rosout_publish_test.py

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# Author: Tyler Weaver
 
import unittest
from threading import Event
from threading import Thread
 
import launch
import launch_ros
import launch_testing
import rclpy
from rclpy.node import Node
from rcl_interfaces.msg import Log
 
import pytest
 
 
@pytest.mark.launch_test
def generate_test_description():
    # dut: device under test
    dut_process = launch_ros.actions.Node(
        package="moveit_core",
        executable=launch.substitutions.LaunchConfiguration("dut"),
        output="screen",
    )
 
    return launch.LaunchDescription(
        [
            launch.actions.DeclareLaunchArgument(
                "dut",
                description="Executable to launch",
            ),
            dut_process,
            # Start tests right away - no need to wait for anything
            launch_testing.actions.ReadyToTest(),
        ]
    ), {"dut_process": dut_process}
 
 
class MakeRosoutObserverNode(Node):
    def __init__(self, name="rosout_observer_node"):
        super().__init__(name)
        self.msg_event_objectmsg_event_object = Event()
 
    def start_subscriber(self):
        # Create a subscriber
        self.subscriptionsubscription = self.create_subscription(
            Log, "rosout", self.subscriber_callbacksubscriber_callback, 10
        )
 
        # Add a spin thread
        self.ros_spin_threadros_spin_thread = Thread(
            target=lambda node: rclpy.spin(node), args=(self,)
        )
        self.ros_spin_threadros_spin_thread.start()
 
    def subscriber_callback(self, data):
        self.msg_event_objectmsg_event_object.set()
 
 
# These tests will run concurrently with the dut process.  After all these tests are done,
# the launch system will shut down the processes that it started up
class TestFixture(unittest.TestCase):
    def test_rosout_msgs_published(self, proc_output):
        rclpy.init()
        try:
            node = MakeRosoutObserverNode()
            node.start_subscriber()
            msgs_received_flag = node.msg_event_object.wait(timeout=5.0)
            assert msgs_received_flag, "Did not receive msgs !"
        finally:
            rclpy.shutdown()
 
 
@launch_testing.post_shutdown_test()
class TestProcessOutput(unittest.TestCase):
    def test_exit_code(self, proc_info):
        # Check that all processes in the launch (in this case, there's just one) exit
        # with code 0
        launch_testing.asserts.assertExitCodes(proc_info)