missingnotice_test: Test article query

Issue #64 (#64)

tests/missingnotice_tests.py

@@ -37,7 +37,22 @@ class TestMissingNoticeBot(unittest.TestCase):
     """
     Test class MissingNoticeBot
     """
-    pass
+
+    @mock.patch( 'sqlalchemy.engine.Engine.execute',
+                 return_value=( { "page_title": b"a", },
+                                { "page_title": b"b", },
+                                { "page_title": b"c", },
+                                { "page_title": b"d", }, ) )
+    def test_get_categorized_articles(self, execute_mock):
+        """
+        Test method get_categorized_articles()
+        """
+        self.assertFalse(execute_mock.called)
+
+        result = MissingNoticeBot.get_categorized_articles()
+
+        self.assertTrue(execute_mock.called)
+        self.assertEqual(result, ["a", "b", "c", "d"] )
 
 
 if __name__ == '__main__':