[test][databases] Use random port for tests

beat/core/test/test_docker_databases_provider.py

@@ -49,6 +49,7 @@ from beat.backend.python.data import RemoteDataSource
 from beat.backend.python.data import RemoteException
 
 from ..dock import Host
+from ..utils import find_free_port
 
 from . import prefix
 from . import tmp_prefix
@@ -149,10 +150,11 @@ class TestDatabasesProvider(unittest.TestCase):
         view = database.view(input_cfg['protocol'], input_cfg['set'])
         view.index(os.path.join(self.cache_root, input_cfg['path']))
 
+        port = find_free_port()
         cmd = [
             'databases_provider',
             '--debug',
-            '0.0.0.0:51000',
+            '0.0.0.0:%i' % port,
             '/beat/prefix',
             '/beat/cache',
         ]
@@ -165,13 +167,13 @@ class TestDatabasesProvider(unittest.TestCase):
         self.databases_container.add_volume('/tmp', os.path.join('/beat/datasets', input_cfg['database']))
         self.databases_container.add_volume(self.cache_root, '/beat/cache')
 
-        self.databases_container.add_port(51000, 51000, host_address=self.host.ip)
+        self.databases_container.add_port(port, port, host_address=self.host.ip)
 
         self.host.start(self.databases_container)
 
         self.client_context = zmq.Context()
         self.client_socket = self.client_context.socket(zmq.PAIR)
-        self.client_socket.connect('tcp://' + self.host.ip + ':51000')
+        self.client_socket.connect('tcp://{}:{}'.format(self.host.ip, port))
 
         dataformat_name = database.set(input_cfg['protocol'], input_cfg['set'])['outputs'][input_cfg['output']]