test/jdk/java/net/spi/InetAddressResolverProvider/ProviderGetExceptionTest.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 2 along with this work; if not, write to the Free Software Foundation,
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import java.net.InetAddress;
import java.util.Arrays;

import org.testng.Assert;
import org.testng.annotations.Test;

import static impl.FaultyResolverProviderGetImpl.EXCEPTION_MESSAGE;

/*
 * @test
 * @summary Test that InetAddress fast-fails if custom provider fails to
 *  instantiate a resolver.
 * @library providers/faulty
 * @build faulty.provider/impl.FaultyResolverProviderGetImpl
 * @run testng/othervm ProviderGetExceptionTest
 */

public class ProviderGetExceptionTest {

    @Test
    public void getByNameExceptionTest() {
        String hostName = "test.host";
        System.out.println("Looking up address for the following host name:" + hostName);
        callInetAddressAndCheckException(() -> InetAddress.getByName(hostName));
    }

    @Test
    public void getByAddressExceptionTest() {
        byte[] address = new byte[]{1, 2, 3, 4};
        System.out.println("Looking up host name for the following address:" + Arrays.toString(address));
        callInetAddressAndCheckException(() -> InetAddress.getByAddress(address).getHostName());
    }

    private void callInetAddressAndCheckException(Assert.ThrowingRunnable apiCall) {
        IllegalArgumentException iae = Assert.expectThrows(IllegalArgumentException.class, apiCall);
        System.out.println("Got exception of expected type:" + iae);
        Assert.assertNull(iae.getCause(), "cause is not null");
        Assert.assertEquals(iae.getMessage(), EXCEPTION_MESSAGE);
    }
}