@Test
	public void verifyExpressionWithExpression() {
		Context context = new Context();
		DataFactory factory = new DataFactory();
		IVPNumber a = factory.createIVPNumber();
		IVPNumber b = factory.createIVPNumber();
		IVPNumber c = factory.createIVPNumber();
		IVPNumber d = factory.createIVPNumber();

		a.setValueType(IVPValue.INTEGER_TYPE);
		b.setValueType(IVPValue.INTEGER_TYPE);
		c.setValueType(IVPValue.INTEGER_TYPE);
		d.setValueType(IVPValue.INTEGER_TYPE);

		context.addInt(a.getUniqueID(), 7);
		context.addInt(b.getUniqueID(), 10);
		context.addInt(c.getUniqueID(), 2);
		context.addInt(d.getUniqueID(), 2);

		Division division1 = factory.createDivision();
		division1.setExpressionA(a.getUniqueID());
		division1.setExpressionB(b.getUniqueID());

		Division division2 = factory.createDivision();
		division2.setExpressionA(c.getUniqueID());
		division2.setExpressionB(d.getUniqueID());

		Division division3 = factory.createDivision();
		division3.setExpressionA(division1.getUniqueID());
		division3.setExpressionB(division2.getUniqueID());

		HashMap map = new HashMap();
		map.put(division1.getUniqueID(), division1);
		map.put(division2.getUniqueID(), division2);
		map.put(division3.getUniqueID(), division3);
		map.put(a.getUniqueID(), a);
		map.put(b.getUniqueID(), b);
		map.put(c.getUniqueID(), c);
		map.put(d.getUniqueID(), d);
		// division3(division1(a / b) / division2(c / d))
		// ((a / b) / (c / d))
		IVPNumber result = (IVPNumber) division3.evaluate(context, map, factory);
		assertTrue(result.getValueType().equals(IVPValue.INTEGER_TYPE));
		assertTrue(context.getInt(result.getUniqueID()) == 0);
	}