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package com.oracle.truffle.sl.test;

import com.oracle.truffle.api.interop.TruffleObject;
import com.oracle.truffle.api.interop.java.JavaInterop;
import com.oracle.truffle.api.source.Source;
import com.oracle.truffle.api.vm.PolyglotEngine;
import java.io.ByteArrayOutputStream;
import static org.junit.Assert.assertEquals;
import org.junit.Test;

public class SLJavaInteropTest {
    @Test
    public void asFunction() throws Exception {
        String scriptText = "function main() {\n" + "    println(\"Called!\");\n" + "}\n";
        Source script = Source.fromText(scriptText, "Test").withMimeType("application/x-sl");
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        PolyglotEngine engine = PolyglotEngine.buildNew().setOut(os).build();
        engine.eval(script);
        PolyglotEngine.Value main = engine.findGlobalSymbol("main");
        Runnable runnable = JavaInterop.asJavaFunction(Runnable.class, (TruffleObject) main.get());
        runnable.run();

        assertEquals("Called!\n", os.toString("UTF-8"));
    }
}