Add initial RSocket test with RoutingFunction

spring-cloud-function-rsocket/src/test/java/org/springframework/cloud/function/rsocket/RSocketAutoConfigurationRoutingTests.java

@@ -0,0 +1,124 @@
+/*
+ * 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 org.springframework.cloud.function.rsocket;
+
+import java.util.function.Consumer;
+import java.util.function.Function;
+import java.util.function.Supplier;
+
+import org.junit.jupiter.api.Test;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Sinks;
+import reactor.test.StepVerifier;
+
+import org.springframework.boot.WebApplicationType;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.cloud.function.context.config.RoutingFunction;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.messaging.rsocket.RSocketRequester;
+import org.springframework.util.MimeTypeUtils;
+import org.springframework.util.SocketUtils;
+
+/**
+ *
+ * @author Oleg Zhurakousky
+ * @since 3.1
+ */
+public class RSocketAutoConfigurationRoutingTests {
+	@Test
+	public void testImperativeFunctionAsRequestReplyWithDefinition() {
+		int port = SocketUtils.findAvailableTcpPort();
+		try (
+			ConfigurableApplicationContext applicationContext =
+				new SpringApplicationBuilder(SampleFunctionConfiguration.class)
+					.web(WebApplicationType.NONE)
+					.run("--logging.level.org.springframework.cloud.function=DEBUG",
+							"--spring.cloud.function.routing-expression=headers.func_name",
+							"--spring.cloud.function.expected-content-type=text/plain",
+							"--spring.rsocket.server.port=" + port);
+		) {
+			RSocketRequester.Builder rsocketRequesterBuilder =
+				applicationContext.getBean(RSocketRequester.Builder.class);
+
+			rsocketRequesterBuilder.tcp("localhost", port)
+				.route(RoutingFunction.FUNCTION_NAME)
+				.metadata("{\"func_name\":\"echo\"}", MimeTypeUtils.APPLICATION_JSON)
+				.data("hello")
+				.retrieveMono(String.class)
+				.as(StepVerifier::create)
+				.expectNext("hello")
+				.expectComplete()
+				.verify();
+
+			rsocketRequesterBuilder.tcp("localhost", port)
+			.route(RoutingFunction.FUNCTION_NAME)
+			.metadata("{\"func_name\":\"uppercase\"}", MimeTypeUtils.APPLICATION_JSON)
+			.data("hello")
+			.retrieveMono(String.class)
+			.as(StepVerifier::create)
+			.expectNext("HELLO")
+			.expectComplete()
+			.verify();
+		}
+	}
+
+
+	@EnableAutoConfiguration
+	@Configuration
+	public static class SampleFunctionConfiguration {
+
+		final Sinks.One<byte[]> consumerData = Sinks.one();
+
+		@Bean
+		public Function<String, String> uppercase() {
+			return v -> v.toUpperCase();
+		}
+
+		@Bean
+		public Function<String, String> concat() {
+			return v -> v + v;
+		}
+
+		@Bean
+		public Function<String, String> echo() {
+			return v -> v;
+		}
+
+		@Bean
+		public Function<Flux<String>, Flux<String>> uppercaseReactive() {
+			return flux -> flux.map(v -> {
+				System.out.println("Uppercasing: " + v);
+				return v.toUpperCase();
+			});
+		}
+
+		@Bean
+		public Consumer<byte[]> log() {
+			return this.consumerData::tryEmitValue;
+		}
+
+		@Bean
+		public Supplier<String> source() {
+			return () -> "test data";
+		}
+
+	}
+
+}