Fixed the broken test

extremely interesting case of Ribbon not being able to refresh the list of servers since the default interval is set to 30 seconds. By overriding that default to 100 ms the test passes again

spring-cloud-zookeeper-discovery/src/test/groovy/org/springframework/cloud/zookeeper/discovery/dependency/ZookeeperDiscoveryWithDyingDependenciesISpec.groovy

@@ -19,6 +19,7 @@ import org.apache.curator.test.TestingServer
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration
 import org.springframework.boot.builder.SpringApplicationBuilder
 import org.springframework.cloud.client.discovery.EnableDiscoveryClient
+import org.springframework.cloud.zookeeper.discovery.PollingUtils
 import org.springframework.cloud.zookeeper.discovery.test.TestRibbonClient
 import org.springframework.context.ApplicationContext
 import org.springframework.context.ConfigurableApplicationContext
@@ -27,9 +28,12 @@ import org.springframework.context.annotation.Import
 import org.springframework.util.SocketUtils
 import spock.lang.Issue
 import spock.lang.Specification
+import spock.util.concurrent.PollingConditions
 import spock.util.environment.RestoreSystemProperties
 
-class ZookeeperDiscoveryWithDyingDependenciesISpec extends Specification {
+class ZookeeperDiscoveryWithDyingDependenciesISpec extends Specification implements PollingUtils {
+
+	PollingConditions pollingConditions = new PollingConditions()
 
 	@Issue("#45")
 	@RestoreSystemProperties
@@ -43,11 +47,14 @@ class ZookeeperDiscoveryWithDyingDependenciesISpec extends Specification {
 			ConfigurableApplicationContext serverContext = contextWithProfile('server')
 			ConfigurableApplicationContext clientContext = contextWithProfile('client')
 		and:
-			Integer portBeforeDying = callServiceAtPortEndpoint(clientContext)
+			Integer serverPortBeforeDying = callServiceAtPortEndpoint(clientContext)
 		and:
 			serverContext = restartContext(serverContext, 'server')
 		expect:
-			callServiceAtPortEndpoint(clientContext) != portBeforeDying
+			pollingConditions.within 5, willPass {
+				assert callServiceAtPortEndpoint(clientContext) != serverPortBeforeDying
+			}
+
 		cleanup:
 			serverContext?.close()
 			clientContext?.close()

spring-cloud-zookeeper-discovery/src/test/groovy/org/springframework/cloud/zookeeper/discovery/test/TestServiceRestClient.groovy

@@ -16,9 +16,11 @@
 package org.springframework.cloud.zookeeper.discovery.test
 
 import groovy.transform.CompileStatic
+import groovy.util.logging.Commons
 import org.springframework.web.client.RestTemplate
 
 @CompileStatic
+@Commons
 class TestServiceRestClient {
 
 	final RestTemplate restTemplate;
@@ -28,7 +30,9 @@ class TestServiceRestClient {
 	}
 
 	public <T> T callService(String alias, String endpoint, Class<T> clazz) {
-		return restTemplate.getForObject("http://$alias/$endpoint", clazz)
+		String url = "http://$alias/$endpoint"
+		log.info("Calling [$url]")
+		return restTemplate.getForObject(url, clazz)
 	}
 
 	String callService(String alias, String endpoint) {

spring-cloud-zookeeper-discovery/src/test/resources/application.yml

@@ -0,0 +1 @@
+testInstance.ribbon.ServerListRefreshInterval: 100