[FIX] tests: increase browser_js ready code timeout

Before starting a JS test/tour the _wait_ready method evaluates if the
test is ready with a timeout of 10 sec. From times to times, it happens
that the page is not ready after this timeout but the problem is hidden.

In order to help fixing that kind of issue, the timeout is increased to
60 sec and a warning is logged to emphasis the fact that an
issue exists.

Also some unused imports are removed with this commit

odoo/tests/common.py

@@ -6,8 +6,6 @@ helpers and classes to write tests.
 """
 import base64
 import collections
-import errno
-import glob
 import importlib
 import itertools
 import json
@@ -16,19 +14,15 @@ import operator
 import os
 import re
 import requests
-import select
 import shutil
-import socket
 import subprocess
-import sys
 import tempfile
 import threading
 import time
 import unittest
 import werkzeug.urls
 from contextlib import contextmanager
-from datetime import datetime, timedelta, date
-from pprint import pformat
+from datetime import datetime, date
 
 from decorator import decorator
 from lxml import etree, html
@@ -538,13 +532,15 @@ class ChromeBrowser():
         params = {'name': name, 'value': value, 'path': path, 'domain': domain}
         self._websocket_send('Network.setCookie', params=params)
 
-    def _wait_ready(self, ready_code, timeout=10):
+    def _wait_ready(self, ready_code, timeout=60):
         _logger.info('Evaluate ready code "%s"' % ready_code)
         awaited_result = {'result': {'type': 'boolean', 'value': True}}
         ready_id = self._websocket_send('Runtime.evaluate', params={'expression': ready_code})
         last_bad_res = ''
         start_time = time.time()
-        while time.time() - start_time < timeout:
+        tdiff = time.time() - start_time
+        has_exceeded = False
+        while tdiff < timeout:
             try:
                 res = json.loads(self.ws.recv())
             except websocket.WebSocketTimeoutException:
@@ -555,6 +551,11 @@ class ChromeBrowser():
                 else:
                     last_bad_res = res
                     ready_id = self._websocket_send('Runtime.evaluate', params={'expression': ready_code})
+            tdiff = time.time() - start_time
+            if tdiff >= 2 and not has_exceeded:
+                has_exceeded = True
+                _logger.warning('The ready code takes too much time : %s' % tdiff)
+
         self.take_screenshot(prefix='failed_ready')
         _logger.info('Ready code last try result: %s' % last_bad_res or res)
         return False