Relax pose check in actor no mesh test (#2196)

Signed-off-by: Ian Chen <[email protected]>

test/integration/actor_trajectory.cc

@@ -156,9 +156,12 @@ TEST_F(ActorFixture, IGN_UTILS_TEST_DISABLED_ON_MAC(ActorTrajectoryNoMesh))
     std::lock_guard<std::mutex> lock(g_mutex);
     auto it = g_modelPoses.find(boxName);
     auto &poses = it->second;
-    for (unsigned int i = 0; i < poses.size()-1; ++i)
+    for (unsigned int i = 0; i < poses.size()-2; i+=2)
     {
-      EXPECT_NE(poses[i], poses[i+1]);
+      // There could be times when the rendering thread has not updated
+      // between PostUpdates so two consecutive poses may still be the same.
+      // So check for diff between every other pose
+      EXPECT_NE(poses[i], poses[i+2]);
     }
   }