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

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
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 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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import java.net.InetAddress;
import java.net.UnknownHostException;

import impl.ThrowingLookupsProviderImpl;

import static impl.ThrowingLookupsProviderImpl.RUNTIME_EXCEPTION_MESSAGE;

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

/*
 * @test
 * @summary Test that only UnknownHostException is thrown if resolver
 * implementation throws RuntimeException during forward or reverse lookup.
 * @library providers/throwing
 * @build throwing.lookups.provider/impl.ThrowingLookupsProviderImpl
 * @run testng/othervm ResolutionWithExceptionTest
 */

public class ResolutionWithExceptionTest {

    @Test
    public void getByNameUnknownHostException() {
        ThrowingLookupsProviderImpl.throwRuntimeException = false;
        runGetByNameTest();
    }

    @Test
    public void getByNameRuntimeException() {
        ThrowingLookupsProviderImpl.throwRuntimeException = true;
        runGetByNameTest();
    }

    @Test
    public void getByAddressUnknownHostException() throws UnknownHostException {
        ThrowingLookupsProviderImpl.throwRuntimeException = false;
        runGetByAddressTest();
    }

    @Test
    public void getByAddressRuntimeException() throws UnknownHostException {
        ThrowingLookupsProviderImpl.throwRuntimeException = true;
        runGetByAddressTest();
    }

    private void runGetByNameTest() {
        // InetAddress.getByName() is expected to throw UnknownHostException in all cases
        UnknownHostException uhe = Assert.expectThrows(UnknownHostException.class,
                () -> InetAddress.getByName("doesnt.matter.com"));
        // If provider is expected to throw RuntimeException - check that UnknownHostException
        // is set as its cause
        if (ThrowingLookupsProviderImpl.throwRuntimeException) {
            Throwable cause = uhe.getCause();
            if (cause instanceof RuntimeException re) {
                // Check RuntimeException message
                Assert.assertEquals(re.getMessage(), RUNTIME_EXCEPTION_MESSAGE,
                        "incorrect exception message");
            } else {
                Assert.fail("UnknownHostException cause is not RuntimeException");
            }
        }
    }

    private void runGetByAddressTest() throws UnknownHostException {
        // getCanonicalHostName is not expected to throw an exception:
        // if there is an error during reverse lookup operation the literal IP
        // address String will be returned.
        String literalIP = InetAddress.getByAddress(new byte[]{1, 2, 3, 4}).getCanonicalHostName();
        Assert.assertEquals(literalIP, "1.2.3.4");
    }
}