| # Copyright 2017 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. |
| |
| import os |
| import shutil |
| import tempfile |
| |
| from telemetry import decorators |
| from telemetry.testing import options_for_unittests |
| from telemetry.testing import page_test_test_case |
| from telemetry.util import image_util |
| from contrib.cluster_telemetry import screenshot |
| |
| class ScreenshotUnitTest(page_test_test_case.PageTestTestCase): |
| |
| def setUp(self): |
| self._options = options_for_unittests.GetCopy() |
| self._png_outdir = tempfile.mkdtemp('_png_test') |
| |
| def tearDown(self): |
| shutil.rmtree(self._png_outdir) |
| |
| @decorators.Enabled('linux') |
| def testScreenshot(self): |
| # Screenshots for Cluster Telemetry purposes currently only supported on |
| # Linux platform. |
| page_set = self.CreateStorySetFromFileInUnittestDataDir( |
| 'screenshot_test.html') |
| measurement = screenshot.Screenshot(self._png_outdir) |
| self.RunMeasurement(measurement, page_set, options=self._options) |
| |
| path = self._png_outdir + '/' + page_set.stories[0].file_safe_name + '.png' |
| self.assertTrue(os.path.exists(path)) |
| self.assertTrue(os.path.isfile(path)) |
| self.assertTrue(os.access(path, os.R_OK)) |
| |
| image = image_util.FromPngFile(path) |
| screenshot_pixels = image_util.Pixels(image) |
| special_colored_pixel = bytearray([217, 115, 43]) |
| self.assertTrue(special_colored_pixel in screenshot_pixels) |
| |
| @decorators.Enabled('linux') |
| def testIsScreenshotWithinDynamicContentThreshold(self): |
| # TODO(lchoi): This unit test fails on Windows due to an apparent platform |
| # dependent image decoding behavior that will need to be investigated in the |
| # future if Cluster Telemetry ever becomes compatible with Windows. |
| width = 2 |
| height = 1 |
| num_total_pixels = width * height |
| |
| content_pixels = bytearray([0, 0, 0, 128, 128, 128]) |
| base_screenshot = image_util.FromRGBPixels(width, height, content_pixels) |
| |
| next_pixels = bytearray([1, 1, 1, 128, 128, 128]) |
| next_screenshot = image_util.FromRGBPixels(width, height, next_pixels) |
| expected_pixels = bytearray([0, 255, 255, 128, 128, 128]) |
| self.assertTrue(screenshot.IsScreenshotWithinDynamicContentThreshold( |
| base_screenshot, next_screenshot, content_pixels, |
| num_total_pixels, 0.51)) |
| self.assertTrue(expected_pixels == content_pixels) |
| |
| next_pixels = bytearray([0, 0, 0, 1, 1, 1]) |
| next_screenshot = image_util.FromRGBPixels(2, 1, next_pixels) |
| expected_pixels = bytearray([0, 255, 255, 0, 255, 255]) |
| self.assertTrue(screenshot.IsScreenshotWithinDynamicContentThreshold( |
| base_screenshot, next_screenshot, content_pixels, |
| num_total_pixels, 0.51)) |
| self.assertTrue(expected_pixels == content_pixels) |
| self.assertFalse(screenshot.IsScreenshotWithinDynamicContentThreshold( |
| base_screenshot, next_screenshot, content_pixels, |
| num_total_pixels, 0.49)) |
