test/src/jdk/nashorn/internal/runtime/test/JDK_8078414_Test.java

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 * accompanied this code).
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package jdk.nashorn.internal.runtime.test;

import static org.testng.Assert.assertFalse;
import static org.testng.Assert.assertTrue;

import java.util.Map;
import javax.script.Bindings;
import jdk.nashorn.api.scripting.JSObject;
import jdk.nashorn.api.scripting.ScriptObjectMirror;
import jdk.nashorn.internal.objects.NativeArray;
import jdk.nashorn.internal.runtime.ScriptObject;
import jdk.nashorn.internal.runtime.linker.Bootstrap;
import org.testng.annotations.Test;

/**
 * @test
 * @bug 8078414
 * @summary Test that arbitrary classes can't be converted to mirror's superclasses/interfaces.
 * @run testng jdk.nashorn.internal.runtime.test.JDK_8078414_Test
 */
public class JDK_8078414_Test {
    @Test
    public void testCanNotConvertArbitraryClassToMirror() {
        assertCanNotConvert(Double.class, Map.class);
        assertCanNotConvert(Double.class, Bindings.class);
        assertCanNotConvert(Double.class, JSObject.class);
        assertCanNotConvert(Double.class, ScriptObjectMirror.class);
    }

    @Test
    public void testCanConvertObjectToMirror() {
        assertCanConvertToMirror(Object.class);
    }

    @Test
    public void testCanConvertScriptObjectToMirror() {
        assertCanConvertToMirror(ScriptObject.class);
    }

    @Test
    public void testCanConvertScriptObjectSubclassToMirror() {
        assertCanConvertToMirror(NativeArray.class);
    }

    @Test
    public void testCanConvertArbitraryInterfaceToMirror() {
        // We allow arbitrary interface classes, depending on what implements them, to end up being
        // convertible to ScriptObjectMirror, as an implementation can theoretically pass an
        // "instanceof ScriptObject" guard.
        assertCanConvertToMirror(TestInterface.class);
    }

    public static interface TestInterface {
    }

    private static boolean canConvert(final Class<?> from, final Class<?> to) {
        return Bootstrap.getLinkerServices().canConvert(from, to);
    }

    private static void assertCanConvert(final Class<?> from, final Class<?> to) {
        assertTrue(canConvert(from, to));
    }

    private static void assertCanNotConvert(final Class<?> from, final Class<?> to) {
        assertFalse(canConvert(from, to));
    }

    private static void assertCanConvertToMirror(final Class<?> from) {
        assertCanConvert(from, Map.class);
        assertCanConvert(from, Bindings.class);
        assertCanConvert(from, JSObject.class);
        assertCanConvert(from, ScriptObjectMirror.class);
    }
}