TESTS: rewrite tests using pytest and docker-compose

Experimentation to see if it is worth the effort

test2/requirements/README.md

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+This directory contains ressources to build Docker images tests depend on
+
+# Build images
+
+    ./build.sh   
+
+
+# Images
+
+## web
+
+This container will run one or many webservers, each of them listening on a single port.
+
+Ports are specified using the `WEB_PORTS` environment variable:
+
+    docker run -d -e WEB_PORTS=80 web  # will create a container running one webserver listening on port 80
+    docker run -d -e WEB_PORTS="80 81" web  # will create a container running two webservers, one listening on port 80 and a second one listening on port 81
+
+The webserver answer for two paths:
+
+- `/headers`
+- `/port`
+
+```
+$ docker run -d -e WEB_PORTS=80 -p 80:80 web
+$ curl http://127.0.0.1:80/headers
+Host: 127.0.0.1
+User-Agent: curl/7.47.0
+Accept: */*
+
+$ curl http://127.0.0.1:80/port
+answer from port 80
+
+```
+

test2/requirements/build.sh

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+#!/bin/bash
+set -e
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+docker build -t web $DIR/web 

test2/requirements/web/Dockerfile

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+# Docker Image running one (or multiple) webservers listening on all given ports from WEB_PORTS environment variable
+
+FROM python:3
+COPY ./webserver.py /
+COPY ./entrypoint.sh /
+WORKDIR /opt
+ENTRYPOINT ["/bin/bash", "/entrypoint.sh"]
+

test2/requirements/web/entrypoint.sh

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+#!/bin/bash
+set -u
+
+trap '[ ${#PIDS[@]} -gt 0 ] && kill -TERM ${PIDS[@]}' TERM
+declare -a PIDS
+
+for port in $WEB_PORTS; do
+	echo starting a web server listening on port $port;
+	/webserver.py $port &
+	PIDS+=($!)
+done
+
+wait ${PIDS[@]}
+trap - TERM
+wait ${PIDS[@]}

test2/requirements/web/webserver.py

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+#!/usr/bin/env python3
+
+import os, sys
+import http.server
+import socketserver
+
+class BatsHandler(http.server.SimpleHTTPRequestHandler):
+    def do_GET(self):
+        root = os.getcwd()
+        
+        self.send_response(200)
+        self.send_header("Content-Type", "text/plain")
+        self.end_headers()
+
+        if self.path == "/headers":
+            self.wfile.write(self.headers.as_string().encode())
+        elif self.path == "/port":
+            response = "answer from port %s\n" % PORT
+            self.wfile.write(response.encode())
+        else:
+            self.wfile.write("No route for this path!\n".encode())
+
+if __name__ == '__main__':
+    PORT = int(sys.argv[1])
+    socketserver.TCPServer.allow_reuse_address = True
+    httpd = socketserver.TCPServer(('0.0.0.0', PORT), BatsHandler)
+    httpd.serve_forever()