import static org.junit.Assert.*;
import org.antlr.runtime.CommonTokenStream;
import org.antlr.runtime.ANTLRStringStream;
public class GrammarTest {
    @Test
    public void canUseGeneratedGrammar() throws Exception {
        ANTLRStringStream in = new ANTLRStringStream("1+2");
        CalculatorLexer lexer = new CalculatorLexer(in);
        CommonTokenStream tokens = new CommonTokenStream(lexer);

import static org.junit.Assert.*;
import org.antlr.runtime.CommonTokenStream;
import org.antlr.runtime.ANTLRStringStream;
public class GrammarTest {
    @Test
    public void canUseGeneratedGrammar() throws Exception {
        ANTLRStringStream in = new ANTLRStringStream("1+2");
        CalculatorLexer lexer = new CalculatorLexer(in);
        CommonTokenStream tokens = new CommonTokenStream(lexer);

                    TestLexer lexer = new TestLexer(new ANTLRFileStream(args[0]));
                    CommonTokenStream tokens = new CommonTokenStream(lexer);
                    TestParser parser = new TestParser(tokens);
                    try {
                        parser.list();
                    } catch (RecognitionException e)  {
                        e.printStackTrace();
                    }

        assertAntlrVersion(4)
    }

    void goodProgram() {
        file("grammar-user/src/main/java/Main.java") << """

        import org.antlr.v4.runtime.ANTLRInputStream;
        import org.antlr.v4.runtime.CommonTokenStream;
        import java.io.IOException;
        import java.io.StringReader;
        import org.acme.TestLexer;
        import org.acme.TestParser;

        public class Main {