
			+ "</html>\n";
	// 1)
	browser.setText(htmlWithScript);
	new JavascriptCallback(browser, "jsCallbackToJava");
	new JavascriptCallback_javascriptReceivedJavaInt(browser, "jsSuccess");

	browser.addProgressListener(callCustomFunctionUponLoad);

	shell.open();
	for (int i = 0; i < (loopMultipier * secondsToWaitTillFail); i++) {  // Wait up to seconds before declaring test as failed.
		runLoopTimer(waitMS);
		if (returnInt.get() == 42) { //4)
			return; // pass.
		}
	}
	fail();
}


/**
 * Test that a callback works even after a new page is loaded.
 * I.e, BrowserFunctions should have to be re-initialized after a page load.
 *
 * Logic:
 * - load a page.
 * - Register java callback.
 * - call java callback from javascript. (exec)
 *
 * - java callback instantiates new page load.
 * - new page load triggers 'completed' listener
 * - completed listener calls the registered function again.
 *
 * - once regiseterd function is called a 2nd time, it sets the test to pass.
 */
@Test
public void test_BrowserFunction_callback_afterPageReload() {
	// On webkit1, this test works if ran on it's own. But sometimes in test-suite with other tests it causes jvm crash.
	// culprit seems to be the main_context_iteration() call in shell.setVisible().
	// See Bug 509587.  Solution: Webkit2.
	assumeFalse(webkit1SkipMsg(), isWebkit1);

	AtomicBoolean javaCallbackExecuted = new AtomicBoolean(false);
	AtomicInteger callCount = new AtomicInteger(0);

	class JavascriptCallback extends BrowserFunction { // Note: Local class defined inside method.
		JavascriptCallback(Browser browser, String name) {
			super(browser, name);
		}

		@Override
		public Object function(Object[] arguments) {
			if (callCount.get() == 0) {
				callCount.set(1);
				browser.setText("2nd page load");
			} else {
				javaCallbackExecuted.set(true);
			}
			return null;
		}
	}
	browser.setText("1st (initial) page load");
	new JavascriptCallback(browser, "jsCallbackToJava");
	browser.execute("jsCallbackToJava()");

	browser.addProgressListener(new ProgressListener() {
		@Override
		public void completed(ProgressEvent event) {
			// see if function still works after a page change:
			browser.execute("jsCallbackToJava()");
		}
		@Override
		public void changed(ProgressEvent event) {}
	});

	shell.open();
	for (int i = 0; i < (loopMultipier * secondsToWaitTillFail); i++) {  // Wait up to seconds before declaring test as failed.
		runLoopTimer(waitMS);
		if (javaCallbackExecuted.get()) {
			return; // pass.
		}
	}
	fail();
}


/* custom */
/**
 * Wait for passTest to return true. Timeout otherwise.
 * @param passTest a Supplier lambda that returns true if pass condition is true. False otherwise.
 * @return true if test passes, false on timeout.
 */
private boolean waitForPassCondition(Supplier<Boolean> passTest) {
	for (int i = 0; i < (loopMultipier * secondsToWaitTillFail); i++) {  // Wait up to seconds before declaring test as failed.
		runLoopTimer(waitMS);
		if (passTest.get()) {
			return true;
		}
	}
	return false;
}

void runLoopTimer(final int milliseconds) {
	final boolean[] exit = {false};
	new Thread() {
		@Override
		public void run() {
			try {Thread.sleep(milliseconds);} catch (Exception e) {}
			exit[0] = true;
			/* wake up the event loop */
			Display display = Display.getDefault();
			if (!display.isDisposed()) {
				display.asyncExec(() -> {
					if (!shell.isDisposed()) shell.redraw();
				});
			}
		}
	}.start();
	shell.open();
	Display display = Display.getCurrent();
	while (!exit[0] && !shell.isDisposed()) if (!display.readAndDispatch()) display.sleep();
}

private String webkit1SkipMsg() {
	return "Test_org_eclipse_swt_browser. Bug 509411. Skipping test on Webkit1 due to sporadic crash: "+ name.getMethodName();
}

}