Add smoke test for Spring Integration file-copy pipeline

integration/integration-basic/src/appTest/java/com/example/si/FileCopySpringIntegrationApplicationTest.java

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+/*
+ * Copyright 2023 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 com.example.si;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.time.Duration;
+import java.util.UUID;
+
+import org.awaitility.Awaitility;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.cr.smoketest.support.assertj.AssertableOutput;
+import org.springframework.cr.smoketest.support.junit.ApplicationTest;
+import org.springframework.util.StreamUtils;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@ApplicationTest
+public class FileCopySpringIntegrationApplicationTest {
+
+	@Test
+	void connectionTest(AssertableOutput output) {
+
+		String fileName = "test-" + UUID.randomUUID() + ".txt";
+		String sourceFilePath = tempFolder("source_dir") + File.separator + fileName;
+		String destFilePath = tempFolder("dest_dir") + File.separator + fileName;
+
+		writeFile("Hello World", sourceFilePath);
+
+		Awaitility.await().atMost(Duration.ofSeconds(10)).untilAsserted(() -> {
+			assertThat(new File(destFilePath)).exists();
+			assertThat(output).hasLineContaining("Source File Payload:" + sourceFilePath);
+		});
+	}
+
+	private static String tempFolder(String suffix) {
+		String tmpDirsLocation = System.getProperty("java.io.tmpdir");
+		return tmpDirsLocation + suffix;
+	}
+
+	private static void writeFile(String fileBody, String filePath) {
+		try {
+			StreamUtils.copy(fileBody, StandardCharsets.UTF_8, new FileOutputStream(filePath));
+		}
+		catch (IOException e) {
+			throw new RuntimeException("Failed to copy test file to source directory", e);
+		}
+	}
+
+}