import dis
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from test.support import import_module
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import unittest
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_opcode = import_module("_opcode")
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class OpcodeTests(unittest.TestCase):
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def test_stack_effect(self):
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self.assertEqual(_opcode.stack_effect(dis.opmap['POP_TOP']), -1)
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self.assertEqual(_opcode.stack_effect(dis.opmap['DUP_TOP_TWO']), 2)
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self.assertEqual(_opcode.stack_effect(dis.opmap['BUILD_SLICE'], 0), -1)
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self.assertEqual(_opcode.stack_effect(dis.opmap['BUILD_SLICE'], 1), -1)
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self.assertEqual(_opcode.stack_effect(dis.opmap['BUILD_SLICE'], 3), -2)
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self.assertRaises(ValueError, _opcode.stack_effect, 30000)
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self.assertRaises(ValueError, _opcode.stack_effect, dis.opmap['BUILD_SLICE'])
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self.assertRaises(ValueError, _opcode.stack_effect, dis.opmap['POP_TOP'], 0)
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if __name__ == "__main__":
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unittest.main()
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