content/public/android/javatests/src/org/chromium/content/browser/ViewportTest.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.content.browser;

import android.content.Context;
import android.util.DisplayMetrics;
import android.view.WindowManager;

import org.chromium.base.test.util.DisabledTest;
import org.chromium.content.browser.test.util.JavaScriptUtils;
import org.chromium.content.browser.test.util.TestCallbackHelperContainer;

/**
 * Test suite for viewport-related properties.
 */
public class ViewportTest extends ContentViewTestBase {

    private TestCallbackHelperContainer mCallbackHelper;

    /**
     * Returns the TestCallbackHelperContainer associated with this ContentView,
     * or creates it lazily.
     */
    protected TestCallbackHelperContainer getTestCallbackHelperContainer() {
        if (mCallbackHelper == null) {
            mCallbackHelper = new TestCallbackHelperContainer(getContentView());
        }
        return mCallbackHelper;
    }

    protected String evaluateStringValue(String expression) throws Throwable {
        return JavaScriptUtils.executeJavaScriptAndWaitForResult(getContentView(),
                getTestCallbackHelperContainer(), expression);
    }

    protected float evaluateFloatValue(String expression) throws Throwable {
        return Float.valueOf(evaluateStringValue(expression));
    }

    protected int evaluateIntegerValue(String expression) throws Throwable {
        return Integer.valueOf(evaluateStringValue(expression));
    }

    /*
    @MediumTest
    @Feature({"Viewport", "InitialViewportSize"})
    https://bugs.webkit.org/show_bug.cgi?id=107424
    */
    @DisabledTest
    public void testDefaultViewportSize() throws Throwable {
        launchContentShellWithUrl("about:blank");
        waitForActiveShellToBeDoneLoading();

        Context context = getInstrumentation().getTargetContext();
        WindowManager winManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics metrics = new DisplayMetrics();
        winManager.getDefaultDisplay().getMetrics(metrics);

        // window.devicePixelRatio should match the default display. Only check to 1 decimal place
        // to allow for rounding.
        assertEquals(String.format("%.1g", metrics.density),
                String.format("%.1g", evaluateFloatValue("window.devicePixelRatio")));

        // Check that the viewport width is vaguely sensible.
        int viewportWidth = evaluateIntegerValue("document.documentElement.clientWidth");
        assertTrue(Math.abs(evaluateIntegerValue("window.innerWidth") - viewportWidth) <= 1);
        assertTrue(viewportWidth >= 979);
        assertTrue(viewportWidth <= Math.max(981, metrics.widthPixels / metrics.density + 1));
    }
}