Fix phase for TaskScheduler instances in tests

Related to: #8856

Many tests create their own `ThreadPoolTaskScheduler` beans.
Therefore, its default phase might affect the memory and performance.

* Use `phase = SmartLifecycle.DEFAULT_PHASE / 2` for manual
 `ThreadPoolTaskScheduler` beans
* Migrate affected tests classes to JUnit 5
* Make some other configuration adjustments for better performance

**Cherry-pick to `6.2.x`**

spring-integration-ip/src/test/java/org/springframework/integration/ip/config/ParserTests-context.xml

@@ -399,7 +399,7 @@
 		client-mode="true"
 		retry-interval="123000"
 		auto-startup="false"
-		scheduler="sched" />
+		scheduler="scheduler" />
 
 	<ip:tcp-connection-factory id="cfC4"
 		type="client"
@@ -414,7 +414,7 @@
 		connection-factory="cfC4"
 		client-mode="true"
 		retry-interval="124000"
-		scheduler="sched"
+		scheduler="scheduler"
 		auto-startup="false" />
 
 	<ip:tcp-connection-factory id="cfC5"
@@ -432,11 +432,14 @@
 		reply-timeout="456"
 		client-mode="true"
 		retry-interval="125000"
-		scheduler="sched"
+		scheduler="scheduler"
 		auto-startup="false"
 		/>
 
-	<task:scheduler id="sched"/>
+	<bean id="scheduler"
+				class="org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler">
+		<property name="phase" value="1073741823"/>
+	</bean>
 
 	<ip:tcp-inbound-channel-adapter id="tcpAutoChannel" />
 

spring-integration-ip/src/test/java/org/springframework/integration/ip/config/ParserUnitTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -236,7 +236,7 @@ public class ParserUnitTests {
 	TcpInboundGateway inGatewayClientMode;
 
 	@Autowired
-	TaskScheduler sched;
+	TaskScheduler scheduler;
 
 	@Autowired
 	@Qualifier("tcpOutClientMode.handler")
@@ -624,7 +624,7 @@ public class ParserUnitTests {
 		assertThat(dfa.getPropertyValue("clientConnectionFactory")).isSameAs(cfC3);
 		assertThat(dfa.getPropertyValue("serverConnectionFactory")).isNull();
 		assertThat(dfa.getPropertyValue("isClientMode")).isEqualTo(Boolean.TRUE);
-		assertThat(dfa.getPropertyValue("taskScheduler")).isSameAs(sched);
+		assertThat(dfa.getPropertyValue("taskScheduler")).isSameAs(scheduler);
 		assertThat(dfa.getPropertyValue("retryInterval")).isEqualTo(123000L);
 	}
 
@@ -634,7 +634,7 @@ public class ParserUnitTests {
 		assertThat(dfa.getPropertyValue("clientConnectionFactory")).isSameAs(cfC4);
 		assertThat(dfa.getPropertyValue("serverConnectionFactory")).isNull();
 		assertThat(dfa.getPropertyValue("isClientMode")).isEqualTo(Boolean.TRUE);
-		assertThat(dfa.getPropertyValue("taskScheduler")).isSameAs(sched);
+		assertThat(dfa.getPropertyValue("taskScheduler")).isSameAs(scheduler);
 		assertThat(dfa.getPropertyValue("retryInterval")).isEqualTo(124000L);
 	}
 
@@ -644,7 +644,7 @@ public class ParserUnitTests {
 		assertThat(dfa.getPropertyValue("clientConnectionFactory")).isSameAs(cfC5);
 		assertThat(dfa.getPropertyValue("serverConnectionFactory")).isNull();
 		assertThat(dfa.getPropertyValue("isClientMode")).isEqualTo(Boolean.TRUE);
-		assertThat(dfa.getPropertyValue("taskScheduler")).isSameAs(sched);
+		assertThat(dfa.getPropertyValue("taskScheduler")).isSameAs(scheduler);
 		assertThat(dfa.getPropertyValue("retryInterval")).isEqualTo(125000L);
 	}
 

spring-integration-ip/src/test/java/org/springframework/integration/ip/tcp/TcpInboundGatewayTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -193,6 +193,7 @@ public class TcpInboundGatewayTests {
 		assertThat(done.get()).isTrue();
 		gateway.stop();
 		executorService.shutdown();
+		taskScheduler.destroy();
 	}
 
 	@Test

spring-integration-ip/src/test/java/org/springframework/integration/ip/tcp/TcpReceivingChannelAdapterTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -35,7 +35,7 @@ import java.util.concurrent.atomic.AtomicReference;
 import javax.net.ServerSocketFactory;
 import javax.net.SocketFactory;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import org.springframework.beans.factory.BeanFactory;
 import org.springframework.core.serializer.DefaultDeserializer;
@@ -150,6 +150,7 @@ public class TcpReceivingChannelAdapterTests extends AbstractTcpChannelAdapterTe
 		latch2.countDown();
 		ccf.stop();
 		serverSocket.get().close();
+		taskScheduler.destroy();
 	}
 
 	@Test

spring-integration-ip/src/test/java/org/springframework/integration/ip/tcp/TcpSendingMessageHandlerTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -39,7 +39,7 @@ import javax.net.SocketFactory;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 import org.mockito.Mockito;
 
 import org.springframework.beans.factory.BeanFactory;
@@ -217,11 +217,12 @@ public class TcpSendingMessageHandlerTests extends AbstractTcpChannelAdapterTest
 		adapter.stop();
 		ccf.stop();
 		serverSocket.get().close();
+		taskScheduler.destroy();
 	}
 
 	@Test
 	public void testNioCrLf() throws Exception {
-		final AtomicReference<ServerSocket> serverSocket = new AtomicReference<ServerSocket>();
+		final AtomicReference<ServerSocket> serverSocket = new AtomicReference<>();
 		final CountDownLatch latch = new CountDownLatch(1);
 		final AtomicBoolean done = new AtomicBoolean();
 		this.executor.execute(() -> {

spring-integration-ip/src/test/java/org/springframework/integration/ip/udp/testIp-common-context.xml

@@ -21,6 +21,7 @@
 
 	<beans:bean id="taskScheduler" class="org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler">
 		<beans:property name="daemon" value="true" />
+		<beans:property name="phase" value="1073741823" />
 	</beans:bean>
 
 </beans:beans>