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

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

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

		Addition addition1 = factory.createAddition();
		addition1.setExpressionA(a.getUniqueID());
		addition1.setExpressionB(b.getUniqueID());

		Addition addition2 = factory.createAddition();
		addition2.setExpressionA(c.getUniqueID());
		addition2.setExpressionB(addition1.getUniqueID());

		HashMap map = new HashMap();
		map.put(addition1.getUniqueID(), addition1);
		map.put(addition2.getUniqueID(), addition2);
		map.put(a.getUniqueID(), a);
		map.put(b.getUniqueID(), b);
		map.put(c.getUniqueID(), c);
		// addition2(c + addition1(a + b))
		// c + (a + b)
		IVPNumber result = (IVPNumber) addition2.evaluate(context, map, factory);
		assertTrue(result.getValueType().equals(IVPValue.INTEGER_TYPE));
		assertTrue(context.getInt(result.getUniqueID()) == 19);
	}