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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
import base64
import hashlib
import imghdr
import struct
import urllib
from marionette_driver import By
from marionette_driver.errors import JavascriptException, NoSuchWindowException
from marionette_harness import (
MarionetteTestCase,
skip,
skip_if_mobile,
WindowManagerMixin,
)
def inline(doc, mime="text/html;charset=utf-8"):
return "data:{0},{1}".format(mime, urllib.quote(doc))
box = inline("<body><div id='box'><p id='green' style='width: 50px; height: 50px; "
"background: silver;'></p></div></body>")
input = inline("<body><input id='text-input'></input></body>")
long = inline("<body style='height: 300vh'><p style='margin-top: 100vh'>foo</p></body>")
short = inline("<body style='height: 10vh'></body>")
svg = inline("""
<svg xmlns="http://www.w3.org/2000/svg" height="20" width="20">
<rect height="20" width="20"/>
</svg>""", mime="image/svg+xml")
class ScreenCaptureTestCase(MarionetteTestCase):
def setUp(self):
super(ScreenCaptureTestCase, self).setUp()
self._device_pixel_ratio = None
@property
def device_pixel_ratio(self):
if self._device_pixel_ratio is None:
self._device_pixel_ratio = self.marionette.execute_script("""
return window.devicePixelRatio
""")
return self._device_pixel_ratio
@property
def document_element(self):
return self.marionette.find_element(By.CSS_SELECTOR, ":root")
@property
def page_y_offset(self):
return self.marionette.execute_script("return window.pageYOffset")
@property
def viewport_dimensions(self):
return self.marionette.execute_script("""
return [arguments[0].clientWidth,
arguments[0].clientHeight];
""", script_args=[self.document_element])
def assert_png(self, screenshot):
"""Test that screenshot is a Base64 encoded PNG file."""
image = base64.decodestring(screenshot)
self.assertEqual(imghdr.what("", image), "png")
def assert_formats(self, element=None):
if element is None:
element = self.document_element
screenshot_default = self.marionette.screenshot(element=element)
screenshot_image = self.marionette.screenshot(element=element, format="base64")
binary1 = self.marionette.screenshot(element=element, format="binary")
binary2 = self.marionette.screenshot(element=element, format="binary")
hash1 = self.marionette.screenshot(element=element, format="hash")
hash2 = self.marionette.screenshot(element=element, format="hash")
# Valid data should have been returned
self.assert_png(screenshot_image)
self.assertEqual(imghdr.what("", binary1), "png")
self.assertEqual(screenshot_image, base64.b64encode(binary1))
self.assertEqual(hash1, hashlib.sha256(screenshot_image).hexdigest())
# Different formats produce different data
self.assertNotEqual(screenshot_image, binary1)
self.assertNotEqual(screenshot_image, hash1)
self.assertNotEqual(binary1, hash1)
# A second capture should be identical
self.assertEqual(screenshot_image, screenshot_default)
self.assertEqual(binary1, binary2)
self.assertEqual(hash1, hash2)
def get_element_dimensions(self, element):
rect = element.rect
return rect["width"], rect["height"]
def get_image_dimensions(self, screenshot):
self.assert_png(screenshot)
image = base64.decodestring(screenshot)
width, height = struct.unpack(">LL", image[16:24])
return int(width), int(height)
def scale(self, rect):
return (int(rect[0] * self.device_pixel_ratio),
int(rect[1] * self.device_pixel_ratio))
class TestScreenCaptureChrome(WindowManagerMixin, ScreenCaptureTestCase):
def setUp(self):
super(TestScreenCaptureChrome, self).setUp()
self.marionette.set_context("chrome")
def tearDown(self):
self.close_all_windows()
super(TestScreenCaptureChrome, self).tearDown()
@property
def window_dimensions(self):
return tuple(self.marionette.execute_script("""
let el = document.documentElement;
let rect = el.getBoundingClientRect();
return [rect.width, rect.height];
"""))
def open_dialog(self, url=None, width=None, height=None):
if url is None:
url = "chrome://marionette/content/test_dialog.xul"
def opener():
features = "chrome"
if height is not None:
features += ",height={}".format(height)
if width is not None:
features += ",width={}".format(width)
self.marionette.execute_script("""
window.open(arguments[0], "", arguments[1]);
""", script_args=[url, features])
return self.open_window(opener)
def test_capture_different_context(self):
"""Check that screenshots in content and chrome are different."""
with self.marionette.using_context("content"):
screenshot_content = self.marionette.screenshot()
screenshot_chrome = self.marionette.screenshot()
self.assertNotEqual(screenshot_content, screenshot_chrome)
@skip_if_mobile("Fennec doesn't support other chrome windows")
def test_capture_element(self):
dialog = self.open_dialog()
self.marionette.switch_to_window(dialog)
# Ensure we only capture the element
el = self.marionette.find_element(By.ID, "test-list")
screenshot_element = self.marionette.screenshot(element=el)
self.assertEqual(self.scale(self.get_element_dimensions(el)),
self.get_image_dimensions(screenshot_element))
# Ensure we do not capture the full window
screenshot_dialog = self.marionette.screenshot()
self.assertNotEqual(screenshot_dialog, screenshot_element)
self.marionette.close_chrome_window()
self.marionette.switch_to_window(self.start_window)
@skip_if_mobile("Fennec doesn't support other chrome windows")
def test_capture_flags(self):
dialog = self.open_dialog()
self.marionette.switch_to_window(dialog)
textbox = self.marionette.find_element(By.ID, "text-box")
textbox.send_keys("")
screenshot_focus = self.marionette.screenshot()
self.marionette.execute_script("arguments[0].blur();", script_args=[textbox])
screenshot_no_focus = self.marionette.screenshot()
self.marionette.close_chrome_window()
self.marionette.switch_to_window(self.start_window)
self.assertNotEqual(screenshot_focus, screenshot_no_focus)
def test_capture_full_area(self):
# A full capture is not the outer dimensions of the window,
# but instead the bounding box of the window's root node (documentElement).
screenshot_full = self.marionette.screenshot()
screenshot_root = self.marionette.screenshot(element=self.document_element)
self.assert_png(screenshot_full)
self.assert_png(screenshot_root)
self.assertEqual(screenshot_root, screenshot_full)
self.assertEqual(self.scale(self.get_element_dimensions(self.document_element)),
self.get_image_dimensions(screenshot_full))
@skip_if_mobile("Fennec doesn't support other chrome windows")
def test_capture_viewport(self):
# Load a HTML test page into the chrome window to get scrollbars
test_page = self.marionette.absolute_url("test.html")
dialog = self.open_dialog(url=test_page, width=50, height=50)
self.marionette.switch_to_window(dialog)
# Size of screenshot has to match viewport size
screenshot = self.marionette.screenshot(full=False)
self.assert_png(screenshot)
self.assertEqual(self.scale(self.viewport_dimensions),
self.get_image_dimensions(screenshot))
self.assertNotEqual(self.scale(self.window_dimensions),
self.get_image_dimensions(screenshot))
self.marionette.close_chrome_window()
self.marionette.switch_to_window(self.start_window)
@skip_if_mobile("Fennec doesn't support other chrome windows")
def test_capture_window_already_closed(self):
dialog = self.open_dialog()
self.marionette.switch_to_window(dialog)
self.marionette.close_chrome_window()
self.assertRaises(NoSuchWindowException, self.marionette.screenshot)
self.marionette.switch_to_window(self.start_window)
@skip_if_mobile("Fennec doesn't support other chrome windows")
def test_formats(self):
dialog = self.open_dialog()
self.marionette.switch_to_window(dialog)
self.assert_formats()
self.marionette.close_chrome_window()
self.marionette.switch_to_window(self.start_window)
def test_format_unknown(self):
with self.assertRaises(ValueError):
self.marionette.screenshot(format="cheese")
@skip_if_mobile("Fennec doesn't support other chrome windows")
def test_highlight_elements(self):
dialog = self.open_dialog()
self.marionette.switch_to_window(dialog)
# Highlighting the element itself shouldn't make the image larger
element = self.marionette.find_element(By.ID, "test-list")
screenshot_element = self.marionette.screenshot(element=element)
screenshot_highlight = self.marionette.screenshot(element=element,
highlights=[element])
self.assertEqual(self.scale(self.get_element_dimensions(element)),
self.get_image_dimensions(screenshot_element))
self.assertNotEqual(screenshot_element, screenshot_highlight)
# Highlighting a sub element
button = self.marionette.find_element(By.ID, "choose-button")
screenshot_highlight_button = self.marionette.screenshot(element=element,
highlights=[button])
self.assertNotEqual(screenshot_element, screenshot_highlight_button)
self.assertNotEqual(screenshot_highlight, screenshot_highlight_button)
self.marionette.close_chrome_window()
self.marionette.switch_to_window(self.start_window)
def test_highlight_element_not_seen(self):
"""Check that for not found elements an exception is raised."""
with self.marionette.using_context('content'):
self.marionette.navigate(box)
content_element = self.marionette.find_element(By.ID, "green")
self.assertRaisesRegexp(JavascriptException, "Element reference not seen before",
self.marionette.screenshot, highlights=[content_element])
chrome_document_element = self.document_element
with self.marionette.using_context('content'):
self.assertRaisesRegexp(JavascriptException, "Element reference not seen before",
self.marionette.screenshot,
highlights=[chrome_document_element])
class TestScreenCaptureContent(WindowManagerMixin, ScreenCaptureTestCase):
def setUp(self):
super(TestScreenCaptureContent, self).setUp()
self.marionette.set_context("content")
def tearDown(self):
self.close_all_tabs()
super(TestScreenCaptureContent, self).tearDown()
@property
def scroll_dimensions(self):
return tuple(self.marionette.execute_script("""
return [document.body.scrollWidth, document.body.scrollHeight]
"""))
@skip_if_mobile("Needs application independent method to open a new tab")
def test_capture_tab_already_closed(self):
tab = self.open_tab()
self.marionette.switch_to_window(tab)
self.marionette.close()
self.assertRaises(NoSuchWindowException, self.marionette.screenshot)
self.marionette.switch_to_window(self.start_tab)
def test_capture_element(self):
self.marionette.navigate(box)
el = self.marionette.find_element(By.TAG_NAME, "div")
screenshot = self.marionette.screenshot(element=el)
self.assert_png(screenshot)
self.assertEqual(self.scale(self.get_element_dimensions(el)),
self.get_image_dimensions(screenshot))
@skip("Bug 1213875")
def test_capture_element_scrolled_into_view(self):
self.marionette.navigate(long)
el = self.marionette.find_element(By.TAG_NAME, "p")
screenshot = self.marionette.screenshot(element=el)
self.assert_png(screenshot)
self.assertEqual(self.scale(self.get_element_dimensions(el)),
self.get_image_dimensions(screenshot))
self.assertGreater(self.page_y_offset, 0)
@skip("Bug 1330560 - AssertionError: u'iVBORw0KGgoA... (images unexpectedly equal)")
def test_capture_flags(self):
self.marionette.navigate(input)
textbox = self.marionette.find_element(By.ID, "text-input")
textbox.send_keys("")
screenshot_focus = self.marionette.screenshot()
self.marionette.execute_script("arguments[0].blur();", script_args=[textbox])
screenshot_no_focus = self.marionette.screenshot()
self.assertNotEqual(screenshot_focus, screenshot_no_focus)
@skip_if_mobile("Bug 1330642 - Tuples differ: (1960, 11130) != (1960, 11129)")
def test_capture_html_document_element(self):
self.marionette.navigate(long)
screenshot = self.marionette.screenshot()
self.assert_png(screenshot)
self.assertEqual(self.scale(self.scroll_dimensions),
self.get_image_dimensions(screenshot))
def test_capture_svg_document_element(self):
self.marionette.navigate(svg)
screenshot = self.marionette.screenshot()
self.assert_png(screenshot)
self.assertEqual(self.scale(self.get_element_dimensions(self.document_element)),
self.get_image_dimensions(screenshot))
def test_capture_viewport(self):
url = self.marionette.absolute_url("clicks.html")
self.marionette.navigate(short)
self.marionette.navigate(url)
screenshot = self.marionette.screenshot(full=False)
self.assert_png(screenshot)
self.assertEqual(self.scale(self.viewport_dimensions),
self.get_image_dimensions(screenshot))
def test_capture_viewport_after_scroll(self):
self.marionette.navigate(long)
before = self.marionette.screenshot()
el = self.marionette.find_element(By.TAG_NAME, "p")
self.marionette.execute_script(
"arguments[0].scrollIntoView()", script_args=[el])
after = self.marionette.screenshot(full=False)
self.assertNotEqual(before, after)
self.assertGreater(self.page_y_offset, 0)
def test_formats(self):
self.marionette.navigate(box)
# Use a smaller region to speed up the test
element = self.marionette.find_element(By.TAG_NAME, "div")
self.assert_formats(element=element)
def test_format_unknown(self):
with self.assertRaises(ValueError):
self.marionette.screenshot(format="cheese")
def test_highlight_elements(self):
self.marionette.navigate(box)
element = self.marionette.find_element(By.TAG_NAME, "div")
# Highlighting the element itself shouldn't make the image larger
screenshot_element = self.marionette.screenshot(element=element)
screenshot_highlight = self.marionette.screenshot(element=element,
highlights=[element])
self.assertEqual(self.scale(self.get_element_dimensions(element)),
self.get_image_dimensions(screenshot_highlight))
self.assertNotEqual(screenshot_element, screenshot_highlight)
# Highlighting a sub element
paragraph = self.marionette.find_element(By.ID, "green")
screenshot_highlight_paragraph = self.marionette.screenshot(element=element,
highlights=[paragraph])
self.assertNotEqual(screenshot_element, screenshot_highlight_paragraph)
self.assertNotEqual(screenshot_highlight, screenshot_highlight_paragraph)
def test_scroll_default(self):
self.marionette.navigate(long)
before = self.page_y_offset
el = self.marionette.find_element(By.TAG_NAME, "p")
self.marionette.screenshot(element=el, format="hash")
self.assertNotEqual(before, self.page_y_offset)
def test_scroll(self):
self.marionette.navigate(long)
before = self.page_y_offset
el = self.marionette.find_element(By.TAG_NAME, "p")
self.marionette.screenshot(element=el, format="hash", scroll=True)
self.assertNotEqual(before, self.page_y_offset)
def test_scroll_off(self):
self.marionette.navigate(long)
el = self.marionette.find_element(By.TAG_NAME, "p")
before = self.page_y_offset
self.marionette.screenshot(element=el, format="hash", scroll=False)
self.assertEqual(before, self.page_y_offset)
def test_scroll_no_element(self):
self.marionette.navigate(long)
before = self.page_y_offset
self.marionette.screenshot(format="hash", scroll=True)
self.assertEqual(before, self.page_y_offset)
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