SA14: Add test cases for new dialect method get_view_names

In order to test cases when views are actually _present_, some would
have to be created. This is out of scope for this patch.

- https://github.com/sqlalchemy/sqlalchemy/wiki/Views
- https://github.com/jklukas/sqlalchemy-views
- https://stackoverflow.com/questions/9766940/how-to-create-an-sql-view-with-sqlalchemy

Author: amotl

src/crate/client/sqlalchemy/doctests/reflection.txt

@@ -17,6 +17,14 @@ List all tables::
     >>> set(['checks', 'cluster', 'jobs', 'jobs_log']).issubset(inspector.get_table_names(schema='sys'))
     True
 
+List all views::
+
+    >>> inspector.get_view_names()
+    []
+
+    >>> inspector.get_view_names(schema='sys')
+    []
+
 Get default schema name::
 
     >>> inspector.default_schema_name

src/crate/client/sqlalchemy/tests/dialect_test.py

@@ -112,3 +112,14 @@ def test_get_table_names(self):
         eq_(insp.get_table_names(schema="doc"),
             ['t1', 't2'])
         in_("WHERE schema_name = ? ORDER BY", self.executed_statement)
+
+    def test_get_view_names(self):
+        fake_cursor.rowcount = 1
+        fake_cursor.fetchall = MagicMock(return_value=[["v1"], ["v2"]])
+
+        insp = inspect(self.character.metadata.bind)
+        self.engine.dialect.server_version_info = (2, 0, 0)
+        eq_(insp.get_view_names(schema="doc"),
+            ['v1', 'v2'])
+        eq_(self.executed_statement, "SELECT table_name FROM information_schema.views "
+                                     "ORDER BY table_name ASC, table_schema ASC")