Add support for Function<Message,Message> in lite server

Fixes gh-221

spring-cloud-function-web/src/test/java/org/springframework/cloud/function/test/HeadersToMessageTests.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright 2018 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
+ *
+ *      http://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 org.springframework.cloud.function.test;
+
+import java.util.function.Function;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.SpringBootConfiguration;
+import org.springframework.boot.test.autoconfigure.web.reactive.AutoConfigureWebTestClient;
+import org.springframework.cloud.function.context.test.FunctionalSpringBootTest;
+import org.springframework.messaging.Message;
+import org.springframework.messaging.support.MessageBuilder;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.web.reactive.server.WebTestClient;
+
+import reactor.core.publisher.Mono;
+
+/**
+ *
+ * @author Oleg Zhurakousky
+ *
+ */
+@RunWith(SpringRunner.class)
+@FunctionalSpringBootTest
+@AutoConfigureWebTestClient
+public class HeadersToMessageTests {
+
+	@Autowired
+	private WebTestClient client;
+
+	@Test
+	public void testBodyAndCustomHeaderFromMessagePropagation() throws Exception {
+		client.post().uri("/").body(Mono.just("foo"), String.class).exchange()
+				.expectStatus().isOk().expectHeader()
+				.valueEquals("x-content-type", "application/xml").expectHeader()
+				.valueEquals("foo", "bar").expectBody(String.class).isEqualTo("FOO");
+	}
+
+	@SpringBootConfiguration
+	protected static class TestConfiguration
+			implements Function<Message<String>, Message<String>> {
+		public Message<String> apply(Message<String> request) {
+			Message<String> message = MessageBuilder.withPayload(request.getPayload().toUpperCase())
+					.setHeader("X-Content-Type", "application/xml")
+					.setHeader("foo", "bar").build();
+			return message;
+		}
+	}
+}

spring-cloud-function-web/src/test/java/org/springframework/cloud/function/test/PojoTests.java

@@ -0,0 +1,84 @@
+/*
+ * Copyright 2012-2015 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
+ *
+ *      http://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 org.springframework.cloud.function.test;
+
+import java.util.function.Function;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.SpringBootConfiguration;
+import org.springframework.boot.test.autoconfigure.web.reactive.AutoConfigureWebTestClient;
+import org.springframework.cloud.function.context.test.FunctionalSpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.web.reactive.server.WebTestClient;
+
+import reactor.core.publisher.Mono;
+
+/**
+ * @author Dave Syer
+ *
+ */
+@RunWith(SpringRunner.class)
+@FunctionalSpringBootTest
+@AutoConfigureWebTestClient
+public class PojoTests {
+
+	@Autowired
+	private WebTestClient client;
+
+	@Test
+	public void words() throws Exception {
+		client.post().uri("/").body(Mono.just("{\"value\":\"foo\"}"), String.class).exchange()
+				.expectStatus().isOk().expectBody(String.class).isEqualTo("{\"value\":\"FOO\"}");
+	}
+
+	@SpringBootConfiguration
+	protected static class TestConfiguration implements Function<Foo, Foo> {
+		@Override
+		public Foo apply(Foo value) {
+			return new Foo(value.getValue().toUpperCase());
+		}
+	}
+}
+
+class Foo {
+
+	private String value;
+
+	public Foo() {
+	}
+
+	public Foo(String value) {
+		this.value = value;
+	}
+
+	public String getValue() {
+		return this.value;
+	}
+
+	public void setValue(String value) {
+		this.value = value;
+	}
+
+	@Override
+	public String toString() {
+		return "Foo [value=" + this.value + "]";
+	}
+
+}