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findExchReact.R

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    test_while_interpreter.py 967 B
    from whileinterpreter import interpret
    from test_loop_interpreter import LOOPInterpreterTest
    import unittest
    
    
    class WHILEInterpreterTest(LOOPInterpreterTest):
        def test_while_forbidden_identifier(self):
            with self.assertRaises(SyntaxError):
                interpret("LOOP x1 DO WHILE x1 != 0 DO x0:=x0+1 END END ")
    
        def test_while(self):
            self.assertEqual(interpret('x1:=1; WHILE x1 != 0 DO x0:=2; x1:=x1-1 END'), 2)
            self.assertEqual(interpret('WHILE x1 /= 0 DO x0:=1 END'), 0)
            self.assertEqual(interpret('WHILE x1 /= 0 DO WHILE x1 /= 0 DO x0:=2 END END'), 0)
    
        def test_while_non_zero(self):
            with self.assertRaises(SyntaxError):
                interpret("x1:= 1; WHILE x1 /= 1 DO x0:=2 END")
            with self.assertRaises(SyntaxError):
                interpret("x1:= 2; WHILE x1 /= 1 DO x0:=2 END")
            with self.assertRaises(SyntaxError):
                interpret("x1:= 1; WHILE x1 /= 0 DO WHILE x1 /= 1 DO x0:=2 END END")