Added some additional tests

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/EurekaClientAutoConfiguration.java

@@ -113,7 +113,7 @@ public class EurekaClientAutoConfiguration {
 		EurekaInstanceConfigBean instance = new EurekaInstanceConfigBean(inetUtils);
 		instance.setNonSecurePort(this.nonSecurePort);
 		instance.setInstanceId(getDefaultInstanceId(this.env));
-		if(springAppName != null) {
+		if(StringUtils.hasText(springAppName)) {
 			instance.setAppname(springAppName);
 			instance.setVirtualHostName(springAppName);
 			instance.setSecureVirtualHostName(springAppName);

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/EurekaClientAutoConfigurationTests.java

@@ -189,6 +189,23 @@ public class EurekaClientAutoConfigurationTests {
 		// Mockito.verify(http).addFilter(Matchers.any(HTTPBasicAuthFilter.class));
 	}
 
+	@Test
+	public void testDefaultAppName() throws Exception {
+		setupContext();
+		assertEquals("unknown", getInstanceConfig().getAppname());
+		assertEquals("unknown", getInstanceConfig().getVirtualHostName());
+		assertEquals("unknown", getInstanceConfig().getSecureVirtualHostName());
+	}
+
+	@Test
+	public void testAppName() throws Exception {
+		EnvironmentTestUtils.addEnvironment(this.context, "spring.application.name=mytest");
+		setupContext();
+		assertEquals("mytest", getInstanceConfig().getAppname());
+		assertEquals("mytest", getInstanceConfig().getVirtualHostName());
+		assertEquals("mytest", getInstanceConfig().getSecureVirtualHostName());
+	}
+
 	private void testNonSecurePort(String propName) {
 		addEnvironment(this.context, propName + ":8888");
 		setupContext();

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/EurekaInstanceConfigBeanTests.java

@@ -31,6 +31,7 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.env.ConfigurableEnvironment;
 import org.springframework.test.util.ReflectionTestUtils;
+import org.springframework.util.StringUtils;
 import com.netflix.appinfo.InstanceInfo.InstanceStatus;
 
 import static org.junit.Assert.assertEquals;
@@ -216,7 +217,7 @@ public class EurekaInstanceConfigBeanTests {
 			EurekaInstanceConfigBean configBean = new EurekaInstanceConfigBean(new InetUtils(new InetUtilsProperties()));
 			RelaxedPropertyResolver springPropertyResolver = new RelaxedPropertyResolver(env, "spring.application.");
 			String springAppName = springPropertyResolver.getProperty("name");
-			if(springAppName != null) {
+			if(StringUtils.hasText(springAppName)) {
 				configBean.setSecureVirtualHostName(springAppName);
 				configBean.setVirtualHostName(springAppName);
 				configBean.setAppname(springAppName);