diff --git a/test_string_calculator.py b/test_string_calculator.py
new file mode 100644
index 0000000000000000000000000000000000000000..2f97d1a660d0f1fd00c47d29163b0ecd709b35d8
--- /dev/null
+++ b/test_string_calculator.py
@@ -0,0 +1,34 @@
+import unittest
+from string_calculator import StringCalculator
+
+class TestStringCalculator(unittest.TestCase):
+    """Test suite for the StringCalculator class."""
+
+    def setUp(self):
+        """neue Instanz des StringCalculators vor jedem Test """
+        self.calculator = StringCalculator()
+    def test_empty_string_returns_zero(self):
+        
+        """Test: Leerer String soll 0 ergeben"""
+        self.assertEqual(self.calculator.add(""), 0)
+
+    def test_single_number_returns_value(self):
+        
+        """Test: Ein einzelner Wert soll zurückgegeben werden"""
+        self.assertEqual(self.calculator.add("1"), 1)
+
+    def test_two_numbers_return_sum(self):
+       
+        """Test: Zwei Zahlen sollen summiert werden"""
+        self.assertEqual(self.calculator.add("1,2"), 3)
+    
+
+       
+     
+
+
+
+
+
+        
+