Fix TriggeredPublisher test (#2354)

Signed-off-by: Addisu Z. Taddese <[email protected]>

test/integration/triggered_publisher.cc

@@ -721,6 +721,16 @@ TEST_F(TriggeredPublisherTest,
 
   std::string service = "/srv-test";
   node.Advertise(service, srvEchoCb);
+  {
+    // This block of code is here because service requests from a previous test
+    // might interfere with this test. We sleep a small amount time and reset
+    // `recvCount` to 0. This ensures that the service requets from the previous
+    // test are discarded properly.
+    // TODO(azeey) Remove once
+    // https://github.com/gazebosim/gz-transport/issues/491 is resolved.
+    GZ_SLEEP_MS(2000);
+    recvCount = 0;
+  }
 
   const std::size_t pubCount{10};
   for (std::size_t i = 0; i < pubCount; ++i)