Fixed #26577 -- Disabled implicit wait of Selenium tests where appropriate.

django/contrib/admin/tests.py

@@ -147,28 +147,35 @@ class AdminSeleniumTestCase(SeleniumTestCase, StaticLiveServerTestCase):
                 return option
         raise NoSuchElementException('Option "%s" not found in "%s"' % (value, selector))
 
+    def _assertOptionsValues(self, options_selector, values):
+        if values:
+            options = self.selenium.find_elements_by_css_selector(options_selector)
+            actual_values = []
+            for option in options:
+                actual_values.append(option.get_attribute('value'))
+            self.assertEqual(values, actual_values)
+        else:
+            # Prevent the `find_elements_by_css_selector` call from blocking
+            # if the selector doesn't match any options as we expect it
+            # to be the case.
+            with self.disable_implicit_wait():
+                self.wait_until(
+                    lambda driver: len(driver.find_elements_by_css_selector(options_selector)) == 0
+                )
+
     def assertSelectOptions(self, selector, values):
         """
         Asserts that the <SELECT> widget identified by `selector` has the
         options with the given `values`.
         """
-        options = self.selenium.find_elements_by_css_selector('%s > option' % selector)
-        actual_values = []
-        for option in options:
-            actual_values.append(option.get_attribute('value'))
-        self.assertEqual(values, actual_values)
+        self._assertOptionsValues("%s > option" % selector, values)
 
     def assertSelectedOptions(self, selector, values):
         """
         Asserts that the <SELECT> widget identified by `selector` has the
         selected options with the given `values`.
         """
-        options = self.selenium.find_elements_by_css_selector('%s > option' % selector)
-        actual_values = []
-        for option in options:
-            if option.get_attribute('selected'):
-                actual_values.append(option.get_attribute('value'))
-        self.assertEqual(values, actual_values)
+        self._assertOptionsValues("%s > option:checked" % selector, values)
 
     def has_css_class(self, selector, klass):
         """

django/test/selenium.py

@@ -2,6 +2,7 @@ from __future__ import unicode_literals
 
 import sys
 import unittest
+from contextlib import contextmanager
 
 from django.test import LiveServerTestCase, tag
 from django.utils.module_loading import import_string
@@ -56,11 +57,12 @@ class SeleniumTestCaseBase(type(LiveServerTestCase)):
 
 @tag('selenium')
 class SeleniumTestCase(with_metaclass(SeleniumTestCaseBase, LiveServerTestCase)):
+    implicit_wait = 10
 
     @classmethod
     def setUpClass(cls):
         cls.selenium = cls.create_webdriver()
-        cls.selenium.implicitly_wait(10)
+        cls.selenium.implicitly_wait(cls.implicit_wait)
         super(SeleniumTestCase, cls).setUpClass()
 
     @classmethod
@@ -71,3 +73,12 @@ class SeleniumTestCase(with_metaclass(SeleniumTestCaseBase, LiveServerTestCase))
         if hasattr(cls, 'selenium'):
             cls.selenium.quit()
         super(SeleniumTestCase, cls)._tearDownClassInternal()
+
+    @contextmanager
+    def disable_implicit_wait(self):
+        """Context manager that disables the default implicit wait."""
+        self.selenium.implicitly_wait(0)
+        try:
+            yield
+        finally:
+            self.selenium.implicitly_wait(self.implicit_wait)