diff --git a/__pycache__/s2_a4_a.cpython-311.pyc b/__pycache__/s2_a4_a.cpython-311.pyc
new file mode 100644
index 0000000..5c2f15a
Binary files /dev/null and b/__pycache__/s2_a4_a.cpython-311.pyc differ
diff --git a/s2_a4_b.py b/s2_a4_b.py
index 9d4f95d..8168465 100644
--- a/s2_a4_b.py
+++ b/s2_a4_b.py
@@ -1,2 +1,33 @@
 import unittest
-import s2_a4_a
\ No newline at end of file
+import s2_a4_a
+
+test_numbers = [
+    "+1 223-456-7890",
+    "1-223-456-7890",
+    "+1 223 456-7890",
+    "(223) 456-7890",
+    "1 223 456 7890",
+    "223.456.7890",
+    "1-989-111-2222",
+    ]
+
+test_results = [
+    "1-223-456-7890"
+
+]
+
+class Test_Normalizer(unittest.TestCase):
+    
+    
+    def test1(self):
+        input = s2_a4_a.normalize(test_numbers[0])
+        output = test_results[0]
+        self.assertEqual(input, output)
+       
+
+    def test2(self):
+        self.assertRaises(ValueError, s2_a4_a.normalize, "Gehen Strings fit bre?")
+        
+
+if __name__ == '__main__':
+    unittest.main()