android_webview/javatests/src/org/chromium/android_webview/test/util/JSUtils.java

// Copyright 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

package org.chromium.android_webview.test.util;

import android.test.InstrumentationTestCase;

import junit.framework.Assert;

import static org.chromium.base.test.util.ScalableTimeout.scaleTimeout;

import org.chromium.android_webview.AwContents;
import org.chromium.content.browser.test.util.Criteria;
import org.chromium.content.browser.test.util.CriteriaHelper;
import org.chromium.content.browser.test.util.TestCallbackHelperContainer.OnEvaluateJavaScriptResultHelper;

/**
 * Collection of functions for JavaScript-based interactions with a page.
 */
public class JSUtils {
    private static final long WAIT_TIMEOUT_MS = scaleTimeout(2000);
    private static final int CHECK_INTERVAL = 100;

    public static void clickOnLinkUsingJs(
            final InstrumentationTestCase testCase,
            final AwContents awContents,
            final OnEvaluateJavaScriptResultHelper onEvaluateJavaScriptResultHelper,
            final String linkId) throws Exception {

        Assert.assertTrue(CriteriaHelper.pollForCriteria(new Criteria() {
            @Override
            public boolean isSatisfied() {
                try {
                    String linkIsNotNull = executeJavaScriptAndWaitForResult(testCase, awContents,
                            onEvaluateJavaScriptResultHelper,
                            "document.getElementById('" + linkId + "') != null");
                    return linkIsNotNull.equals("true");
                } catch (Throwable t) {
                    t.printStackTrace();
                    Assert.fail("Failed to check if DOM is loaded: " + t.toString());
                    return false;
                }
            }
        }, WAIT_TIMEOUT_MS, CHECK_INTERVAL));

        testCase.getInstrumentation().runOnMainSync(new Runnable() {
            @Override
            public void run() {
                awContents.getWebContents().evaluateJavaScript(
                        "var evObj = document.createEvent('Events'); " +
                        "evObj.initEvent('click', true, false); " +
                        "document.getElementById('" + linkId + "').dispatchEvent(evObj);" +
                        "console.log('element with id [" + linkId + "] clicked');",
                        null);
            }
        });
    }

    public static String executeJavaScriptAndWaitForResult(
            InstrumentationTestCase testCase,
            final AwContents awContents,
            final OnEvaluateJavaScriptResultHelper onEvaluateJavaScriptResultHelper,
            final String code) throws Exception {
        testCase.getInstrumentation().runOnMainSync(new Runnable() {
            @Override
            public void run() {
                onEvaluateJavaScriptResultHelper.evaluateJavaScript(
                        awContents.getWebContents(), code);
            }
        });
        onEvaluateJavaScriptResultHelper.waitUntilHasValue();
        Assert.assertTrue("Failed to retrieve JavaScript evaluation results.",
                onEvaluateJavaScriptResultHelper.hasValue());
        return onEvaluateJavaScriptResultHelper.getJsonResultAndClear();
    }
}