Issue 7019 - [CMS] Refactor `test_server.py`

tests/utils.py

 # This file is part of the Adblock Plus web scripts,
 # Copyright (C) 2006-present eyeo GmbH
 #
 # Adblock Plus is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 3 as
 # published by the Free Software Foundation.
 #
 # Adblock Plus is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
@@ skipping 19 matching lines @@
     for dirpath, dirnames, filenames in os.walk(path):
         for output_file in filenames:
             filepath = os.path.join(dirpath, output_file)
             with open(filepath) as f:
                 locale = os.path.split(os.path.split(filepath)[0])[1]
                 dirdata[os.path.join(locale, output_file)] = f.read().strip()
     return dirdata
 
 
 @contextlib.contextmanager
-def run_test_server(site_path):
+def run_test_server(site_path, new_env=None):
     """Run test server, yield its URL. Terminate server on next iteration.
 
     This function is intended be used in a pytest fixture.
+
+    Parameters
+    ----------
+    site_path: str
+        The path to the website's source code.
+    new_env: dict
+        The environment under which the server will be run. If `None`, this
+        will be inherited from the main process.
+
+    Returns
+    -------
+    str
+        The url where the server runs.
+
     """
     args = ['python', 'runserver.py', site_path]
     # Werkzeug is a dependency of flask which we are using for the mock api
     # however there is an issue with Werkzeug that prevents it from properly
     # handling the SIGTERM sent by p.kill() or terminate()
     # Issue: https://github.com/pallets/werkzeug/issues/58
-    p = subprocess.Popen(args, stdout=subprocess.PIPE, preexec_fn=os.setsid)
+    p = subprocess.Popen(args, stdout=subprocess.PIPE, preexec_fn=os.setsid,
+                         env=new_env)
     time.sleep(0.5)
     yield 'http://localhost:5000/'
-    os.killpg(os.getpgid(p.pid), signal.SIGTERM)
+    os.killpg(os.getpgid(p.pid), signal.SIGINT)
 
 
 def create_in_memory_zip(file_names, file_data):
     """Create a BytesIO object with the contents of a zip file.
 
     Parameters
     ----------
     file_names: iterable
         Of file names. Should be the full paths of the file inside the zip.
     file_data: iterable
@@ skipping 13 matching lines @@
 
     memory_zip.seek(0)
     return memory_zip
 
 
 def exception_test(func, exception, exp_msg, *args, **kw):
     with pytest.raises(exception) as err:
         func(*args, **kw)
 
     assert exp_msg in str(err.value)