Fixed integration tests to use ZipkinRule

Introduce assertj assertions (#315)

    * Introduce assertJ assertions in some tests
    * Fix code formatting to be inline with Spring rules

spring-cloud-sleuth-samples/spring-cloud-sleuth-sample-zipkin/src/test/java/integration/ZipkinTests.java

@@ -18,9 +18,7 @@ package integration;
 import java.net.URI;
 import java.util.Random;
 
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
-import org.junit.Before;
+import org.junit.ClassRule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -29,20 +27,17 @@ import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.test.SpringApplicationConfiguration;
 import org.springframework.boot.test.WebIntegrationTest;
-import org.springframework.cloud.sleuth.metric.SpanMetricReporter;
-import org.springframework.cloud.sleuth.zipkin.HttpZipkinSpanReporter;
 import org.springframework.cloud.sleuth.zipkin.ZipkinProperties;
-import org.springframework.cloud.sleuth.zipkin.ZipkinSpanReporter;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Primary;
 import org.springframework.test.context.TestPropertySource;
 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
-import org.springframework.util.SocketUtils;
 
 import integration.ZipkinTests.WaitUntilZipkinIsUpConfig;
 import sample.SampleZipkinApplication;
 import tools.AbstractIntegrationTest;
+import zipkin.junit.ZipkinRule;
 import zipkin.server.EnableZipkinServer;
 
 @RunWith(SpringJUnit4ClassRunner.class)
@@ -52,18 +47,14 @@ import zipkin.server.EnableZipkinServer;
 @TestPropertySource(properties = {"sample.zipkin.enabled=true"})
 public class ZipkinTests extends AbstractIntegrationTest {
 
+	@ClassRule public static final ZipkinRule zipkin = new ZipkinRule();
+
 	private static final String APP_NAME = "testsleuthzipkin";
 	@Value("${local.server.port}")
 	private int port = 3380;
 	private String sampleAppUrl = "http://localhost:" + this.port;
 	@Autowired ZipkinProperties zipkinProperties;
 
-	@Before
-	public void setup() {
-		ZipkinServer.main(new String[] { "--server.port=" + getPortFromProps() });
-		await().until(zipkinQueryServerIsUp());
-	}
-
 	@Override protected int getZipkinServerPort() {
 		return getPortFromProps();
 	}
@@ -90,42 +81,13 @@ public class ZipkinTests extends AbstractIntegrationTest {
 	@Configuration
 	public static class WaitUntilZipkinIsUpConfig {
 
-		private static final Log log = LogFactory.getLog(WaitUntilZipkinIsUpConfig.class);
-
 		@Bean
 		@Primary
 		ZipkinProperties testZipkinProperties() {
-			int freePort = SocketUtils.findAvailableTcpPort();
 			ZipkinProperties zipkinProperties = new ZipkinProperties();
-			zipkinProperties.setBaseUrl("http://localhost:" + freePort);
+			zipkinProperties.setBaseUrl(zipkin.httpUrl());
 			return zipkinProperties;
 		}
-
-		@Bean
-		public ZipkinSpanReporter spanCollector(final ZipkinProperties zipkin,
-				final SpanMetricReporter spanMetricReporter) {
-			await().until(new Runnable() {
-				@Override
-				public void run() {
-					try {
-						WaitUntilZipkinIsUpConfig.this.getSpanCollector(zipkin,
-								spanMetricReporter);
-					}
-					catch (Exception e) {
-						log.error("Exception occurred while trying to connect to zipkin ["
-								+ e.getCause() + "]");
-						throw new AssertionError(e);
-					}
-				}
-			});
-			return getSpanCollector(zipkin, spanMetricReporter);
-		}
-
-		private ZipkinSpanReporter getSpanCollector(ZipkinProperties zipkin,
-				SpanMetricReporter spanMetricReporter) {
-			return new HttpZipkinSpanReporter(zipkin.getBaseUrl(), zipkin.getFlushInterval(),
-					zipkin.getCompression().isEnabled(), spanMetricReporter);
-		}
 	}
 
 	@SpringBootApplication