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/*
 * @test
 * @bug 8371953
 * @summary Basic API null checks for Proxy.
 * @run junit ProxyNullCheckTest
 */

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;

import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.*;

class ProxyNullCheckTest {
    @SuppressWarnings("deprecation")
    @Test
    void nullChecks() throws ReflectiveOperationException {
        InvocationHandler h = (_, _, _) -> null;
        // newProxyInstance
        assertDoesNotThrow(() -> Proxy.newProxyInstance(null, new Class[0], h));
        assertThrows(NullPointerException.class, () -> Proxy.newProxyInstance(null, null, h));
        assertThrows(NullPointerException.class, () -> Proxy.newProxyInstance(null, new Class[] { null }, h));
        assertThrows(NullPointerException.class, () -> Proxy.newProxyInstance(null, new Class[0], null));
        // getProxyClass
        assertDoesNotThrow(() -> Proxy.getProxyClass(null, new Class[0]));
        assertThrows(NullPointerException.class, () -> Proxy.getProxyClass(null, (Class[]) null));
        assertThrows(NullPointerException.class, () -> Proxy.getProxyClass(null, new Class[] { null }));
        // isProxyClass
        assertFalse(Proxy.isProxyClass(Object.class));
        assertThrows(NullPointerException.class, () -> Proxy.isProxyClass(null));
        // getInvocationHandler
        assertThrows(NullPointerException.class, () -> Proxy.getInvocationHandler(null));
        assertThrows(IllegalArgumentException.class, () -> Proxy.getInvocationHandler(42));
    }
}