@Test
	public void verifyBooleanErrorMessages() {
		Context c = new Context();
		IVPError e1 = c.addBoolean("key1", new Boolean("true"));
		IVPError e2 = c.addBoolean("key1", new Boolean("true"));
		assertTrue(e2.getErrorMessage().equals(Messages.getString("Context.keyExists")));
		assertTrue(e1 == null);
	}