Added an if statement to catch when there are no containers

Author: RmStorm

src/pytest_docker_compose/__init__.py

@@ -205,6 +205,12 @@ def __init__(self, docker_project: Project) -> None:
         self.docker_project = docker_project
 
     def get(self, key: str) -> Container:
-        container = self.docker_project.containers(service_names=[key])[0]
+        containers = self.docker_project.containers(service_names=[key])
+        if not containers:
+            warnings.warn(UserWarning(
+                "The service %s has no running containers containers" % key
+            ))
+            return []
+        container = containers[0]
         container.network_info = create_network_info_for_container(container)
         return container

tests/pytest_docker_compose_tests/my_network/docker-compose.yml

@@ -1,6 +1,11 @@
 version: '3'
 
 services:
+  my_service_without_containers:
+    build: ./a_buildable_container
+    entrypoint: /bin/echo
+    command: "Echoing"
+
   my_api_service:
     build: ./a_buildable_container
     ports:

tests/pytest_docker_compose_tests/test_module_scoping_fixtures.py

@@ -19,6 +19,8 @@ def wait_for_api(module_scoped_container_getter):
     service = module_scoped_container_getter.get("my_api_service").network_info[0]
     api_url = "http://%s:%s/" % (service.hostname, service.host_port)
     assert request_session.get(api_url)
+    # The container that only echoes should have run and disappeared by now:
+    assert not module_scoped_container_getter.get("my_service_without_containers")
     return request_session, api_url