diff --git a/calculator.py b/calculator.py
new file mode 100644
index 0000000000000000000000000000000000000000..79532fcf5edde813fe1f73aa5077023520b017f2
--- /dev/null
+++ b/calculator.py
@@ -0,0 +1,13 @@
+import unittest
+
+class Calculator:
+    def add(self, a, b):
+        return a + b
+
+class TestCalculator(unittest.TestCase):
+    def test_add(self):
+        c = Calculator()
+        self.assertEqual(c.add(2,3), 5)
+
+if __name__ == '__main__':
+    unittest.main()
\ No newline at end of file
diff --git a/counter.py b/counter.py
new file mode 100644
index 0000000000000000000000000000000000000000..f6ee3bb865d651fd9c93a7faa2daf9851732b86e
--- /dev/null
+++ b/counter.py
@@ -0,0 +1,35 @@
+#Bei Einhabe des Strings "Decker" liefert die Funktion 3
+#Bei Eingabe eines leeren Strings soll 0 ausgegeben werden
+#Bei Eingabe des Strings "Hallo" ohne E und D soll 0 ausgegeben werden
+
+from abc import ABC,abstractmethod
+import unittest
+
+class ICounter (ABC):
+    @abstractmethod
+    def count_ED(self,s):
+        pass
+
+class Counter (ICounter):
+    #def count_ED(self,s):
+    #return s.count("e")+s.count("D")
+    pass
+
+class TestCounter (unittest.TestCase):
+    def test_count_ED_regular (self):
+        c=Counter()
+        res=c.count_ED ("Decker")
+        self.assertEqual(res,3)
+    def test_count_ED_empty (self):
+        c=Counter()
+        res=c.count_ED ("")
+        self.assertEqual(res,0)
+    def test_count_ED_wo (self):
+        '''Testet einen String ohne E und D'''
+        c=Counter()
+        res=c.count_ED ("Hallo")
+        self.assertEqual(res,0)
+    
+
+if __name__=="__main__":
+    unittest.main()
diff --git a/test.py b/test.py
new file mode 100644
index 0000000000000000000000000000000000000000..d40dcf92e86fa7d9cc3fa3f3309aa5d30b9a311e
--- /dev/null
+++ b/test.py
@@ -0,0 +1,5 @@
+#Meine Ãœbung, um es zu verstehen!
+class Employee:
+    def __init__(self, name, age):
+        self.name = name
+        self.age = age
\ No newline at end of file