Add test that includes gz/sim.hh

Not all of the needed include paths are exported with
the gz-sim target, so including the gz/sim.hh header
doesn't work easily. This test fails to build and
illustrates the problem.

Signed-off-by: Steve Peters <[email protected]>

Author: scpeters

test/integration/CMakeLists.txt

@@ -33,6 +33,7 @@ set(tests
   hydrodynamics.cc
   hydrodynamics_flags.cc
   imu_system.cc
+  include_sim_hh.cc
   joint.cc
   joint_controller_system.cc
   joint_position_controller_system.cc

test/integration/include_sim_hh.cc

@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2023 Open Source Robotics Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+*/
+
+#include <gtest/gtest.h>
+
+#include <gz/sim.hh>
+
+/////////////////////////////////////////////////
+// Simple test to make sure it compiles
+TEST(Compilation, sim_hh)
+{
+  gz::sim::System system;
+}