test/jdk/java/lang/invoke/findVirtual/FindVirtualArrayCloneTest.java

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/*
 * @test
 * @bug 8299505
 * @run junit FindVirtualArrayCloneTest
 * @summary Test invocation of Object.clone for arrays
 */

import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.ValueSource;

import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;

import static org.junit.jupiter.api.Assertions.assertSame;
import static org.junit.jupiter.api.Assertions.assertArrayEquals;

public class FindVirtualArrayCloneTest {

    /**
     * array clone should be bound to the array class (public)
     */
    @ValueSource(classes = {Object[].class, int[].class, long[].class, byte[].class, double[].class})
    @ParameterizedTest
    public void checkArrayCloneReceiver(Class<?> arrayClass) throws Throwable {
        var lookup = MethodHandles.lookup();
        var cloneMh = lookup.findVirtual(arrayClass, "clone", MethodType.methodType(Object.class));
        assertSame(arrayClass, cloneMh.type().parameterType(0));
    }

    /**
     * Object.clone should be bound to the lookup class (protected)
     */
    @Test
    public void checkProtectedCloneReceiver() throws Throwable {
        var lookup = MethodHandles.lookup();
        var cloneMh = lookup.findVirtual(Object.class, "clone", MethodType.methodType(Object.class));
        assertSame(lookup.lookupClass(), cloneMh.type().parameterType(0));
    }

    @Test
    public void checkArrayClone() throws Throwable {
        var array = new String[] {"apple", "pear", "banana"};
        var regularClone = array.clone();
        var cloneMh = MethodHandles.lookup()
                .findVirtual(String[].class, "clone", MethodType.methodType(Object.class))
                .asType(MethodType.methodType(String[].class, String[].class));
        var mhClone = (String[]) cloneMh.invokeExact((String[]) array);
        assertArrayEquals(array, mhClone);
        assertArrayEquals(regularClone, mhClone);
    }
}