@Test
	public void verifyNumberErrorMessages() {
		Context c = new Context();
		IVPError e1 = c.addInt("key1", 10);
		IVPError e2 = c.addInt("key1", 11);
		assertTrue(e2.getErrorMessage().equals(Messages.getString("Context.keyExists")));
		assertTrue(e1 == null);
	}