fixed or added SpringContextIntegrationTests for spring cloud submodules:

spring-cloud-functions
spring-cloud-kubernetes/travel-agency-service
spring-cloud-openfeign
spring-cloud-task/springcloudtaskbatch
spring-cloud-vault
spring-cloud-zookeeper/HelloWorld
spring-cloud-zuul

spring-cloud/spring-cloud-functions/src/test/java/com/baeldung/spring/cloudfunction/aws/SpringContextIntegrationTest.java

@@ -0,0 +1,15 @@
+package com.baeldung.spring.cloudfunction.aws;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes = CloudFunctionAwsApplication.class)
+public class SpringContextIntegrationTest {
+    
+    @Test
+    public void whenSpringContextIsBootstrapped_thenNoExceptions() {
+    }
+}