[ros2] Test for correct node_name and namespace

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I am writing integration test cases for my ROS service. Please see the sample code snippet below:

#!/usr/bin/env python
# -*- coding: utf-8 -*-

from threading import Thread
import unittest

from example_interfaces.srv import AddTwoInts
import launch
import launch_ros
import launch_ros.actions
import launch_testing.actions
import pytest
import rclpy


@pytest.mark.rostest
def generate_test_description():
    minimal_service_node = launch_ros.actions.Node(
        package='examples_rclpy_minimal_service',
        namespace='my_namespace',
        executable='service_member_function',
        name='minimal_service',
    )
    return (
        launch.LaunchDescription(
            [
                minimal_service_node,
                launch_testing.actions.ReadyToTest(),
            ]
        ),
        {
            'minimal_service': minimal_service_node,
        },
    )


class TestMinimalService(unittest.TestCase):

    @classmethod
    def setUpClass(cls):
        rclpy.init()

    @classmethod
    def tearDownClass(cls):
        rclpy.shutdown()

    def setUp(self):
        self.node = rclpy.create_node('test_minimal_service')

        # the following line is a pseudo code
        self.alll_node_names_and_namespaces = rclpy.get_node_names_and_namespaces()

        self.spin_thread = Thread(target=rclpy.spin, args=(self.node,))
        self.spin_thread.start()

    def tearDown(self):
        self.node.destroy_node()

    def test_node_namespaces(self):
        # test whether node is having with correct namespace
        namespaces = [namespace for _, namespace in self.alll_node_names_and_namespaces]
        self.assertIn('my_namespace', namespaces)

    def test_node_name(self):
        # test whether node is having with correct name
        node_names = [node_name for node_name, _ in self.alll_node_names_and_namespaces]
        self.assertIn('minimal_service', node_names)

Question

How to test whether my node is having with correct name and namespace?

Additional Info

Below is the workspace structure:

.
├── build
├── install
├── log
└── src
    └── minimal_service
        ├── CHANGELOG.rst
        ├── examples_rclpy_minimal_service
        │   ├── __init__.py
        │   └── service_member_function.py
        ├── package.xml
        ├── README.md
        ├── resource
        │   └── examples_rclpy_minimal_service
        ├── setup.cfg
        ├── setup.py
        └── test
            ├── test_copyright.py
            ├── test_flake8.py
            ├── test_pep257.py
            └── test_service_member_function.py  <- This is the newly added file

The package minimal_service has been taken from ros2/examples.

Other Info

• Operating System: Ubuntu 20.04.4 LTS
• Installation type: binaries
• Version or commit hash: ROS Foxy
• DDS implementation: Default
• Client library: rclpy