[FIX] tests: close Chrome and shutdown on SIGXCPU

When Odoo receive a SIGXCPU (CPU time limit reached), it shuts down
immediately. If a headless Chrome is running, it stays alive after the
Odoo shutdown.

With this commit, the signal is intercepeted and the Chrome browser is
properly closed before shutting down the Odoo server.

odoo/tests/common.py

@@ -16,6 +16,7 @@ import platform
 import re
 import requests
 import shutil
+import signal
 import subprocess
 import tempfile
 import threading
@@ -358,6 +359,16 @@ class ChromeBrowser():
         self._websocket_send('Runtime.enable')
         self._logger.info('Chrome headless enable page notifications')
         self._websocket_send('Page.enable')
+        self.sigxcpu_handler = None
+        if os.name == 'posix':
+            self.sigxcpu_handler = signal.getsignal(signal.SIGXCPU)
+            signal.signal(signal.SIGXCPU, self.signal_handler)
+
+    def signal_handler(self, sig, frame):
+        if sig == signal.SIGXCPU:
+            _logger.info('CPU time limit reached, stopping Chrome and shutting down')
+            self.stop()
+            os._exit(0)
 
     def stop(self):
         if self.chrome_process is not None:
@@ -370,6 +381,9 @@ class ChromeBrowser():
         if self.user_data_dir and os.path.isdir(self.user_data_dir) and self.user_data_dir != '/':
             self._logger.info('Removing chrome user profile "%s"', self.user_data_dir)
             shutil.rmtree(self.user_data_dir)
+        # Restore previous signal handler
+        if self.sigxcpu_handler and os.name == 'posix':
+            signal.signal(signal.SIGXCPU, self.sigxcpu_handler)
 
     @property
     def executable(self):