Add ability for user to utilize external DBs for Multi-DB sample

Updated based on code review

spring-cloud-task-samples/multiple-datasources/src/test/java/io/spring/MultiDataSourcesApplicationTests.java

@@ -35,7 +35,7 @@ public class MultiDataSourcesApplicationTests {
 	@Test
 	public void testTimeStampApp(CapturedOutput capturedOutput) throws Exception {
 
-		SpringApplication.run(MultipleDataSourcesApplication.class, new String[0]);
+		SpringApplication.run(MultipleDataSourcesApplication.class, "--spring.profiles.active=embedded");
 
 		String output = capturedOutput.toString();
 

spring-cloud-task-samples/multiple-datasources/src/test/java/io/spring/MultiDataSourcesExternalApplicationTests.java

@@ -0,0 +1,131 @@
+/*
+ * Copyright 2015-2019 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;
+
+
+import java.sql.SQLException;
+
+import org.h2.tools.Server;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.system.CapturedOutput;
+import org.springframework.boot.test.system.OutputCaptureExtension;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.test.context.junit.jupiter.SpringExtension;
+import org.springframework.util.SocketUtils;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Glenn Renfro
+ */
+@ExtendWith({OutputCaptureExtension.class, SpringExtension.class})
+@SpringBootTest(classes = { MultiDataSourcesExternalApplicationTests.TaskLauncherConfiguration.class })
+public class MultiDataSourcesExternalApplicationTests {
+	private final static String DATASOURCE_URL;
+
+	private final static String SECOND_DATASOURCE_URL;
+
+	private final static String DATASOURCE_USER_NAME = "SA";
+
+	private final static String DATASOURCE_USER_PASSWORD = "''";
+
+	private final static String DATASOURCE_DRIVER_CLASS_NAME = "org.h2.Driver";
+
+	private static int randomPort;
+
+	private static int secondRandomPort;
+
+	static {
+		randomPort = SocketUtils.findAvailableTcpPort();
+		DATASOURCE_URL = "jdbc:h2:tcp://localhost:" + randomPort
+			+ "/mem:dataflow;DB_CLOSE_DELAY=-1;" + "DB_CLOSE_ON_EXIT=FALSE";
+		secondRandomPort = SocketUtils.findAvailableTcpPort();
+		SECOND_DATASOURCE_URL = "jdbc:h2:tcp://localhost:" + randomPort
+			+ "/mem:dataflow;DB_CLOSE_DELAY=-1;" + "DB_CLOSE_ON_EXIT=FALSE";
+	}
+
+
+	@Test
+	public void testTimeStampApp(CapturedOutput capturedOutput) throws Exception {
+
+		SpringApplication.run(MultipleDataSourcesApplication.class, "--spring.profiles.active=external",
+			"--spring.datasource.url=" + DATASOURCE_URL,
+			"--spring.datasource.username=" + DATASOURCE_USER_NAME,
+			"--spring.datasource.password=" + DATASOURCE_USER_PASSWORD,
+			"--spring.datasource.driverClassName=" + DATASOURCE_DRIVER_CLASS_NAME,
+			"--second.datasource.url=" + SECOND_DATASOURCE_URL,
+			"--second.datasource.username=" + DATASOURCE_USER_NAME,
+			"--second.datasource.password=" + DATASOURCE_USER_PASSWORD,
+			"--second.datasource.driverClassName=" + DATASOURCE_DRIVER_CLASS_NAME);
+
+		String output = capturedOutput.toString();
+
+		assertThat(output.contains("There are 2 DataSources within this application"))
+			.as("Unable to find CommandLineRunner output: " + output).isTrue();
+		assertThat(output.contains("Creating: TaskExecution{"))
+			.as("Unable to find start task message: " + output).isTrue();
+		assertThat(output.contains("Updating: TaskExecution"))
+			.as("Unable to find update task message: " + output).isTrue();
+	}
+
+	@Configuration
+	public static class TaskLauncherConfiguration {
+
+		private static Server defaultServer;
+
+		private static Server secondServer;
+
+		@Bean
+		public Server initH2TCPServer() {
+			Server server = null;
+			try {
+				if (defaultServer == null) {
+					server = Server.createTcpServer("-ifNotExists", "-tcp",
+						"-tcpAllowOthers", "-tcpPort", String.valueOf(randomPort))
+						.start();
+					defaultServer = server;
+				}
+			}
+			catch (SQLException e) {
+				throw new IllegalStateException(e);
+			}
+			return defaultServer;
+		}
+
+		@Bean
+		public Server initSecondH2TCPServer() {
+			Server server = null;
+			try {
+				if (secondServer == null) {
+					server = Server.createTcpServer("-ifNotExists", "-tcp",
+						"-tcpAllowOthers", "-tcpPort", String.valueOf(secondRandomPort))
+						.start();
+					secondServer = server;
+				}
+			}
+			catch (SQLException e) {
+				throw new IllegalStateException(e);
+			}
+			return secondServer;
+		}
+	}
+}