#!/usr/bin/env python3
"""Isolated browser tests of DOM reconciliation, preview alignment and owner labels.
Run from the repository root. Does not emulate the server or OT protocol.
"""
from __future__ import annotations
import base64
from pathlib import Path
from playwright.sync_api import sync_playwright
ROOT = Path(__file__).resolve().parents[1]
def module_url(content: str) -> str:
return "data:text/javascript;base64," + base64.b64encode(content.encode()).decode()
def main():
reconcile = (ROOT / "static/js/dom-reconcile.js").read_text()
editor_source = (ROOT / "static/js/note-editor.js").read_text()
presence_source = editor_source.split(" function updatePresence(users) {", 1)[1].split(" function updateLatency", 1)[0]
presence_source = "function updatePresence(users) {" + presence_source
badges_source = editor_source.split(" let renderedAuthorshipOwners = [];", 1)[1].split(" function syncOwnerLabels()", 1)[0]
badges_source = "let renderedAuthorshipOwners = [];" + badges_source
geometry_source = "let previewPositionCache = null;" + editor_source.split(" let previewPositionCache = null;", 1)[1].split(" function previewScrollAnchor()", 1)[0]
markdown = (ROOT / "static/js/markdown.js").read_text()
markdown = "const EMOJI_SHORTCODES = {}; const t = (key, v, fallback) => fallback; const parseImageAlias = () => null;\n" + "\n".join(
line for line in markdown.splitlines() if not line.startswith("import ")
) + "\nexport { firstRenderedTextRect };\n"
html = '''
'''.replace("__RECONCILE__", module_url(reconcile)).replace("__MARKDOWN__", module_url(markdown)).replace("__BADGES_SOURCE__", badges_source).replace("__PRESENCE_SOURCE__", presence_source).replace("__GEOMETRY_SOURCE__", geometry_source)
with sync_playwright() as playwright:
browser = playwright.chromium.launch(executable_path="/usr/bin/chromium", args=["--no-sandbox", "--disable-dev-shm-usage"])
try:
page = browser.new_page(viewport={"width": 1100, "height": 780})
errors = []
page.on("pageerror", lambda error: errors.append(str(error)))
page.set_content(html)
try:
page.wait_for_function("window.frontendTestsPassed===true", timeout=15000)
except Exception:
raise AssertionError(f"Browser errors: {errors}")
assert not errors, errors
print("PASS: keyed DOM list updates preserve node identity; identical list has zero mutations")
print("PASS: real presence update handles 1000 users with row/badge reuse, duplicates and XSS-safe text")
print("PASS: owner-label canvas transforms; preview alignment parity for 150 lines in Chromium")
print("PASS: preview geometry cache reuses measurements on scroll and invalidates on content change")
finally:
browser.close()
if __name__ == "__main__":
main()