diff --git a/stringCalculator.py b/stringCalculator.py
index 417673fe09651b7415d33fe498c72fed5ebb1a86..66c445eab0b34851a92a4a9c5eec67d43b0f3b98 100644
--- a/stringCalculator.py
+++ b/stringCalculator.py
@@ -148,5 +148,9 @@ class TestStringCalculator(unittest.TestCase):
         res = self.c.add(" 2, 1001, 5")
         self.assertEqual(res, 7)
 
+    def test_empty_text(self):
+        res = self.c.add("//;\n")
+        self.assertEqual(res, 0)
+
 if __name__ == "__main__":
     unittest.main()
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