===================== ERRORS =====================
                     _______________ ERROR collecting  ________________
                     .pants.d/test/pytest-prep/CPython-2.7.14/e05318e400ccbe67307e0b127231bb9714fad6ce-DefaultFingerprintStrategy_5143968036af/.deps/pytest-3.7.0-py2.py3-none-any.whl/_pytest/runner.py:201: in __init__
                         self.result = func()
                     .pants.d/test/pytest-prep/CPython-2.7.14/e05318e400ccbe67307e0b127231bb9714fad6ce-DefaultFingerprintStrategy_5143968036af/.deps/pytest-3.7.0-py2.py3-none-any.whl/_pytest/runner.py:261: in <lambda>
                         call = CallInfo(lambda: list(collector.collect()), "collect")
                     .pants.d/test/pytest-prep/CPython-2.7.14/e05318e400ccbe67307e0b127231bb9714fad6ce-DefaultFingerprintStrategy_5143968036af/.deps/pytest-3.7.0-py2.py3-none-any.whl/_pytest/main.py:475: in collect
                         for x in self._collect(arg):
                     .pants.d/test/pytest-prep/CPython-2.7.14/e05318e400ccbe67307e0b127231bb9714fad6ce-DefaultFingerprintStrategy_5143968036af/.deps/pytest-3.7.0-py2.py3-none-any.whl/_pytest/main.py:539: in _collect
                         for y in self.matchnodes(col, names):
                     .pants.d/test/pytest-prep/CPython-2.7.14/e05318e400ccbe67307e0b127231bb9714fad6ce-DefaultFingerprintStrategy_5143968036af/.deps/pytest-3.7.0-py2.py3-none-any.whl/_pytest/main.py:605: in matchnodes
                         num = len(nodes)
                     E   TypeError: object of type 'Package' has no len()
                      generated xml file: /Users/xinyu.liu/repos/webapp/monorepo/.pants.d/test/pytest/chat.tests.python.chatlib_test.test/junitxml/TEST-chat.tests.python.chatlib_test.test.xml
                     ============ 1 error in 0.17 seconds =============