Add subscription creation test

tracetools_test/test/test_subscription.py

@@ -0,0 +1,57 @@
+import time
+import shutil
+from launch import LaunchDescription
+from launch import LaunchIntrospector
+from launch import LaunchService
+
+from launch_ros import get_default_launch_description
+import launch_ros.actions
+import unittest
+from tracetools_analysis.test.utils import get_trace_event_names
+from tracetools_trace.tools.lttng import (
+    lttng_setup,
+    lttng_start,
+    lttng_stop,
+    lttng_destroy,
+)
+
+PKG = 'tracetools_test'
+
+subscription_creation_events = [
+    'ros2:rcl_subscription_init',
+    'ros2:rclcpp_subscription_callback_added',
+]
+
+class TestSubscription(unittest.TestCase):
+
+    def test_creation(self):
+        session_name = f'session-test-subscription-creation-{time.strftime("%Y%m%d%H%M%S")}'
+        path = '/tmp/' + session_name
+        print(f'trace directory: {path}')
+
+        lttng_setup(session_name, path, ros_events=subscription_creation_events, kernel_events=None)
+        lttng_start(session_name)
+
+        ld = LaunchDescription([
+            launch_ros.actions.Node(
+                package=PKG, node_executable='test_subscription', output='screen'),
+        ])
+        ls = LaunchService()
+        ls.include_launch_description(get_default_launch_description())
+        ls.include_launch_description(ld)
+
+        exit_code = ls.run()
+        self.assertEqual(exit_code, 0)
+
+        lttng_stop(session_name)
+        lttng_destroy(session_name)
+
+        trace_events = get_trace_event_names(path)
+        print(f'trace_events: {trace_events}')
+        self.assertListEqual(subscription_creation_events, list(trace_events))
+
+        shutil.rmtree(path)
+
+
+if __name__ == '__main__':
+    unittest.main()