GH-422 Improvements in cloud event samples

Added initial README
Polished tests

spring-cloud-function-samples/function-sample-cloudevent/src/test/java/io/spring/cloudevent/CloudeventDemoApplicationRESTTests.java

@@ -47,7 +47,7 @@ import org.springframework.util.SocketUtils;
  * @author Oleg Zhurakousky
  *
  */
-public class CloudeventDemoApplicationTests {
+public class CloudeventDemoApplicationRESTTests {
 
 	private TestRestTemplate testRestTemplate = new TestRestTemplate();
 
@@ -167,6 +167,37 @@ public class CloudeventDemoApplicationTests {
 		assertThat(response.getBody()).isEqualTo("releaseDate:24-03-2004; releaseName:Spring Framework; version:1.0");
     }
 
+	@Test
+    public void testAsStracturalFormatToString() throws Exception {
+        SpringApplication.run(CloudeventDemoApplication.class);
+
+        String payload = "{\n" +
+                "    \"specversion\" : \"1.0\",\n" +
+                "    \"type\" : \"org.springframework\",\n" +
+                "    \"source\" : \"https://spring.io/\",\n" +
+                "    \"id\" : \"A234-1234-1234\",\n" +
+                "    \"datacontenttype\" : \"application/json\",\n" +
+                "    \"data\" : {\n" +
+                "        \"version\" : \"1.0\",\n" +
+                "        \"releaseName\" : \"Spring Framework\",\n" +
+                "        \"releaseDate\" : \"24-03-2004\"\n" +
+                "    }\n" +
+                "}";
+
+        HttpHeaders headers = new HttpHeaders();
+        headers.setContentType(MediaType.valueOf("application/cloudevents+json;charset=utf-8"));
+
+        RequestEntity<String> re = new RequestEntity<>(payload, headers, HttpMethod.POST, this.constructURI("/asStringMessage"));
+        ResponseEntity<String> response = testRestTemplate.exchange(re, String.class);
+
+        assertThat(response.getBody()).isEqualTo(payload);
+
+        re = new RequestEntity<>(payload, headers, HttpMethod.POST, this.constructURI("/asString"));
+		response = testRestTemplate.exchange(re, String.class);
+
+		assertThat(response.getBody()).isEqualTo(payload);
+    }
+
 
 	@Configuration
 	public static class FooBarConverterConfiguration {

spring-cloud-function-samples/function-sample-cloudevent/src/test/java/io/spring/cloudevent/CloudeventDemoApplicationStreamTests.java

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2020-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.spring.cloudevent;
+
+/**
+ *
+ * @author Oleg Zhurakousky
+ *
+ */
+public class CloudeventDemoApplicationStreamTests {
+
+
+}