httpclient5/src/test/java/org/apache/hc/client5/http/SystemDefaultDnsResolverTest.java

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package org.apache.hc.client5.http;

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

import java.net.InetAddress;
import java.net.UnknownHostException;

import org.junit.jupiter.api.Test;

public class SystemDefaultDnsResolverTest {

    @Test
    void resolve() throws UnknownHostException {
        final SystemDefaultDnsResolver resolver = SystemDefaultDnsResolver.INSTANCE;
        final InetAddress[] result1 = resolver.resolve("127.0.0.1");
        assertEquals(1, result1.length);
        assertArrayEquals(new byte[]{127, 0, 0, 1}, result1[0].getAddress());
    }

    @Test
    void resolveIPv6ZoneId() throws UnknownHostException {
        final SystemDefaultDnsResolver resolver = SystemDefaultDnsResolver.INSTANCE;

        // This is an IPv6 address literal with zone ID
        final InetAddress[] result = resolver.resolve("[fe80::221:b7ff:fe8a:57d5%en4]");
        assertEquals(1, result.length);
        assertArrayEquals(new byte[]{(byte) 0xfe, (byte) 0x80, 0, 0, 0, 0, 0, 0, 0x02, 0x21, (byte) 0xb7, (byte) 0xff, (byte) 0xfe, (byte) 0x8a, 0x57, (byte) 0xd5}, result[0].getAddress());

    }

}