delim aa

String calculator

@@ -127,6 +127,8 @@ class TestStingCalculator(unittest.TestCase):
         self.assertEqual(self.calculator.add("//[***]\n1***2***3"),6)
     def test_custom_del(self):
         self.assertEqual(self.calculator.add("//[+++]\n1+++2+++3"),6)
+    def test_custom_del2(self):
+        self.assertEqual(self.calculator.add("//[aa]\n1aa2aa3"),6)