Removed hard-coded expected results in SeleniumTests.test_select_mult…

…iple test.

This ensures that both tests, test_select() and test_select_multiple(),
use analogous calculations for the expected amount of results, and for
the iteration when pressing "arrow down" and waiting for the ajax call
to complete.

tests/admin_views/test_autocomplete_view.py

@@ -461,8 +461,8 @@ def test_select(self):
         )
         search = self.selenium.find_element(By.CSS_SELECTOR, ".select2-search__field")
         # Load next page of results by scrolling to the bottom of the list.
-        with self.select2_ajax_wait():
-            for _ in range(PAGINATOR_SIZE + 1):
+        for _ in range(PAGINATOR_SIZE + 1):
+            with self.select2_ajax_wait():
                 search.send_keys(Keys.ARROW_DOWN)
         # All objects are now loaded.
         self.assertCountSeleniumElements(
@@ -532,15 +532,19 @@ def test_select_multiple(self):
             with self.select2_ajax_wait():
                 search.send_keys(Keys.ARROW_DOWN)
         self.assertCountSeleniumElements(
-            ".select2-results__option", 31, root_element=result_container
+            ".select2-results__option",
+            PAGINATOR_SIZE + 11,
+            root_element=result_container,
         )
         # Limit the results with the search field.
         with self.select2_ajax_wait():
             search.send_keys("Who")
             # Ajax request is delayed.
             self.assertIs(result_container.is_displayed(), True)
             self.assertCountSeleniumElements(
-                ".select2-results__option", 32, root_element=result_container
+                ".select2-results__option",
+                PAGINATOR_SIZE + 12,
+                root_element=result_container,
             )
         self.assertIs(result_container.is_displayed(), True)