add test to check if rosdep correctly install python-lxml, see ros/ro…

…sdistro#31569

CMakeLists.txt

@@ -10,6 +10,7 @@ if(CATKIN_ENABLE_TESTING)
   # Check if rosdep is correctly install scipy
   if ("$ENV{ROS_DISTRO}" STRGREATER "hydro") # hydro does not install pip scipy
     catkin_add_nosetests(test/test_scipy.py)
+    catkin_add_nosetests(test/test_lxml.py)
   endif()
 endif()
 

package.xml

@@ -18,6 +18,8 @@
   <build_depend condition="$ROS_PYTHON_VERSION == 3">python3</build_depend>
   <build_depend condition="$ROS_PYTHON_VERSION == 2">python-scipy</build_depend>
   <build_depend condition="$ROS_PYTHON_VERSION == 3">python3-scipy</build_depend>
+  <build_depend condition="$ROS_PYTHON_VERSION == 2">python-lxml</build_depend>
+  <build_depend condition="$ROS_PYTHON_VERSION == 3">python3-lxml</build_depend>
   <build_depend>catkin</build_depend>
   <build_depend>rostest</build_depend>
   <test_depend>rospy_tutorials</test_depend>

test/test_lxml.py

@@ -0,0 +1,18 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+from __future__ import print_function
+
+import sys
+import unittest
+
+class TestLexml(unittest.TestCase):
+
+    def test_lxml(self):
+
+        import lxml
+        print(lxml)
+        self.assertTrue('true')
+
+if __name__ == '__main__':
+    unittest.main()