content: /*
   * Copyright 2013-2023 the original author or authors.
   *
   * 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
   *
   *      https://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.alibaba.cloud.nacos;
  
  import java.util.Arrays;
  import java.util.List;
  
  import com.alibaba.cloud.nacos.discovery.NacosDiscoveryClient;
  import com.alibaba.cloud.nacos.discovery.NacosServiceDiscovery;
  import com.alibaba.cloud.nacos.discovery.ServiceCache;
  import com.alibaba.nacos.api.exception.NacosException;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.extension.ExtendWith;
  import org.mockito.InjectMocks;
  import org.mockito.Mock;
  import org.mockito.junit.jupiter.MockitoExtension;
  
  import org.springframework.cloud.client.ServiceInstance;
  import org.springframework.test.util.ReflectionTestUtils;
  
  import static java.util.Collections.emptyList;
  import static java.util.Collections.singletonList;
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.assertj.core.api.Assertions.assertThatThrownBy;
  import static org.mockito.Mockito.when;
  
  /**
   * @author xiaojing
   * @author echooymxq
   * @author freeman
   */
  @ExtendWith(MockitoExtension.class)
  public class NacosDiscoveryClientTests {
  
  	@Mock
  	private NacosServiceDiscovery serviceDiscovery;
  
  	@Mock
  	private NacosServiceInstance serviceInstance;
  
  	@InjectMocks
  	private NacosDiscoveryClient client;
  
  	@Test
  	public void testGetInstances() throws Exception {
  
  		when(serviceDiscovery.getInstances("service-1"))
  				.thenReturn(singletonList(serviceInstance));
  
  		List<ServiceInstance> serviceInstances = client.getInstances("service-1");
  
  		assertThat(serviceInstances).isNotEmpty();
  
  	}
  
  	@Test
  	public void testGetServices() throws Exception {
  
  		when(serviceDiscovery.getServices()).thenReturn(singletonList("service-1"));
  
  		List<String> services = client.getServices();
  
  		assertThat(services).contains("service-1").size().isEqualTo(1);
  
  	}
  
  	@Test
  	public void testGetInstancesFailureToleranceEnabled() throws NacosException {
  		ServiceCache.setInstances("a", singletonList(serviceInstance));
  
  		when(serviceDiscovery.getInstances("a")).thenThrow(new NacosException());
  		ReflectionTestUtils.setField(client, "failureToleranceEnabled", true);
  
  		List<ServiceInstance> instances = this.client.getInstances("a");
  
  		assertThat(instances).isEqualTo(singletonList(serviceInstance));
  	}
  
  	@Test
  	public void testGetInstancesFailureToleranceDisabled() throws NacosException {
  		ServiceCache.setInstances("a", singletonList(serviceInstance));
  
  		when(serviceDiscovery.getInstances("a")).thenThrow(new NacosException());
  		ReflectionTestUtils.setField(client, "failureToleranceEnabled", false);
  
  		assertThatThrownBy(() -> this.client.getInstances("a"));
  	}
  
  	@Test
  	public void testFailureToleranceEnabled() throws NacosException {
  		ServiceCache.setServiceIds(Arrays.asList("a", "b"));
  
  		when(serviceDiscovery.getServices()).thenThrow(new NacosException());
  		ReflectionTestUtils.setField(client, "failureToleranceEnabled", true);
  
  		List<String> services = this.client.getServices();
  
  		assertThat(services).isEqualTo(Arrays.asList("a", "b"));
  	}
  
  	@Test
  	public void testFailureToleranceDisabled() throws NacosException {
  		ServiceCache.setServiceIds(Arrays.asList("a", "b"));
  
  		when(serviceDiscovery.getServices()).thenThrow(new NacosException());
  		ReflectionTestUtils.setField(client, "failureToleranceEnabled", false);
  
  		List<String> services = this.client.getServices();
  
  		assertThat(services).isEqualTo(emptyList());
  	}
  
  	@Test
  	public void testCacheIsOK() throws NacosException {
  		when(serviceDiscovery.getInstances("a"))
  				.thenReturn(singletonList(serviceInstance));
  		this.client.getInstances("a");
  		assertThat(ServiceCache.getInstances("a")).isEqualTo(singletonList(serviceInstance));
  	}
  
  }
  