def spy(self, obj, attr=None):
        return self.stub(obj, attr).spy()
Test writing special numbers.
dataset/ETHPy150Open agoragames/chai/chai/chai.py/ChaiBase.spy--crossover with--dataset/ETHPy150Open jmcnamara/XlsxWriter/xlsxwriter/test/comparison/test_types07.py/TestCompareXLSXFiles.test_write_nan_and_inf_write_as_string