Added tests for BaseDatabaseIntrospection's stub methods.

tests/backends/base/test_introspection.py

@@ -0,0 +1,32 @@
+from django.db import connection
+from django.db.backends.base.introspection import BaseDatabaseIntrospection
+from django.test import SimpleTestCase
+
+
+class SimpleDatabaseIntrospectionTests(SimpleTestCase):
+    may_require_msg = (
+        'subclasses of BaseDatabaseIntrospection may require a %s() method'
+    )
+
+    def setUp(self):
+        self.introspection = BaseDatabaseIntrospection(connection=connection)
+
+    def test_get_table_list(self):
+        msg = self.may_require_msg % 'get_table_list'
+        with self.assertRaisesMessage(NotImplementedError, msg):
+            self.introspection.get_table_list(None)
+
+    def test_get_sequences(self):
+        msg = self.may_require_msg % 'get_sequences'
+        with self.assertRaisesMessage(NotImplementedError, msg):
+            self.introspection.get_sequences(None, None)
+
+    def test_get_key_columns(self):
+        msg = self.may_require_msg % 'get_key_columns'
+        with self.assertRaisesMessage(NotImplementedError, msg):
+            self.introspection.get_key_columns(None, None)
+
+    def test_get_constraints(self):
+        msg = self.may_require_msg % 'get_constraints'
+        with self.assertRaisesMessage(NotImplementedError, msg):
+            self.introspection.get_constraints(None, None)