INT-3786: Fix Several Sporadic Test Failures

JIRA: https://jira.spring.io/browse/INT-3786

* Increase `receiveTimeout` for several `QueueChannel` and `CountDownLatch` based tests
* Fix `FileSplitterTests` for Windows compatibility - `UTF-8` for bytes conversion
* Make some STOMP tests as `LongRunning`

The next fixing phase

spring-integration-jmx/src/test/java/org/springframework/integration/jmx/MBeanAttributeFilterTests.java

@@ -62,7 +62,7 @@ public class MBeanAttributeFilterTests {
 	@Autowired
 	private String domain;
 
-	private final long testTimeout = 1000L;
+	private final long testTimeout = 10000L;
 
 	@Test
 	public void testAttributeFilter() {

spring-integration-jmx/src/test/java/org/springframework/integration/monitor/ChannelIntegrationTests-context.xml

@@ -1,9 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xmlns:int="http://www.springframework.org/schema/integration" xmlns:context="http://www.springframework.org/schema/context"
+	xmlns:int="http://www.springframework.org/schema/integration"
 	xsi:schemaLocation="http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration.xsd
-		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
-		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
+		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
 
 	<int:channel id="requests" />
 
@@ -23,8 +22,12 @@
 		<property name="locateExistingServerIfPossible" value="true" />
 	</bean>
 
-	<int:inbound-channel-adapter id="source" channel="nullChannel" expression="''">
+	<int:inbound-channel-adapter id="source" channel="sourceChannel" expression="''">
 		<int:poller fixed-delay="10" />
 	</int:inbound-channel-adapter>
 
+	<int:channel id="sourceChannel">
+		<int:queue/>
+	</int:channel>
+
 </beans>

spring-integration-jmx/src/test/java/org/springframework/integration/monitor/ChannelIntegrationTests.java

@@ -10,6 +10,7 @@
  * 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.integration.monitor;
 
 import static org.junit.Assert.assertEquals;
@@ -33,6 +34,7 @@ import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 /**
  * @author Dave Syer
  * @author Gary Russell
+ * @author Artem Bilan
  * @since 2.0
  */
 @ContextConfiguration
@@ -46,6 +48,9 @@ public class ChannelIntegrationTests {
 	@Autowired
 	private PollableChannel intermediate;
 
+	@Autowired
+	private PollableChannel sourceChannel;
+
 	@Autowired
 	private IntegrationMBeanExporter messageChannelsMonitor;
 
@@ -85,7 +90,7 @@ public class ChannelIntegrationTests {
 		assertEquals(3, handlerMetrics.getHandleCount());
 		assertEquals(1, handlerMetrics.getErrorCount());
 
-		Thread.sleep(50);
+		assertNotNull(this.sourceChannel.receive(10000));
 
 		assertTrue(messageChannelsMonitor.getSourceMessageCount("source") > 0);
 		assertTrue(messageChannelsMonitor.getSourceMetrics("source").getMessageCount() > 0);

spring-integration-jmx/src/test/java/org/springframework/integration/monitor/MonitorTests-context.xml

@@ -16,9 +16,11 @@
 	<int:channel id="input">
 		<int:queue />
 	</int:channel>
-	
+
+	<bean id="testTrigger" class="org.springframework.integration.test.util.OnlyOnceTrigger"/>
+
 	<int:bridge input-channel="input" output-channel="next">
-		<int:poller fixed-delay="500" />
+		<int:poller trigger="testTrigger" />
 	</int:bridge>
 
 	<int:service-activator input-channel="next">