Initial Commit

Migrating the existing structure from the following location:
https://github.com/spring-cloud-stream-app-starters/stream-applications/tree/restructuring

applications/processor/transform-processor/src/main/resources/META-INF/dataflow-configuration-metadata-whitelist.properties

@@ -0,0 +1 @@
+configuration-properties.classes=org.springframework.cloud.fn.spel.SpelFunctionProperties

applications/processor/transform-processor/src/test/java/org/springframework/cloud/stream/app/transform/processor/TransformProcessorTests.java

@@ -0,0 +1,60 @@
+/*
+ * Copyright 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
+ *
+ *      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.stream.app.transform.processor;
+
+import java.nio.charset.StandardCharsets;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.WebApplicationType;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.cloud.fn.spel.SpelFunctionConfiguration;
+import org.springframework.cloud.stream.binder.test.InputDestination;
+import org.springframework.cloud.stream.binder.test.OutputDestination;
+import org.springframework.cloud.stream.binder.test.TestChannelBinderConfiguration;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.context.annotation.Import;
+import org.springframework.messaging.Message;
+import org.springframework.messaging.support.GenericMessage;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class TransformProcessorTests {
+
+	@Test
+	public void testTransformProcessor() {
+		try (ConfigurableApplicationContext context = new SpringApplicationBuilder(
+				TestChannelBinderConfiguration.getCompleteConfiguration(TransformProcessorConfiguration.class))
+				.web(WebApplicationType.NONE)
+				.run("--spring.cloud.function.definition=byteArrayTextToString|spelFunction",
+						"--spel.function.expression=payload.toUpperCase()")) {
+
+			InputDestination processorInput = context.getBean(InputDestination.class);
+			OutputDestination processorOutput = context.getBean(OutputDestination.class);
+
+			String payload = "hello world";
+			processorInput.send(new GenericMessage<>(payload.getBytes(StandardCharsets.UTF_8)));
+			Message<byte[]> sourceMessage = processorOutput.receive(10000);
+			assertThat(new String(sourceMessage.getPayload())).isEqualTo(payload.toUpperCase());
+		}
+	}
+
+	@EnableAutoConfiguration
+	@Import({ SpelFunctionConfiguration.class })
+	public static class TransformProcessorConfiguration {}
+
+}