running pytest
running egg_info
writing invoke.egg-info/PKG-INFO
writing dependency_links to invoke.egg-info/dependency_links.txt
writing entry points to invoke.egg-info/entry_points.txt
writing top-level names to invoke.egg-info/top_level.txt
reading manifest file 'invoke.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
warning: no previously-included files matching '*' found under directory 'sites/*/_build'
warning: no previously-included files matching '*.pyc' found under directory '*'
warning: no previously-included files matching '*.pyo' found under directory '*'
warning: no previously-included files matching '*' found under directory '**/__pycache__'
adding license file 'LICENSE'
writing manifest file 'invoke.egg-info/SOURCES.txt'
running build_ext
ImportError while loading conftest '/build/python-invoke/src/invoke-1.6.0/tests/conftest.py'.
tests/conftest.py:14: in <module>
    from _util import support
tests/_util.py:20: in <module>
    from invoke import Program, Runner
invoke/__init__.py:2: in <module>
    from .collection import Collection  # noqa
invoke/collection.py:4: in <module>
    from .util import six, Lexicon, helpline
invoke/util.py:31: in <module>
    from lexicon import Lexicon  # noqa
E   ModuleNotFoundError: No module named 'lexicon'
==> ERROR: A failure occurred in check().
    Aborting...