def test_create_using(self):
m = self.makeModel()
# TODO: this is duplicate code with other transformation tests
modelcopy = TransformationFactory('gdp.cuttingplane').create_using(m)
modelcopy_buf = StringIO()
modelcopy.pprint(ostream=modelcopy_buf)
modelcopy_output = modelcopy_buf.getvalue()
TransformationFactory('gdp.cuttingplane').apply_to(m)
model_buf = StringIO()
m.pprint(ostream=model_buf)
model_output = model_buf.getvalue()
self.maxDiff = None
self.assertMultiLineEqual(modelcopy_output, model_output)
