openvidu-test-e2e: Fix streamPropertyChangedEventTest race condition.

This supposedly fix a flaky test. If the event reaches before the viewport resolution is known, test would fail.
Now the viewport resolution is adquired in a new Thread and the resolution is not compared until the event
and viewport resolution are received

openvidu-test-e2e/src/test/java/io/openvidu/test/e2e/OpenViduTestAppE2eTest.java

@@ -931,6 +931,7 @@ public class OpenViduTestAppE2eTest extends AbstractOpenViduTestappE2eTest {
 		}
 
 		// Resize captured window
+		final CountDownLatch latchViewport = new CountDownLatch(1);
 		final CountDownLatch latch3 = new CountDownLatch(2);
 		int newWidth = 1000;
 		int newHeight = 700;
@@ -938,6 +939,8 @@ public class OpenViduTestAppE2eTest extends AbstractOpenViduTestappE2eTest {
 		final long[] expectedWidthHeight = new long[2];
 
 		user.getEventManager().on("streamPropertyChanged", (event) -> {
+			try {
+				if (latchViewport.await(4000, TimeUnit.MILLISECONDS)) {
 					String expectedDimensions = "{\"width\":" + expectedWidthHeight[0] + ",\"height\":" + expectedWidthHeight[1]
 							+ "}";
 					System.out.println("Publisher dimensions: " + event.get("newValue").getAsJsonObject().toString());
@@ -947,10 +950,16 @@ public class OpenViduTestAppE2eTest extends AbstractOpenViduTestappE2eTest {
 							&& expectedDimensions.equals(event.get("newValue").getAsJsonObject().toString())) {
 						latch3.countDown();
 					}
+				}
+			} catch (InterruptedException e) {
+				log.error("Error waiting for viewport resolution");
+			}
 		});
 
 		user.getDriver().manage().window().setSize(new Dimension(newWidth, newHeight));
 
+
+		new Thread(() -> {
 			String widthAndHeight = user.getEventManager().getDimensionOfViewport();
 			JsonObject obj = JsonParser.parseString(widthAndHeight).getAsJsonObject();
 
@@ -958,6 +967,9 @@ public class OpenViduTestAppE2eTest extends AbstractOpenViduTestappE2eTest {
 			expectedWidthHeight[1] = obj.get("height").getAsLong();
 
 			System.out.println("New viewport dimension: " + obj.toString());
+			latchViewport.countDown();
+
+		}).start();
 
 		user.getEventManager().waitUntilEventReaches("streamPropertyChanged", 6);