Removes an invalid test.

`cursor.executemany` should never accept SELECTs. In practice, MySQL accepts it but returns erroneous data.
But SQLite and PostgreSQL are raising an exception, as expected.

cachalot/tests/read.py

@@ -2,10 +2,6 @@
 
 from __future__ import unicode_literals
 import datetime
-try:
-    from unittest import skipIf
-except ImportError:  # For Python 2.6
-    from unittest2 import skipIf
 
 from django.contrib.auth.models import Group, Permission, User
 from django.core.cache import cache
@@ -549,23 +545,6 @@ class ReadTestCase(TransactionTestCase):
         self.assertListEqual(data2, data1)
         self.assertListEqual(data2, list(Test.objects.values_list()))
 
-    def test_cursor_executemany(self):
-        sql = 'SELECT * FROM %s WHERE name = %%s;' % Test._meta.db_table
-
-        param_list = [('test1',)]
-        with self.assertNumQueries(1):
-            cursor = connection.cursor()
-            cursor.executemany(sql, param_list)
-            data1 = list(cursor.fetchall())
-            cursor.close()
-        with self.assertNumQueries(1):
-            cursor = connection.cursor()
-            cursor.executemany(sql, param_list)
-            data2 = list(cursor.fetchall())
-            cursor.close()
-        self.assertListEqual(data2, data1)
-        self.assertListEqual(data2, list(Test.objects.filter(name='test1').values_list()))
-
     def test_missing_table_cache_key(self):
         with self.assertNumQueries(1):
             list(Test.objects.all())