diff --git a/test_me_on_student6.py b/test_me_on_student6.py
new file mode 100644
index 0000000000000000000000000000000000000000..9e6e723d8ea4d41e3a53021dca420bcb998d3c78
--- /dev/null
+++ b/test_me_on_student6.py
@@ -0,0 +1,53 @@
+import unittest
+from other.student6.Calculator_combined import StringCalculator  #lasse
+
+class TestStudent6OnMe(unittest.TestCase):
+    def setUp(self):
+        self.calc = StringCalculator()
+
+    def test_add_empty_string(self):
+        self.assertEqual(self.calc.add(""), 0)
+
+    def test_add_single_number(self):
+        self.assertEqual(self.calc.add("1"), 1)
+
+    def test_add_two_numbers(self):
+        self.assertEqual(self.calc.add("10,20"), 30)
+
+    def test_add_multiple_numbers(self):
+        self.assertEqual(self.calc.add("1,2,3"), 6)
+        self.assertEqual(self.calc.add("10,20,30,40"), 100)
+
+    def test_add_with_newline_separator(self):
+        self.assertEqual(self.calc.add("1\n2,3"), 6)
+        self.assertEqual(self.calc.add("10\n20\n30"), 60)
+
+    def test_add_single_negative_number(self):
+        with self.assertRaises(ValueError) as context:
+            self.calc.add("1,-2,3")
+        self.assertEqual(str(context.exception), "Negative nicht erlaubt: [-2]")
+
+    def test_add_multiple_negative_numbers(self):
+        with self.assertRaises(ValueError) as context:
+            self.calc.add("-10\n-20,-30")
+        self.assertEqual(str(context.exception), "Negative nicht erlaubt: [-10, -20, -30]")
+
+    def test_add_with_custom_delimiter(self):
+        self.assertEqual(self.calc.add("//;\n1;2"), 3)
+        self.assertEqual(self.calc.add("//x\n7x8\n9"), 24)
+
+    def test_invalid_custom_delimiter_format(self):
+        with self.assertRaises(ValueError):
+            self.calc.add("//;1;2")
+
+    def test_ignore_numbers_greater_than_1000(self):
+        self.assertEqual(self.calc.add("2,1001"), 2)
+        self.assertEqual(self.calc.add("1002,50200"), 0)
+
+    def test_add_with_custom_delimiter_multiple_characters(self):
+        self.assertEqual(self.calc.add("//[**]\n1**2**3"), 6)
+        self.assertEqual(self.calc.add("//[###]\n10###20###30"), 60)
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/test_student6_on_me.py b/test_student6_on_me.py
new file mode 100644
index 0000000000000000000000000000000000000000..f21ca8bd646ba99ee04df6e5ed6621b34820975c
--- /dev/null
+++ b/test_student6_on_me.py
@@ -0,0 +1,53 @@
+import unittest
+from my_string_calculator import StringCalculator  # lasse
+
+class TestStudent6OnMe(unittest.TestCase):
+    def setUp(self):
+        self.calc = StringCalculator()
+
+    def test_add_empty_string(self):
+        self.assertEqual(self.calc.add(""), 0)
+
+    def test_add_single_number(self):
+        self.assertEqual(self.calc.add("1"), 1)
+
+    def test_add_two_numbers(self):
+        self.assertEqual(self.calc.add("10,20"), 30)
+
+    def test_add_multiple_numbers(self):
+        self.assertEqual(self.calc.add("1,2,3"), 6)
+        self.assertEqual(self.calc.add("10,20,30,40"), 100)
+
+    def test_add_with_newline_separator(self):
+        self.assertEqual(self.calc.add("1\n2,3"), 6)
+        self.assertEqual(self.calc.add("10\n20\n30"), 60)
+
+    def test_add_single_negative_number(self):
+        with self.assertRaises(ValueError) as context:
+            self.calc.add("1,-2,3")
+        self.assertEqual(str(context.exception), "Negative nicht erlaubt: [-2]")
+
+    def test_add_multiple_negative_numbers(self):
+        with self.assertRaises(ValueError) as context:
+            self.calc.add("-10\n-20,-30")
+        self.assertEqual(str(context.exception), "Negative nicht erlaubt: [-10, -20, -30]")
+
+    def test_add_with_custom_delimiter(self):
+        self.assertEqual(self.calc.add("//;\n1;2"), 3)
+        self.assertEqual(self.calc.add("//x\n7x8\n9"), 24)
+
+    def test_invalid_custom_delimiter_format(self):
+        with self.assertRaises(ValueError):
+            self.calc.add("//;1;2")
+
+    def test_ignore_numbers_greater_than_1000(self):
+        self.assertEqual(self.calc.add("2,1001"), 2)
+        self.assertEqual(self.calc.add("1002,50200"), 0)
+
+    def test_add_with_custom_delimiter_multiple_characters(self):
+        self.assertEqual(self.calc.add("//[**]\n1**2**3"), 6)
+        self.assertEqual(self.calc.add("//[###]\n10###20###30"), 60)
+
+
+if __name__ == "__main__":
+    unittest.main()