Increased test coverage for db/backends/base/operations.py.

tests/backends/base/test_operations.py

@@ -1,8 +1,137 @@
+import decimal
+
 from django.db import NotSupportedError, connection
-from django.test import SimpleTestCase, skipIfDBFeature
+from django.db.backends.base.operations import BaseDatabaseOperations
+from django.db.models import DurationField
+from django.test import SimpleTestCase, override_settings, skipIfDBFeature
+from django.utils import timezone
 
 
 class DatabaseOperationTests(SimpleTestCase):
+    may_requre_msg = 'subclasses of BaseDatabaseOperations may require a %s() method'
+
+    def setUp(self):
+        self.ops = BaseDatabaseOperations(connection=connection)
+
+    @skipIfDBFeature('can_distinct_on_fields')
+    def test_distinct_on_fields(self):
+        msg = 'DISTINCT ON fields is not supported by this database backend'
+        with self.assertRaisesMessage(NotSupportedError, msg):
+            self.ops.distinct_sql(['a', 'b'])
+
+    def test_deferrable_sql(self):
+        self.assertEqual(self.ops.deferrable_sql(), '')
+
+    def test_end_transaction_rollback(self):
+        self.assertEqual(self.ops.end_transaction_sql(success=False), 'ROLLBACK;')
+
+    def test_no_limit_value(self):
+        with self.assertRaisesMessage(NotImplementedError, self.may_requre_msg % 'no_limit_value'):
+            self.ops.no_limit_value()
+
+    def test_quote_name(self):
+        with self.assertRaisesMessage(NotImplementedError, self.may_requre_msg % 'quote_name'):
+            self.ops.quote_name('a')
+
+    def test_regex_lookup(self):
+        with self.assertRaisesMessage(NotImplementedError, self.may_requre_msg % 'regex_lookup'):
+            self.ops.regex_lookup(lookup_type='regex')
+
+    def test_set_time_zone_sql(self):
+        self.assertEqual(self.ops.set_time_zone_sql(), '')
+
+    def test_sql_flush(self):
+        msg = 'subclasses of BaseDatabaseOperations must provide an sql_flush() method'
+        with self.assertRaisesMessage(NotImplementedError, msg):
+            self.ops.sql_flush(None, None, None)
+
+    def test_pk_default_value(self):
+        self.assertEqual(self.ops.pk_default_value(), 'DEFAULT')
+
+    def test_tablespace_sql(self):
+        self.assertEqual(self.ops.tablespace_sql(None), '')
+
+    def test_sequence_reset_by_name_sql(self):
+        self.assertEqual(self.ops.sequence_reset_by_name_sql(None, []), [])
+
+    def test_adapt_unknown_value_decimal(self):
+        value = decimal.Decimal('3.14')
+        self.assertEqual(
+            self.ops.adapt_unknown_value(value),
+            self.ops.adapt_decimalfield_value(value)
+        )
+
+    def test_adapt_unknown_value_date(self):
+        value = timezone.now().date()
+        self.assertEqual(self.ops.adapt_unknown_value(value), self.ops.adapt_datefield_value(value))
+
+    def test_adapt_unknown_value_time(self):
+        value = timezone.now().time()
+        self.assertEqual(self.ops.adapt_unknown_value(value), self.ops.adapt_timefield_value(value))
+
+    def test_adapt_timefield_value_none(self):
+        self.assertIsNone(self.ops.adapt_timefield_value(None))
+
+    def test_adapt_datetimefield_value(self):
+        self.assertIsNone(self.ops.adapt_datetimefield_value(None))
+
+    def test_adapt_timefield_value(self):
+        msg = 'Django does not support timezone-aware times.'
+        with self.assertRaisesMessage(ValueError, msg):
+            self.ops.adapt_timefield_value(timezone.make_aware(timezone.now()))
+
+    @override_settings(USE_TZ=False)
+    def test_adapt_timefield_value_unaware(self):
+        now = timezone.now()
+        self.assertEqual(self.ops.adapt_timefield_value(now), str(now))
+
+    def test_date_extract_sql(self):
+        with self.assertRaisesMessage(NotImplementedError, self.may_requre_msg % 'date_extract_sql'):
+            self.ops.date_extract_sql(None, None)
+
+    def test_time_extract_sql(self):
+        with self.assertRaisesMessage(NotImplementedError, self.may_requre_msg % 'date_extract_sql'):
+            self.ops.time_extract_sql(None, None)
+
+    def test_date_interval_sql(self):
+        with self.assertRaisesMessage(NotImplementedError, self.may_requre_msg % 'date_interval_sql'):
+            self.ops.date_interval_sql(None)
+
+    def test_date_trunc_sql(self):
+        with self.assertRaisesMessage(NotImplementedError, self.may_requre_msg % 'date_trunc_sql'):
+            self.ops.date_trunc_sql(None, None)
+
+    def test_time_trunc_sql(self):
+        with self.assertRaisesMessage(NotImplementedError, self.may_requre_msg % 'time_trunc_sql'):
+            self.ops.time_trunc_sql(None, None)
+
+    def test_datetime_trunc_sql(self):
+        with self.assertRaisesMessage(NotImplementedError, self.may_requre_msg % 'datetime_trunc_sql'):
+            self.ops.datetime_trunc_sql(None, None, None)
+
+    def test_datetime_cast_date_sql(self):
+        with self.assertRaisesMessage(NotImplementedError, self.may_requre_msg % 'datetime_cast_date_sql'):
+            self.ops.datetime_cast_date_sql(None, None)
+
+    def test_datetime_cast_time_sql(self):
+        with self.assertRaisesMessage(NotImplementedError, self.may_requre_msg % 'datetime_cast_time_sql'):
+            self.ops.datetime_cast_time_sql(None, None)
+
+    def test_datetime_extract_sql(self):
+        with self.assertRaisesMessage(NotImplementedError, self.may_requre_msg % 'datetime_extract_sql'):
+            self.ops.datetime_extract_sql(None, None, None)
+
+    @skipIfDBFeature('supports_temporal_subtraction')
+    def test_subtract_temporals(self):
+        duration_field = DurationField()
+        duration_field_internal_type = duration_field.get_internal_type()
+        msg = (
+            'This backend does not support %s subtraction.' %
+            duration_field_internal_type
+        )
+        with self.assertRaisesMessage(NotSupportedError, msg):
+            self.ops.subtract_temporals(duration_field_internal_type, None, None)
+
     @skipIfDBFeature('supports_over_clause')
     def test_window_frame_raise_not_supported_error(self):
         msg = 'This backend does not support window expressions.'