public ParseTree getRootNode() {
        return parseTree.getChild(0);
    }
@Test
    void assertGetRootNode() {
        ParseTree parseTree = mock(ParseTree.class);
        when(parseTree.getChild(0)).thenReturn(parseTree);
        assertThat(new ParseASTNode(parseTree, mock(CommonTokenStream.class)).getRootNode(), is(parseTree));
    }