def test_open(io):
("Node#open should return an open file")
io.open.return_value = 'an open file'
nd = Node('/foo/bar')
nd.open('wee.py').should.equal('an open file')
io.open.assert_once_called_with('/foo/bar/wee.py')
def test_open(io):
("Node#open should return an open file")
io.open.return_value = 'an open file'
nd = Node('/foo/bar')
nd.open('wee.py').should.equal('an open file')
io.open.assert_called_once_with('/foo/bar/wee.py')
