455 lines
18 KiB
Python
455 lines
18 KiB
Python
#!/usr/bin/env python3
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import hashlib
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import importlib.util
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import json
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import unittest
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from pathlib import Path
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from unittest import mock
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SCRIPT = Path(__file__).with_name("paired-corpus.py")
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SPEC = importlib.util.spec_from_file_location("paired_corpus", SCRIPT)
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paired_corpus = importlib.util.module_from_spec(SPEC)
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SPEC.loader.exec_module(paired_corpus)
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class MediaEnvironmentTests(unittest.TestCase):
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def test_canonical_light_default_motion_environment_matches(self):
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self.assertTrue(
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paired_corpus.media_matches_configured(
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dict(paired_corpus.EXPECTED_MEDIA_MATCHES)
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)
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)
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def test_dark_or_reduced_environment_is_rejected(self):
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dark = dict(paired_corpus.EXPECTED_MEDIA_MATCHES)
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dark["prefers_color_scheme_light"] = False
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dark["prefers_color_scheme_dark"] = True
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self.assertFalse(paired_corpus.media_matches_configured(dark))
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reduced = dict(paired_corpus.EXPECTED_MEDIA_MATCHES)
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reduced["prefers_reduced_motion_no_preference"] = False
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reduced["prefers_reduced_motion_reduce"] = True
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self.assertFalse(paired_corpus.media_matches_configured(reduced))
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class ControlledScrollTests(unittest.TestCase):
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def test_bottom_expression_resolves_live_document_height(self):
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expression = paired_corpus.scroll_eval_expression((12, "bottom"))
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self.assertIn("const requestedX=12", expression)
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self.assertIn(
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"requestedY=document.documentElement.scrollHeight", expression
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)
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self.assertIn("window.scrollTo(requestedX,requestedY)", expression)
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self.assertIn("preInitialActual", expression)
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self.assertIn("postInitialActual", expression)
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self.assertNotIn("behavior:'instant'", expression)
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def test_chromium_reassert_records_settled_and_final_offsets(self):
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class FakePage:
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def __init__(self):
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self.calls = []
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def evaluate(self, expression, argument):
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self.calls.append((expression, argument))
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return {
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"requested": {"x": 4, "y": 300},
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"pre_reassert_actual": {"x": 4, "y": 287},
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"final_actual": {"x": 4, "y": 300},
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"reassert_behavior": "instant",
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}
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page = FakePage()
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result = paired_corpus.reassert_chromium_controlled_scroll(
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page, (4, 300)
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)
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self.assertEqual(result["pre_reassert_actual"]["y"], 287)
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self.assertEqual(result["final_actual"]["y"], 300)
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expression, argument = page.calls[0]
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self.assertEqual(argument, [4, 300])
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self.assertIn('behavior: "instant"', expression)
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self.assertLess(
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expression.index("beforeReassert"),
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expression.index("window.scrollTo({"),
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)
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def test_capture_report_uses_post_settle_state(self):
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stdout = (
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"diagnostic\n"
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'{"evaluation":"{\\"sampled_phase\\":'
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'\\"capture-boundary-before-screenshot\\",'
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'\\"requested\\":null,\\"controlled_scroll\\":null}",'
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'"controlledScroll":{"requested":{"x":0,"y":2702},'
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'"preInitialActual":{"x":0,"y":0},'
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'"postInitialActual":{"x":0,"y":12},'
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'"initialBehavior":"authored",'
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'"initialPhase":"before-controlled-scroll-settle",'
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'"preReassertActual":{"x":0,"y":1791},'
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'"finalReassertActual":{"x":0,"y":1802},'
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'"behavior":"instant",'
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'"phase":"immediately-before-capture-state-and-screenshot"},'
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'"captureState":{"scrollX":0,"scrollY":1802,'
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'"innerWidth":1280,"innerHeight":900,'
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'"scrollWidth":1291,"scrollHeight":2702}}\n'
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)
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state = paired_corpus.parse_obscura_scroll_report(stdout)
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self.assertEqual(state["requested"], {"x": 0, "y": 2702})
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self.assertEqual(
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state["pre_reassert_actual"], {"x": 0, "y": 1791}
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)
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self.assertEqual(state["pre_initial_actual"], {"x": 0, "y": 0})
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self.assertEqual(state["post_initial_actual"], {"x": 0, "y": 12})
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self.assertEqual(
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state["final_reassert_actual"], {"x": 0, "y": 1802}
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)
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self.assertEqual(state["actual"], {"x": 0, "y": 1802})
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self.assertEqual(state["reassert_behavior"], "instant")
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self.assertEqual(state["content"]["height"], 2702)
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self.assertEqual(
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state["sampled_phase"], paired_corpus.CAPTURE_BOUNDARY_PHASE
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)
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def test_obscura_capture_exports_final_scroll_request_to_cli(self):
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environment = paired_corpus.obscura_environment(1280, 720)
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paired_corpus.with_controlled_scroll_environment(
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environment, (12, "bottom")
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)
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self.assertEqual(environment["OBSCURA_SHOT_SCROLL_X"], "12")
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self.assertEqual(environment["OBSCURA_SHOT_SCROLL_Y"], "bottom")
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self.assertEqual(environment["OBSCURA_SHOT_EVAL_AT_CAPTURE"], "1")
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def test_paired_state_expression_is_read_only_at_capture_boundary(self):
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expression = paired_corpus.obscura_state_eval_expression(
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None,
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[".card"],
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sampled_phase=paired_corpus.CAPTURE_BOUNDARY_PHASE,
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)
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self.assertIn(
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f'sampled_phase:"{paired_corpus.CAPTURE_BOUNDARY_PHASE}"',
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expression,
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)
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self.assertIn("geometry_probes:geometryProbes", expression)
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self.assertNotIn("window.scrollTo", expression)
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def test_every_capture_expression_samples_page_state_without_scrolling(self):
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expression = paired_corpus.obscura_state_eval_expression(None)
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self.assertIn("outer_html_fnv1a32", expression)
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self.assertIn("data-obscura-external-stylesheets", expression)
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self.assertIn("normalized_outer_html_fnv1a32", expression)
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self.assertIn("visible_text_fnv1a32", expression)
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self.assertIn("injectedStyles.reduce", expression)
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self.assertNotIn("cloneNode", expression)
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self.assertNotIn("window.scrollTo", expression)
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def test_capture_report_keeps_dom_state_and_authoritative_geometry(self):
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stdout = (
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'{"evaluation":"{\\"sampled_phase\\":'
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'\\"capture-boundary-before-screenshot\\",'
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'\\"document\\":{\\"ready_state\\":\\"complete\\",'
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'\\"element_count\\":7,\\"outer_html_fnv1a32\\":\\"12345678\\"},'
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'\\"geometry\\":{\\"document_scroll_height\\":999}}",'
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'"captureState":{"scrollX":3,"scrollY":40,'
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'"innerWidth":640,"innerHeight":480,'
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'"scrollWidth":650,"scrollHeight":1200}}\n'
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)
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state = paired_corpus.parse_obscura_capture_report(stdout)
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self.assertEqual(state["document"]["element_count"], 7)
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self.assertEqual(state["geometry"]["scroll_y"], 40)
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self.assertEqual(state["geometry"]["document_scroll_height"], 1200)
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self.assertTrue(state["state_and_screenshot_share_capture_boundary"])
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def test_legacy_pre_settle_report_is_not_relabelled_as_capture_state(self):
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stdout = (
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'{"evaluation":"{\\"sampled_phase\\":'
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'\\"before-cli-post-eval-settle\\",'
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'\\"document\\":{},\\"geometry\\":{}}",'
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'"captureState":{"scrollX":0,"scrollY":0,'
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'"innerWidth":640,"innerHeight":480,'
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'"scrollWidth":640,"scrollHeight":480}}\n'
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)
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state = paired_corpus.parse_obscura_capture_report(stdout)
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self.assertEqual(
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state["sampled_phase"], "before-cli-post-eval-settle"
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)
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self.assertEqual(
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state["screenshot_sampled_phase"],
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paired_corpus.CAPTURE_BOUNDARY_PHASE,
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)
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self.assertFalse(state["state_and_screenshot_share_capture_boundary"])
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def test_page_state_comparison_reports_provenance_and_geometry_deltas(self):
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obscura = {
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"document": {
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"ready_state": "complete",
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"element_count": 9,
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"outer_html_utf16": 100,
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"normalized_outer_html_utf16": 90,
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"visible_text_utf16": 30,
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"outer_html_fnv1a32": "aaaaaaaa",
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"normalized_outer_html_fnv1a32": "dddddddd",
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"visible_text_fnv1a32": "bbbbbbbb",
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},
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"geometry": {"document_scroll_height": 1200, "scroll_y": 300},
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}
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chromium = {
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"document": {
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"ready_state": "complete",
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"element_count": 7,
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"outer_html_utf16": 95,
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"normalized_outer_html_utf16": 90,
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"visible_text_utf16": 30,
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"outer_html_fnv1a32": "cccccccc",
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"normalized_outer_html_fnv1a32": "dddddddd",
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"visible_text_fnv1a32": "bbbbbbbb",
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},
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"geometry": {"document_scroll_height": 1000, "scroll_y": 250},
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}
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comparison = paired_corpus.compare_page_states(obscura, chromium)
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self.assertTrue(comparison["ready_state_equal"])
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self.assertEqual(comparison["element_count_delta"], 2)
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self.assertFalse(comparison["outer_html_fingerprint_equal"])
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self.assertTrue(comparison["normalized_outer_html_fingerprint_equal"])
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self.assertEqual(comparison["normalized_outer_html_utf16_delta"], 0)
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self.assertTrue(comparison["visible_text_fingerprint_equal"])
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self.assertEqual(
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comparison["geometry_delta"]["document_scroll_height"], 200
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)
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self.assertEqual(comparison["geometry_delta"]["scroll_y"], 50)
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def test_scroll_y_parser_accepts_bottom_and_integer(self):
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self.assertEqual(paired_corpus.parse_scroll_y("bottom"), "bottom")
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self.assertEqual(paired_corpus.parse_scroll_y("-20"), -20)
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class GeometryProbeTests(unittest.TestCase):
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@staticmethod
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def chromium_state():
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return {
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"document": {
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"outer_html_sha256": "outer",
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"visible_text_sha256": "text",
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},
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"geometry_probes": [],
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}
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class FakePage:
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def __init__(self, state):
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self.state = state
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self.calls = []
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def evaluate(self, expression, *args):
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self.calls.append((expression, args))
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return self.state
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def test_default_state_expressions_do_not_include_probe_work(self):
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obscura_expression = paired_corpus.obscura_state_eval_expression(None)
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self.assertNotIn("sampleGeometrySelector", obscura_expression)
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self.assertNotIn("geometry_probes", obscura_expression)
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page = self.FakePage(self.chromium_state())
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paired_corpus.capture_chromium_state(page)
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self.assertEqual(len(page.calls), 1)
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expression, args = page.calls[0]
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self.assertEqual(args, ())
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self.assertNotIn("sampleGeometrySelector", expression)
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self.assertNotIn("geometry_probes", expression)
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self.assertNotIn("async ", expression)
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self.assertNotIn("await ", expression)
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self.assertNotIn("crypto.subtle", expression)
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self.assertIn(
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f'sampled_phase: "{paired_corpus.CAPTURE_BOUNDARY_PHASE}"',
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expression,
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)
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def test_chromium_snapshot_paints_before_host_hashing(self):
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events = []
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first_state = {
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"_hash_sources": {
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"dom": "<html></html>",
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"normalized_dom": "<html></html>",
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"visible_text": "hello",
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},
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"document": {},
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}
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second_state = {
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"_hash_sources": {
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"dom": "<html></html>",
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"normalized_dom": "<html></html>",
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"visible_text": "hello",
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},
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"document": {},
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}
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class OrderedPage:
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def __init__(self):
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self.states = [first_state, second_state]
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def evaluate(self, expression, *args):
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events.append("evaluate")
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return self.states.pop(0)
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def screenshot(self, **kwargs):
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events.append("screenshot")
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real_sha256 = hashlib.sha256
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def ordered_sha256(value):
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events.append("sha256")
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return real_sha256(value)
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with mock.patch.object(
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paired_corpus.hashlib,
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"sha256",
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side_effect=ordered_sha256,
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):
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captured, boundary = paired_corpus.capture_chromium_image(
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OrderedPage(), Path("/tmp/not-written.png")
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)
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self.assertEqual(
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events,
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["evaluate", "screenshot", "evaluate", "sha256", "sha256", "sha256"],
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)
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self.assertTrue(boundary["stable"])
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self.assertNotIn("_hash_sources", captured)
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self.assertEqual(
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captured["document"]["outer_html_sha256"],
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hashlib.sha256(b"<html></html>").hexdigest(),
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)
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self.assertEqual(
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captured["document"]["normalized_outer_html_sha256"],
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hashlib.sha256(b"<html></html>").hexdigest(),
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)
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self.assertEqual(
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captured["document"]["visible_text_sha256"],
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hashlib.sha256(b"hello").hexdigest(),
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)
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def test_repeatable_selectors_are_passed_safely_in_one_state_expression(self):
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selectors = ["header nav a", '[data-label="a\\\"b"]', "["]
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obscura_expression = paired_corpus.obscura_state_eval_expression(
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(0, 25), selectors
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)
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encoded = json.dumps(selectors, ensure_ascii=True, separators=(",", ":"))
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self.assertIn(encoded, obscura_expression)
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self.assertIn("sampleGeometrySelector", obscura_expression)
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self.assertIn("catch(error)", obscura_expression)
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self.assertIn("geometry_probes:geometryProbes", obscura_expression)
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page = self.FakePage(self.chromium_state())
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paired_corpus.capture_chromium_state(page, selectors)
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self.assertEqual(len(page.calls), 1)
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expression, args = page.calls[0]
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self.assertEqual(args, (selectors,))
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self.assertIn("querySelectorAll(selector)", expression)
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self.assertIn("catch(error)", expression)
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self.assertIn("font_family:style.fontFamily", expression)
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self.assertIn("line_height:style.lineHeight", expression)
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self.assertIn("white_space:style.whiteSpace", expression)
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self.assertIn("geometry_probes: geometryProbes", expression)
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self.assertIn(
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f'sampled_phase: "{paired_corpus.CAPTURE_BOUNDARY_PHASE}"',
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expression,
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)
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def test_probe_comparison_reports_raw_deltas_and_invalid_errors(self):
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obscura = {
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"geometry_probes": [
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{
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"selector": ".card",
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"valid": True,
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"count": 2,
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"rects": [
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{
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"x": 11,
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"y": 18,
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"width": 100,
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"height": 40,
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"visible": True,
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}
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],
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"error": None,
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},
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{
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"selector": "[",
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"valid": False,
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"count": None,
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"rects": [],
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"error": {"name": "SyntaxError", "message": "invalid selector"},
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},
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]
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}
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chromium = {
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"geometry_probes": [
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{
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"selector": ".card",
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"valid": True,
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"count": 1,
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"rects": [
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{
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"x": 10,
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"y": 20,
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"width": 98,
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"height": 40,
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"visible": False,
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}
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],
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"error": None,
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},
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{
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"selector": "[",
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"valid": False,
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"count": None,
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"rects": [],
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"error": {"name": "SyntaxError", "message": "invalid selector"},
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},
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]
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}
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comparison = paired_corpus.compare_geometry_probes(obscura, chromium)
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self.assertEqual(comparison[0]["counts"]["delta"], 1)
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self.assertEqual(
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comparison[0]["rect_deltas"][0]["delta"],
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{"x": 1, "y": -2, "width": 2, "height": 0},
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)
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self.assertEqual(
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comparison[0]["rect_deltas"][0]["visibility"],
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{"obscura": True, "chromium": False},
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)
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self.assertEqual(comparison[1]["valid"], {"obscura": False, "chromium": False})
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self.assertIsNone(comparison[1]["counts"]["delta"])
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self.assertEqual(comparison[1]["rects_compared"], 0)
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class AnimationSamplingTests(unittest.TestCase):
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class FakePage:
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def __init__(self):
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self.calls = []
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def evaluate(self, expression, *args):
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self.calls.append((expression, args))
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return {
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"supported": True,
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"requested_ms": args[0],
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"discovered": 3,
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"frozen": 3,
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"failures": [],
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}
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def test_explicit_sample_pauses_and_seeks_current_animations(self):
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page = self.FakePage()
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result = paired_corpus.freeze_chromium_animations(page, 0)
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self.assertEqual(result["requested_ms"], 0)
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self.assertEqual(len(page.calls), 1)
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expression, args = page.calls[0]
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self.assertEqual(args, (0,))
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self.assertIn("document.getAnimations()", expression)
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self.assertIn("animation.pause()", expression)
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self.assertIn("animation.currentTime = sampleMs", expression)
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self.assertIn("getBoundingClientRect", expression)
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if __name__ == "__main__":
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unittest.main()
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