DynamicServiceInstanceProviderUnitTests.java

/*
 * Copyright 2012-present 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 org.springframework.cloud.client.hypermedia;

import java.util.Arrays;

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.Mock;
import org.mockito.junit.jupiter.MockitoExtension;

import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;

import static org.assertj.core.api.BDDAssertions.then;
import static org.mockito.ArgumentMatchers.anyString;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

/**
 * @author Oliver Gierke
 */
@ExtendWith(MockitoExtension.class)
public class DynamicServiceInstanceProviderUnitTests {

	@Mock
	DiscoveryClient client;

	@Test
	public void returnsNoServiceInCaseNoneIsAvailable() {
		then(new DynamicServiceInstanceProvider(this.client, "service").getServiceInstance()).isNull();
	}

	@Test
	public void returnsFirstServiceInCaseMultipleOnesAreAvailable() {

		ServiceInstance first = mock(ServiceInstance.class);
		ServiceInstance second = mock(ServiceInstance.class);

		when(this.client.getInstances(anyString())).thenReturn(Arrays.asList(first, second));

		then(new DynamicServiceInstanceProvider(this.client, "service").getServiceInstance()).isEqualTo(first);
	}

}