Restore test exception for Connext (ros2#1625)

Signed-off-by: Andrea Sorbini <[email protected]>

Author: asorbini

rclcpp/test/rclcpp/strategies/test_allocator_memory_strategy.cpp

@@ -511,8 +511,10 @@ TEST_F(TestAllocatorMemoryStrategy, number_of_entities_with_subscription) {
   RclWaitSetSizes expected_sizes = {};
   expected_sizes.size_of_subscriptions = 1;
   const std::string implementation_identifier = rmw_get_implementation_identifier();
-  if (implementation_identifier == "rmw_cyclonedds_cpp") {
-    // For cyclonedds, a subscription will also add an event and waitable
+  if (implementation_identifier == "rmw_cyclonedds_cpp" ||
+    implementation_identifier == "rmw_connextdds")
+  {
+    // For cyclonedds and connext, a subscription will also add an event and waitable
     expected_sizes.size_of_events += 1;
     expected_sizes.size_of_waitables += 1;
   }