PortAllocatorTest.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.agent;

import static org.hamcrest.Matchers.allOf;
import static org.hamcrest.Matchers.greaterThanOrEqualTo;
import static org.hamcrest.Matchers.hasEntry;
import static org.hamcrest.Matchers.is;
import static org.hamcrest.Matchers.lessThanOrEqualTo;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertThat;

import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.spotify.helios.common.descriptors.PortMapping;
import java.util.Map;
import java.util.Set;
import org.junit.Test;

public class PortAllocatorTest {

  @Test
  public void testAllocate() throws Exception {
    final PortAllocator sut = new PortAllocator(20000, 20010);
    final Map<String, PortMapping> mapping = ImmutableMap.of("p1", PortMapping.of(17),
                                                             "p2", PortMapping.of(18, 18));
    final Set<Integer> used = ImmutableSet.of(10, 11);
    final Map<String, Integer> allocation = sut.allocate(mapping, used);
    assertThat(allocation, hasEntry(is("p1"),
                                    allOf(greaterThanOrEqualTo(20000), lessThanOrEqualTo(20010))));
    assertThat(allocation, hasEntry("p2", 18));
  }

  @Test
  public void testInsufficientPortsFail1() throws Exception {
    final PortAllocator sut = new PortAllocator(10, 11);
    final Map<String, PortMapping> mapping = ImmutableMap.of("p1", PortMapping.of(17),
                                                             "p2", PortMapping.of(18, 18));
    final Set<Integer> used = ImmutableSet.of(10, 11);
    final Map<String, Integer> allocation = sut.allocate(mapping, used);
    assertNull(allocation);
  }

  @Test
  public void testInsufficientPortsFail2() throws Exception {
    final PortAllocator sut = new PortAllocator(10, 11);
    final Map<String, PortMapping> mapping = ImmutableMap.of("p1", PortMapping.of(1),
                                                             "p2", PortMapping.of(2),
                                                             "p3", PortMapping.of(4),
                                                             "p4", PortMapping.of(18, 18));
    final Set<Integer> used = ImmutableSet.of();
    final Map<String, Integer> allocation = sut.allocate(mapping, used);
    assertNull(allocation);
  }
}