add tests for sample app functions

spring-cloud-function-samples/spring-cloud-function-sample/pom.xml

@@ -38,6 +38,11 @@
 			<artifactId>spring-boot-configuration-processor</artifactId>
 			<optional>true</optional>
 		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
 	</dependencies>
 
 	<dependencyManagement>