fix: added array wrap-around functionality for the TestClock

Signed-off-by: Matt Peterson <[email protected]>

server/src/test/java/com/hedera/block/server/consumer/LiveStreamObserverImplTest.java

@@ -128,7 +128,12 @@ static class TestClock implements InstantSource {
 
         @Override
         public long millis() {
-            return millis[index++];
+            long value = millis[index];
+
+            // cycle through the provided millis
+            // and wrap around if necessary
+            index = index > millis.length - 1 ? 0 : index + 1;
+            return value;
         }
 
         @Override