[mod] move searx/testing.py to the tests directory

move robot tests to tests.robot
manage calls "python -m tests.robot"

tests/robot/__main__.py

@@ -0,0 +1,78 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+# lint: pylint
+"""Shared testing code."""
+
+# pylint: disable=missing-function-docstring
+
+import sys
+import os
+import subprocess
+import traceback
+import pathlib
+
+from splinter import Browser
+
+import tests as searx_tests
+from tests.robot import test_webapp
+
+
+class SearxRobotLayer():
+    """Searx Robot Test Layer"""
+
+    def setUp(self):
+        os.setpgrp()  # create new process group, become its leader
+
+        tests_path = pathlib.Path(searx_tests.__file__).resolve().parent
+
+        # get program paths
+        webapp = str(tests_path.parent / 'searx' / 'webapp.py')
+        exe = 'python'
+
+        # The Flask app is started by Flask.run(...), don't enable Flask's debug
+        # mode, the debugger from Flask will cause wired process model, where
+        # the server never dies.  Further read:
+        #
+        # - debug mode: https://flask.palletsprojects.com/quickstart/#debug-mode
+        # - Flask.run(..): https://flask.palletsprojects.com/api/#flask.Flask.run
+
+        os.environ['SEARX_DEBUG'] = '0'
+
+        # set robot settings path
+        os.environ['SEARX_SETTINGS_PATH'] = str(tests_path / 'robot' / 'settings_robot.yml')
+
+        # run the server
+        self.server = subprocess.Popen(  # pylint: disable=consider-using-with
+            [exe, webapp],
+            stdout=subprocess.PIPE,
+            stderr=subprocess.STDOUT
+        )
+        if hasattr(self.server.stdout, 'read1'):
+            print(self.server.stdout.read1(1024).decode())
+
+    def tearDown(self):
+        os.kill(self.server.pid, 9)
+        # remove previously set environment variable
+        del os.environ['SEARX_SETTINGS_PATH']
+
+
+def run_robot_tests(tests):
+    print('Running {0} tests'.format(len(tests)))
+    for test in tests:
+        with Browser('firefox', headless=True, profile_preferences={'intl.accept_languages': 'en'}) as browser:
+            test(browser)
+
+
+def main():
+    test_layer = SearxRobotLayer()
+    try:
+        test_layer.setUp()
+        run_robot_tests([getattr(test_webapp, x) for x in dir(test_webapp) if x.startswith('test_')])
+    except Exception:  # pylint: disable=broad-except
+        print('Error occured: {0}'.format(traceback.format_exc()))
+        sys.exit(1)
+    finally:
+        test_layer.tearDown()
+
+
+if __name__ == '__main__':
+    main()