def test_bib_immutability(self):
"""
Attempting to set `refmanage.NonbibFile.bib` should raise AttributeError
"""
b = NonbibFile(self.invalid)
bib = b.bib
try:
b.bib = bib
except AttributeError:
# Attempting to set `path` attribute raises an error; test passed!
pass
else:
self.fail("NonbibFile.bib can be set after instantiation")
