TESTS: add test for the docker entrypoint script

test/test_entrypoint/docker-compose.yml

@@ -0,0 +1,18 @@
+version: '2'
+
+services:
+  nginx-proxy:
+    image: jwilder/nginx-proxy:test
+    container_name: nginx-proxy
+    volumes:
+      - /var/run/docker.sock:/tmp/docker.sock:ro
+#      - ../../docker-entrypoint.sh:/app/docker-entrypoint.sh:ro
+
+  web1:
+    container_name: web1
+    image: web
+    expose:
+      - 81
+    environment:
+      WEB_PORTS: "81"
+      VIRTUAL_HOST: web1.nginx-proxy

test/test_entrypoint/test_entrypoint.py

@@ -0,0 +1,60 @@
+from time import sleep
+
+import pytest
+import re
+import docker
+
+
+docker_client = docker.from_env()
+RE_PGREP_RESPONSE = re.compile("^(?P<pid>\d+)\n", re.MULTILINE)
+
+
+def get_pid(process_name):
+    pgrep_response = docker_client.containers.get("nginx-proxy").exec_run("pgrep %s" % process_name)
+    pids = []
+    for m in RE_PGREP_RESPONSE.finditer(pgrep_response):
+        pids.append(int(m.group("pid")))
+    assert len(pids) > 0
+    return set(pids)
+
+
+def kill(process_name):
+    docker_client.containers.get("nginx-proxy").exec_run("pkill %s" % process_name)
+    sleep(2)
+
+
+def assert_reverse_proxy_behavior(nginxproxy):
+    assert "answer from port 81\n" == nginxproxy.get("http://web1.nginx-proxy/port").text
+    docker_client.containers.get("web1").stop()
+    sleep(2)
+    assert nginxproxy.get("http://web1.nginx-proxy/").status_code == 503
+    docker_client.containers.get("web1").start()
+    sleep(2)
+    assert "answer from port 81\n" == nginxproxy.get("http://web1.nginx-proxy/port").text
+
+
+###############################################################################
+
+def test_dockergen_is_restarted_when_killed(docker_compose, nginxproxy):
+    assert_reverse_proxy_behavior(nginxproxy)
+    first_pids = get_pid("docker-gen")
+    kill("docker-gen")
+    assert_reverse_proxy_behavior(nginxproxy)
+    second_pids = get_pid("docker-gen")
+    assert first_pids != second_pids
+
+
+def test_nginx_is_restarted_when_killed(docker_compose, nginxproxy):
+    assert_reverse_proxy_behavior(nginxproxy)
+    first_pids = get_pid("nginx")
+    kill("nginx")
+    assert_reverse_proxy_behavior(nginxproxy)
+    second_pids = get_pid("nginx")
+    assert len(first_pids.intersection(second_pids)) == 0
+
+
+def test_term_signal_exits_nginxproxy(docker_compose):
+    assert "running" == docker_compose.containers.get("nginx-proxy").status
+    print docker_compose.containers.get("nginx-proxy").exec_run("kill -TERM 1")
+    sleep(2)
+    assert "exited" == docker_compose.containers.get("nginx-proxy").status