C:\pwb\GIT\core>pwb -lang:en wikibase_tests -v TestWriteNormalizeLang.test_normalize_lang
C:\pwb\GIT\core\pywikibot\config2.py:1136: _ConfigurationDeprecationWarning: "sysopnames" present in our user-config.py is no longer a supported configuration variable. Please inform the maintainers if you depend on it.
  warn('"{0}" present in our user-config.py is no longer a supported '
tests: max_retries reduced from 15 to 1
test_normalize_lang (__main__.TestWriteNormalizeLang)
Test _normalizeLanguages() method. ... ERROR

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ERROR: test_normalize_lang (__main__.TestWriteNormalizeLang)
Test _normalizeLanguages() method.
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Traceback (most recent call last):
  File ".\tests\wikibase_tests.py", line 1823, in test_normalize_lang
    response = WikibasePage._normalizeLanguages(lang_in)
  File "C:\pwb\GIT\core\pywikibot\page.py", line 4168, in _normalizeLanguages
    for key in data:
RuntimeError: dictionary keys changed during iteration

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Ran 1 test in 0.045s

FAILED (errors=1)

C:\pwb\GIT\core>RuntimeError: dictionary keys changed during iteration