negative strings and added setup method

String calculator

@@ -2,6 +2,17 @@
 #test no string
 #test add 1 string
 #test adding 2 strings
+
+#add 3 strings
+#add 4 strings
+#add 6 strings
+
+#\n statt , bei 2 strings
+#\n statt , bei mehreren strings
+
+# eine negative zahl
+# mehrere negative zahlen
+
 import unittest
 
 class StringCalculator:
@@ -9,25 +20,47 @@ class StringCalculator:
         if not numbers:
             return 0
         else:
+            numbers = numbers.replace('\n',',')
             number_list = numbers.split(',')#aufteilung der strings
-            if len(number_list) ==1:
-                return int(number_list[0])#bei einem string wird er in int umgewandelt
-            elif len(number_list)==2:
-                return int(number_list[0])+ int(number_list[1])#bei 2 strings wird beides in int verwandelt und die summe zurück gegeben(Position 1/0+Position 2/1)
-            return 0
+            negative=[] #array für die negativen nummern
+            total_sum = 0
+            for number_str in number_list: #jedes element in der liste wird durch genommen
+                if number_str:
+                    number = int(number_str)# summierung der integer
+                    if number <0:
+                        negative.append(number)
+                    total_sum += number
+
+            if negative:
+                    print(f"Negative Zahlen:{negative} ")#ausgabe negative zahlen
+                    raise ValueError(f"negatives not allowed: {','.join(map(str, negative))}")
+                
+            return total_sum
         
     
 class TestStingCalculator(unittest.TestCase):
+    def setUp(self):
+        self.calculator = StringCalculator()     
     def test_empty_string(self):
-        calculator = StringCalculator()
-        self.assertEqual(calculator.add(""), 0) #leerer string + 0
+        self.assertEqual(self.calculator.add(""), 0) #leerer string + 0
     def test_single_number(self):
-        calculator = StringCalculator()
-        self.assertEqual(calculator.add("5"),5) #eingabe von einem String
+        self.assertEqual(self.calculator.add("5"),5) #eingabe von einem String
     def test_multiple_numbers(self):
-        calculator=StringCalculator()
-        self.assertEqual(calculator.add("5,5"),10)#eingabe mehrere strings
+        self.assertEqual(self.calculator.add("5,5"),10)#eingabe mehrere strings
+    def test_unknowen_amount_of_numbers(self):
+        self.assertEqual(self.calculator.add("1,2,3"),6)
+        self.assertEqual(self.calculator.add("10,20,30,40"),100)
+        self.assertEqual(self.calculator.add("1,2,3,4,5,6"),21)
+    def test_numbers_seperated_by_newline(self):
+        self.assertEqual(self.calculator.add("1\n2"),3)
+        self.assertEqual(self.calculator.add("1\n2\n3"),6)
+        self.assertEqual(self.calculator.add("10,20\n30"),60)
+
+    def test_negative_number_exception(self):
+
+        with self.assertRaises(ValueError) as e:
+            self.calculator.add("-1,2")
+        self.assertEqual(str(e.exception), "negatives not allowed: -1")
 
 if __name__=='__main__':
-    unittest.main()
-    
+    unittest.main()
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