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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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package com.oracle.truffle.js.test.instrumentation;

import com.oracle.truffle.api.instrumentation.LoadSourceEvent;
import com.oracle.truffle.api.instrumentation.LoadSourceListener;
import com.oracle.truffle.api.instrumentation.SourceFilter;
import com.oracle.truffle.api.instrumentation.TruffleInstrument;
import com.oracle.truffle.js.lang.JavaScriptLanguage;
import org.graalvm.polyglot.Context;
import org.junit.Assert;
import org.junit.Test;

public class GR18957 {

    @Test
    public void testIt() throws InterruptedException {
        final Context context = TestUtil.newContextBuilder().build();
        context.eval(JavaScriptLanguage.ID, "typeof abc === 'undefined'");
        // Verify that the materialization of JSTypeofIdenticalNode does not
        // throw when it is triggered without an entered context.
        final boolean[] passed = new boolean[1];
        Thread t = new Thread(new Runnable() {
            @Override
            public void run() {
                context.getEngine().getInstruments().get(GR18957Instrument.ID).lookup(GR18957Instrument.class);
                passed[0] = true; // Invoked when no exception is thrown only
            }
        });
        t.start();
        t.join();
        Assert.assertTrue(passed[0]);
    }

    @TruffleInstrument.Registration(id = GR18957Instrument.ID, services = {GR18957Instrument.class})
    public static class GR18957Instrument extends TruffleInstrument {
        public static final String ID = "GR18957Instrument";

        @Override
        protected void onCreate(Env env) {
            env.registerService(this);
            env.getInstrumenter().attachLoadSourceListener(SourceFilter.ANY, new LoadSourceListener() {
                @Override
                public void onLoad(LoadSourceEvent event) {
                    // no action needed
                }
            }, true);
        }
    }
}