Fix failing developer tools tests

Tweak timings for some tests to fix failures that only occur on Linux
machines.

See gh-3082

spring-boot-developer-tools/src/test/java/org/springframework/boot/developertools/restart/RestarterTests.java

@@ -91,10 +91,10 @@ public class RestarterTests {
 
 		};
 		thread.start();
-		Thread.sleep(1600);
+		Thread.sleep(2600);
 		String output = this.out.toString();
-		assertThat(StringUtils.countOccurrencesOf(output, "Tick 0"), greaterThan(2));
-		assertThat(StringUtils.countOccurrencesOf(output, "Tick 1"), greaterThan(2));
+		assertThat(StringUtils.countOccurrencesOf(output, "Tick 0"), greaterThan(1));
+		assertThat(StringUtils.countOccurrencesOf(output, "Tick 1"), greaterThan(1));
 	}
 
 	@Test
@@ -199,12 +199,12 @@ public class RestarterTests {
 
 		private static volatile boolean quit = false;
 
-		@Scheduled(fixedDelay = 100)
+		@Scheduled(fixedDelay = 200)
 		public void tickBean() {
 			System.out.println("Tick " + this.count++ + " " + Thread.currentThread());
 		}
 
-		@Scheduled(initialDelay = 350, fixedDelay = 350)
+		@Scheduled(initialDelay = 500, fixedDelay = 500)
 		public void restart() {
 			System.out.println("Restart " + Thread.currentThread());
 			if (!SampleApplication.quit) {

spring-boot-developer-tools/src/test/java/org/springframework/boot/developertools/tunnel/client/TunnelClientTests.java

@@ -84,6 +84,7 @@ public class TunnelClientTests {
 		client.start();
 		SocketChannel channel = SocketChannel
 				.open(new InetSocketAddress(this.listenPort));
+		Thread.sleep(200);
 		channel.close();
 		client.getServerThread().stopAcceptingConnections();
 		client.getServerThread().join(2000);
@@ -97,6 +98,7 @@ public class TunnelClientTests {
 		client.start();
 		SocketChannel channel = SocketChannel
 				.open(new InetSocketAddress(this.listenPort));
+		Thread.sleep(200);
 		client.stop();
 		assertThat(this.tunnelConnection.getOpenedTimes(), equalTo(1));
 		assertThat(this.tunnelConnection.isOpen(), equalTo(false));
@@ -111,6 +113,7 @@ public class TunnelClientTests {
 		client.start();
 		SocketChannel channel = SocketChannel
 				.open(new InetSocketAddress(this.listenPort));
+		Thread.sleep(200);
 		channel.close();
 		client.getServerThread().stopAcceptingConnections();
 		client.getServerThread().join(2000);