ActionParser { public GrammarRuleKey rootRule() { return rootRule; } ActionParser(Charset charset, LexerlessGrammarBuilder b, Class grammarClass, Object treeFactory, NodeBuilder nodeBuilder, GrammarRuleKey rootRule); N parse(File file); N parse(String source); GrammarRuleKey rootRule();  }
@Test public void rootRule() throws Exception { assertThat(parser(MyGrammarKeys.OPERATOR).rootRule()).isEqualTo(MyGrammarKeys.OPERATOR); }