server/dns-service/dnsservice-test/src/main/java/org/apache/james/dnsservice/api/AbstractDNSServiceTest.java

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package org.apache.james.dnsservice.api;

import static org.assertj.core.api.Assertions.assertThat;

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Collection;

import org.apache.james.dnsservice.api.mock.MockDNSService;
import org.junit.Ignore;
import org.junit.Test;

import com.google.common.collect.ImmutableList;


/**
 * Basic tests for AbstractDNSServer. The goal is to verify that the interface
 * remains constants and that the built platform has access to the Internet.
 */
public class AbstractDNSServiceTest {

    /**
     * Simple Mock DNSService relaying on InetAddress.
     */
    private static final DNSService DNS_SERVER = new MockDNSService() {

        @Override
        public String getHostName(InetAddress inet) {
            return inet.getCanonicalHostName();
        }

        @Override
        public Collection<InetAddress> getAllByName(String name) throws UnknownHostException {
            return ImmutableList.copyOf(InetAddress.getAllByName(name));
        }

        @Override
        public InetAddress getLocalHost() throws UnknownHostException {
            return InetAddress.getLocalHost();
        }

        @Override
        public InetAddress getByName(String host) throws UnknownHostException {
            return InetAddress.getByName(host);
        }
    };

    /**
     * Simple localhost resolution.
     *
     * @throws UnknownHostException
     */
    @Test
    public void testLocalhost() throws UnknownHostException {

        assertThat(DNS_SERVER.getByName("localhost").toString()).isEqualTo("localhost/127.0.0.1");

        String localHost = DNS_SERVER.getHostName(InetAddress.getByName("127.0.0.1"));
        // We only can check if the returned localhost is not empty. Its value
        // depends on the hosts file.
        assertThat(localHost.length() > 0).isTrue();
    }

    /**
     * Simple apache.org resolution.
     *
     * @throws UnknownHostException
     */
    @Test
    @Ignore(value = "It requires internet connection!")
    public void testApache() throws UnknownHostException {
        //TODO: move to some sort of Live tests
        assertThat(DNS_SERVER.getByName("www.apache.org").toString().startsWith("www.apache.org")).isTrue();
    }
}