A few mypy/test/testcmdline.py::PythonCmdlineSuite::reports.test test fail when lxml is built against libxml2-2.15 #20070
Description
Bug Report
Newer libxml2 versions changed the HTML output to use <meta charset="UTF-8"> instead of the long form. This causes a bunch of mismatches when running tests against lxml built locally (i.e. on Linux distributions), such as:
============================================================== FAILURES ===============================================================
______________________________________________________ testSpecialAnyHtmlReport _______________________________________________________
[gw0] linux -- Python 3.13.9 /tmp/mypy/.venv/bin/python3
data: /tmp/mypy/test-data/unit/reports.test:477:
Failed: Output file tmp/report/html/n.py.html did not match its expected output
-------------------------------------------------------- Captured stderr call ---------------------------------------------------------
Expected:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> (diff)
<link rel="stylesheet" type="text/css" href="../mypy-html.css">
</head>
<body>
...
</table>
</body>
</html>
Actual:
<html>
<head>
<meta charset="UTF-8"> (diff)
<link rel="stylesheet" type="text/css" href="../mypy-html.css">
</head>
<body>
...
</table>
</body>
</html>
Alignment of first line difference:
E: <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
A: <meta charset="UTF-8">
^
Update the test output using --update-data (implies -n0; you can additionally use the -k selector to update only specific tests)The full list of failures is:
FAILED mypy/test/testcmdline.py::PythonCmdlineSuite::reports.test::testUnreachableCodeMarkedAsAny
FAILED mypy/test/testcmdline.py::PythonCmdlineSuite::reports.test::testClassDefIsNotTreatedAsEmpty
FAILED mypy/test/testcmdline.py::PythonCmdlineSuite::reports.test::testTypeVarTreatedAsEmptyLine
FAILED mypy/test/testcmdline.py::PythonCmdlineSuite::reports.test::testHtmlReportMemberExprNoUnanalyzed
FAILED mypy/test/testcmdline.py::PythonCmdlineSuite::reports.test::testSpecialAnyHtmlReport
FAILED mypy/test/testcmdline.py::PythonCmdlineSuite::reports.test::testHtmlReportOnNamespacePackagesWithExplicitBases
Could the test be made more resilient to this difference, please?
To Reproduce
# install libxml2 >= 2.15, e.g.:
pacman -Syu libxml2 libxslt base-devel
uv venv -p 3.13
uv pip install --no-binary lxml -e . -r test-requirements.txt
.venv/bin/pytest mypy/test/testcmdline.py::PythonCmdlineSuite::reports.test
Expected Behavior
Tests passing.
Actual Behavior
Failures as noted above.
Your Environment
- Mypy version used: 1.18.2 and 2c6c395
- Python version used: 3.13.9