MetricTest.java

/**
 * Copyright 2013 Netflix, Inc.
 * <p/>
 * 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
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * 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.netflix.servo;

import com.netflix.servo.monitor.MonitorConfig;
import com.netflix.servo.tag.SortedTagList;
import com.netflix.servo.tag.TagList;
import org.testng.annotations.Test;

import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertFalse;
import static org.testng.Assert.assertNotNull;
import static org.testng.Assert.assertTrue;

public class MetricTest {

  private final TagList tags1 = SortedTagList.builder().withTag("cluster", "foo")
      .withTag("asg", "foo-v000").build();

  private final TagList tags2 = SortedTagList.builder().withTag("cluster", "foo")
      .withTag("asg", "foo-v001").build();

  @Test(expectedExceptions = NullPointerException.class)
  public void testNullName() throws Exception {
    long now = System.currentTimeMillis();
    new Metric(null, tags1, now, 42);
  }

  @Test
  public void testNullTags() throws Exception {
    long now = System.currentTimeMillis();
    Metric m = new Metric("a", null, now, 42);
    assertEquals(m.getConfig(), new MonitorConfig.Builder("a").build());
  }

  @Test(expectedExceptions = NullPointerException.class)
  public void testNullValue() throws Exception {
    long now = System.currentTimeMillis();
    new Metric("a", tags1, now, null);
  }

  @Test
  public void testAccessors() throws Exception {
    long now = System.currentTimeMillis();
    Metric m1 = new Metric("a", tags1, now, 42);
    assertEquals(m1.getConfig(), new MonitorConfig.Builder("a").withTags(tags1).build());
    assertEquals(m1.getTimestamp(), now);
    assertEquals(m1.getValue(), 42);
  }

  @Test
  public void testEquals() throws Exception {
    long now = System.currentTimeMillis();
    Metric m1 = new Metric("a", tags1, now, 42);
    Metric m2 = new Metric("a", tags2, now, 42);
    Metric m3 = new Metric("a", tags1, now, 42);

    assertNotNull(m1);
    assertFalse(m1.toString().equals(m2.toString()));
    assertTrue(m1.equals(m1));
    assertFalse(m1.equals(m2));
    assertTrue(m1.equals(m3));
  }

  @Test
  public void testHashCode() throws Exception {
    long now = System.currentTimeMillis();
    Metric m1 = new Metric("a", tags1, now, 42);
    Metric m2 = new Metric("a", tags2, now, 42);
    Metric m3 = new Metric("a", tags1, now, 42);

    assertTrue(m1.hashCode() == m1.hashCode());
    assertTrue(m1.hashCode() != m2.hashCode());
    assertTrue(m1.hashCode() == m3.hashCode());
  }
}