def test_write_control_dict(tmpcase):
"""Writing to a mutable control dict should be reflected on disk."""
with tmpcase.mutable_data_file(FileName.CONTROL) as control:
control['testing'] = 'oneTwoThree'
dict_path = os.path.join(tmpcase.root_dir_path, 'system', 'controlDict')
assert os.path.isfile(dict_path)
content = read_data_file(dict_path)
assert 'testing' in content
assert content['testing'] == 'oneTwoThree'
def test_read_data_file_needs_file(tmpdir):
"""Reading a non-existent dictionary file raises."""
pn = tmpdir.join('noSuchDict').strpath
assert not os.path.isfile(pn)
with pytest.raises(IOError):
read_data_file(pn)
