@Test
public void testEmptyContext() {

    String inputExpression = "{}";
    BaseNode context = parse( inputExpression );
    assertThat( context, is( instanceOf( ContextNode.class ) ) );
    assertThat( context.getText(), is( inputExpression ) );
    ContextNode ctx = (ContextNode) context;
    assertThat( ctx.getEntries(), is( empty() ));
}