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How to use _launch_processes method in Molotov

Best Python code snippet using molotov_python

test_netns_cleanup.py

Source:test_netns_cleanup.py

...56        # tests, as otherwise cleanup will kill them all57        self.get_namespaces.return_value = [l3_namespace, dhcp_namespace]58        # launch processes in each namespace to make sure they're59        # killed during cleanup60        procs_launched = self._launch_processes([l3_namespace, dhcp_namespace])61        self.assertIsNot(procs_launched, 0)62        common_utils.wait_until_true(63            lambda: self._get_num_spawned_procs() == procs_launched,64            timeout=15,65            exception=Exception("Didn't spawn expected number of processes"))66        netns_cleanup.cleanup_network_namespaces(self.conf)67        self.get_namespaces_p.stop()68        namespaces_now = ip_lib.IPWrapper.get_namespaces()69        procs_after = self._get_num_spawned_procs()70        self.assertEqual(procs_after, 0)71        self.assertNotIn(l3_namespace, namespaces_now)72        self.assertNotIn(dhcp_namespace, namespaces_now)73    @staticmethod74    def _launch_processes(namespaces):75        """76        Launch processes in the specified namespaces.77        This function will spawn processes inside the given namespaces:78                - 6 processes listening on tcp ports (parent + 5 children)79                - 1 process + 5 subprocesses listening on unix sockets80                - 1 process + 5 subprocesses listening on udp6 sockets81        First two sets of processes will process SIGTERM so when the parent82        gets killed, it will kill all spawned children83        The last set of processes will ignore SIGTERM. This will allow us84        to test the cleanup functionality which will issue a SIGKILL85        to all remaining processes after the SIGTERM attempt86        """87        commands = [['python', process_spawn.__file__,88                     '-n', NUM_SUBPROCESSES,...

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