| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.hadoop.hbase.metrics; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertNotEquals; |
| import static org.mockito.Mockito.mock; |
| |
| import org.apache.hadoop.hbase.HBaseClassTestRule; |
| import org.apache.hadoop.hbase.testclassification.SmallTests; |
| import org.junit.ClassRule; |
| import org.junit.Test; |
| import org.junit.experimental.categories.Category; |
| |
| import org.apache.hbase.thirdparty.com.google.common.collect.Lists; |
| |
| /** |
| * Test class for {@link MetricRegistriesLoader}. |
| */ |
| @Category(SmallTests.class) |
| public class TestMetricRegistriesLoader { |
| |
| @ClassRule |
| public static final HBaseClassTestRule CLASS_RULE = |
| HBaseClassTestRule.forClass(TestMetricRegistriesLoader.class); |
| |
| @Test |
| public void testLoadSinleInstance() { |
| MetricRegistries loader = mock(MetricRegistries.class); |
| MetricRegistries instance = MetricRegistriesLoader.load(Lists.newArrayList(loader)); |
| assertEquals(loader, instance); |
| } |
| |
| @Test |
| public void testLoadMultipleInstances() { |
| MetricRegistries loader1 = mock(MetricRegistries.class); |
| MetricRegistries loader2 = mock(MetricRegistries.class); |
| MetricRegistries loader3 = mock(MetricRegistries.class); |
| MetricRegistries instance = MetricRegistriesLoader.load(Lists.newArrayList(loader1, loader2, |
| loader3)); |
| |
| // the load() returns the first instance |
| assertEquals(loader1, instance); |
| assertNotEquals(loader2, instance); |
| assertNotEquals(loader3, instance); |
| } |
| } |