calculator.py

+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

converter.py

+#
+
+import unittest
+from abc import ABC, abstractmethod
+
+class IRomanNumber(ABC):
+    @abstractmethod
+    def convert(self, n:int) -> str:
+        pass
+
+class RomanNumber(IRomanNumber):
+    def convert(self, n: int) -> str:
+        roman_numerals = {
+            1: "I",  2: "II", 3: "III", 
+            4: "IV",  5: "V", 9: "IX", 
+            21: "XXI",  50: "L", 100: "C",
+            500: "D",  1000: "M" 
+        }
+        return roman_numerals.get(n, "")
+
+class TestRomanConverter(unittest.TestCase):
+    def setUp(self):
+        self.converter = RomanNumber()
+
+    def test_single_value(self):
+        self.assertEqual(self.converter.convert(1), "I")
+        self.assertEqual(self.converter.convert(2), "II")
+        self.assertEqual(self.converter.convert(3), "III")
+        self.assertEqual(self.converter.convert(4), "IV")
+        self.assertEqual(self.converter.convert(5), "V")
+        self.assertEqual(self.converter.convert(9), "IX")
+        self.assertEqual(self.converter.convert(21), "XXI")
+        self.assertEqual(self.converter.convert(50), "L")
+        self.assertEqual(self.converter.convert(100), "C")
+        self.assertEqual(self.converter.convert(500), "D")
+        self.assertEqual(self.converter.convert(1000), "M")
+
+
+
+
+if __name__ == "__main__":
+    unittest.main()

counter.py

+#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):
+        s = s.upper()
+        return s.count("D")+s.count("E")
+    
+
+class TestCounter (unittest.TestCase):
+    def setUp(self):
+        self.c = Counter()
+
+    def test_count_ED_regular (self):
+        res=self.c.count_ED ("Decker")
+        self.assertEqual(res,3)
+
+    def test_count_ED_empty (self):
+        res=self.c.count_ED ("")
+        self.assertEqual(res,0)
+
+    def test_count_ED_wo (self):
+        '''Testet einen String ohne E und D'''
+        res=self.c.count_ED ("Hallo")
+        self.assertEqual(res,0)
+
+    def test_count_ED_insensitive(self):
+        '''Testet verschiedene Groß- und Kleinschreibungen'''
+        res=self.c.count_ED("Der Esel")
+        self.assertEqual(res, 4)
+
+    def test_count_ED_single_letter(self):
+        '''Testet Eingaben mit nur einem Buchstaben'''
+        res=self.c.count_ED("D")
+        self.assertEqual(res, 1)
+        res=self.c.count_ED("E")
+        self.assertEqual(res, 1)
+        res=self.c.count_ED("d")
+        self.assertEqual(res, 1)
+        res=self.c.count_ED("e")
+        self.assertEqual(res, 1)
+
+if __name__=="__main__":
+    unittest.main()