KafkaClientProviderTest.java example

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/*-
 * -\-\-
 * Helios Services
 * --
 * Copyright (C) 2016 Spotify AB
 * --
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * -/-/-
 */

package com.spotify.helios.servicescommon;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import com.google.common.collect.ImmutableList;
import java.util.Optional;
import org.junit.Test;

public class KafkaClientProviderTest {

  @Test
  public void testNoBrokersConfigured() {
    final KafkaClientProvider provider = new KafkaClientProvider(null);

    assertEquals("KafkaClientProvider should return absent when null list of seed hosts is passed",
        Optional.empty(), provider.getDefaultProducer());
  }

  @Test
  public void testReturnsProvider() {
    // the actual host:port used in the test does not need to be an actual Kafka server
    final ImmutableList<String> hosts = ImmutableList.of("localhost:2181");
    final KafkaClientProvider provider = new KafkaClientProvider(hosts);

    assertTrue("Expected KafkaProvider to return non-absent KafkaProducer "
               + "when passed a list of seed hosts",
        provider.getDefaultProducer().isPresent());
  }
}