diff --git a/README.md b/README.md
index 0152bed..47056a2 100644
--- a/README.md
+++ b/README.md
@@ -17,4 +17,15 @@ Repository for CDS-2020 Programming and Promt Engineering II
 # Codewars
 |Title|Source (src/codewars/)|Test (test/codewars/)|URL|
 |-|-|-|-|
-|Find the force of gravity between two objects|kata_force_of_gravity.py|test_force_of_gravity.py|[URL](https://www.codewars.com/kata/5b609ebc8f47bd595e000627/)|
+|Find the force of gravity between two objects|kata_force_of_gravity.py|test_force_of_gravity.py|[5b609ebc8f47bd595e000627](https://www.codewars.com/kata/5b609ebc8f47bd595e000627)|
+|The Lamp: Revisited|kata_the_lamp.py|test_the_lamp.py|[570e6e32de4dc8a8340016dd](https://www.codewars.com/kata/570e6e32de4dc8a8340016dd)|
+|OOP: Object Oriented Piracy|kata_object_oriented_piracy.py|test_object_oriented_piracy.py|[54fe05c4762e2e3047000add](https://www.codewars.com/kata/54fe05c4762e2e3047000add)|
+|Vigenère Cipher Helper|kata_vigenere_cipher_helper.py|test_vigenere_cipher_helper.py|[52d1bd3694d26f8d6e0000d3](https://www.codewars.com/kata/52d1bd3694d26f8d6e0000d3)|
+|Caesar Cipher Helper|kata_ceasar_cipher_helper.py|test_ceasar_cipher_helper.py|[526d42b6526963598d0004db](https://www.codewars.com/kata/526d42b6526963598d0004db)|
+|Versions manager|kata_version_mamanger.py|test_version_manager.py|[5bc7bb444be9774f100000c3](https://www.codewars.com/kata/5bc7bb444be9774f100000c3)|
+|Thinkful - Object Drills: Quarks|kata_thinkful_quarks.py|test_thinkful_quarks.py|[5882b052bdeafec15e0000e6](https://www.codewars.com/kata/5882b052bdeafec15e0000e6)|
+|Thinkful - Object Drills: Vectors|kata_thinkful_vectors.py|test_thinkful_vectors.py|[587f1e1f39d444cee6000ad4](https://www.codewars.com/kata/587f1e1f39d444cee6000ad4)|
+|Building blocks|kata_building_blocks.py|test_building_blocks.py|[55b75fcf67e558d3750000a3](https://www.codewars.com/kata/55b75fcf67e558d3750000a3)|
+|PaginationHelper|kata_pagination_helper.py|test_pagination_helper.py|[515bb423de843ea99400000a](https://www.codewars.com/kata/515bb423de843ea99400000a)|
+|Who has the most money?|kata_who_the_most_money.py|test_who_the_most_money.py|[528d36d7cc451cd7e4000339](https://www.codewars.com/kata/528d36d7cc451cd7e4000339)|
+|Next bigger number with the same digits|kata_next_bigger_number_same_digits.py|test_next_bigger_number_same_digits.py|[55983863da40caa2c900004e](https://www.codewars.com/kata/55983863da40caa2c900004e)|
diff --git a/src/codewars/kata_building_blocks.py b/src/codewars/kata_building_blocks.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/codewars/kata_ceasar_cipher_helper.py b/src/codewars/kata_ceasar_cipher_helper.py
new file mode 100644
index 0000000..f9d6643
--- /dev/null
+++ b/src/codewars/kata_ceasar_cipher_helper.py
@@ -0,0 +1,28 @@
+class CaesarCipher(object):
+    def __init__(self, shift):
+        self.shift = shift
+        self.alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+
+    def encode(self, text):
+        idx_alph = [
+            self.alphabet.index(x) if x in self.alphabet else x for x in text.upper()
+        ]
+        idx_shift = [
+            (x + self.shift) % len(self.alphabet) if isinstance(x, (int)) else x
+            for x in idx_alph
+        ]
+        return "".join(
+            [self.alphabet[x] if isinstance(x, (int)) else x for x in idx_shift]
+        )
+
+    def decode(self, text):
+        idx_alph = [
+            self.alphabet.index(x) if x in self.alphabet else x for x in text.upper()
+        ]
+        idx_shift = [
+            (x - self.shift) % len(self.alphabet) if isinstance(x, (int)) else x
+            for x in idx_alph
+        ]
+        return "".join(
+            [self.alphabet[x] if isinstance(x, (int)) else x for x in idx_shift]
+        )
diff --git a/src/codewars/kata_next_bigger_number_same_digits.py b/src/codewars/kata_next_bigger_number_same_digits.py
new file mode 100644
index 0000000..59469d3
--- /dev/null
+++ b/src/codewars/kata_next_bigger_number_same_digits.py
@@ -0,0 +1,31 @@
+def next_bigger(n):
+    # get number as digits in list
+    digits = [int(x) for x in list(str(n))]
+
+    # find index of pivot. return -1 if there is no pivot, meaning number is alreadig biggest
+    pivot = -1
+    for i in range(1, len(digits)):
+        if digits[-i] > digits[-i - 1]:
+            pivot = -i - 1
+            break
+
+    if pivot == -1:
+        return -1
+
+    # find the smallest digit to the right that is bigger than the pivot
+    right = digits[pivot + 1 :]
+    swap = right.index(min([x for x in right if x > digits[pivot]]))
+
+    # swap pivot with found digit
+    digits[pivot], digits[len(digits) - len(right) + swap] = (
+        right[swap],
+        digits[pivot],
+    )
+
+    # sort right side of new swapped pivot and replace it at the end
+    right = digits[pivot + 1 :]
+    right.sort()
+    digits[pivot + 1 :] = right
+
+    # return number
+    return int("".join([str(x) for x in digits]))
diff --git a/src/codewars/kata_object_oriented_piracy.py b/src/codewars/kata_object_oriented_piracy.py
new file mode 100644
index 0000000..4300254
--- /dev/null
+++ b/src/codewars/kata_object_oriented_piracy.py
@@ -0,0 +1,7 @@
+class Ship:
+    def __init__(self, draft, crew):
+        self.draft = draft
+        self.crew = crew
+
+    def is_worth_it(self):
+        return self.draft - self.crew * 1.5 > 20
diff --git a/src/codewars/kata_pagination_helper.py b/src/codewars/kata_pagination_helper.py
new file mode 100644
index 0000000..98eb598
--- /dev/null
+++ b/src/codewars/kata_pagination_helper.py
@@ -0,0 +1,46 @@
+class PaginationHelper:
+
+    # The constructor takes in an array of items and an integer indicating
+    # how many items fit within a single page
+    def __init__(self, collection, items_per_page):
+        self.collection = collection
+        self.items_per_page = items_per_page
+
+    # returns the number of items within the entire collection
+    def item_count(self):
+        return len(self.collection)
+
+    # returns the number of pages
+    def page_count(self):
+        return int(len(self.collection) / self.items_per_page) + (
+            len(self.collection) % self.items_per_page > 0
+        )
+
+    # returns the number of items on the given page. page_index is zero based
+    # this method should return -1 for page_index values that are out of range
+    def page_item_count(self, page_index):
+        if page_index < 0 or self.page_count() - 1 < page_index:
+            return -1
+
+        if page_index == 0:
+            return len(self.collection[: self.items_per_page])
+
+        return len(
+            self.collection[
+                self.items_per_page * page_index : self.items_per_page * page_index
+                + self.items_per_page
+            ]
+        )
+
+    # determines what page an item at the given index is on. Zero based indexes.
+    # this method should return -1 for item_index values that are out of range
+    def page_index(self, item_index):
+        try:
+            self.collection[item_index]
+
+            if item_index < 0:
+                raise IndexError
+        except IndexError:
+            return -1
+
+        return item_index // self.items_per_page
diff --git a/src/codewars/kata_the_lamp.py b/src/codewars/kata_the_lamp.py
new file mode 100644
index 0000000..418a8f6
--- /dev/null
+++ b/src/codewars/kata_the_lamp.py
@@ -0,0 +1,13 @@
+class Lamp:
+
+    def __init__(self, color: str):
+        self.color = color
+        self.on = False
+
+    def toggle_switch(self):
+        self.on = not self.on
+
+    def state(self):
+        if self.on:
+            return "The lamp is on."
+        return "The lamp is off."
diff --git a/src/codewars/kata_thinkful_quarks.py b/src/codewars/kata_thinkful_quarks.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/codewars/kata_thinkful_vectors.py b/src/codewars/kata_thinkful_vectors.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/codewars/kata_version_mamanger.py b/src/codewars/kata_version_mamanger.py
new file mode 100644
index 0000000..e32722e
--- /dev/null
+++ b/src/codewars/kata_version_mamanger.py
@@ -0,0 +1,47 @@
+class VersionManager:
+    def __init__(self, version=None):
+        if not version:
+            version = "0.0.1"
+
+        parts = version.split(".")[:3]
+
+        if not all(p.isdecimal() for p in parts):
+            raise ValueError("Error occured while parsing version!")
+
+        nums = [int(p) for p in parts]
+
+        while len(nums) < 3:
+            nums.append(0)
+
+        self.major_v, self.minor_v, self.patch_v = nums
+        self.history = []
+
+    def _save(self):
+        self.history.append((self.major_v, self.minor_v, self.patch_v))
+
+    def major(self):
+        self._save()
+        self.major_v += 1
+        self.minor_v = 0
+        self.patch_v = 0
+        return self
+
+    def minor(self):
+        self._save()
+        self.minor_v += 1
+        self.patch_v = 0
+        return self
+
+    def patch(self):
+        self._save()
+        self.patch_v += 1
+        return self
+
+    def rollback(self):
+        if not self.history:
+            raise Exception("Cannot rollback!")
+        self.major_v, self.minor_v, self.patch_v = self.history.pop()
+        return self
+
+    def release(self):
+        return f"{self.major_v}.{self.minor_v}.{self.patch_v}"
diff --git a/src/codewars/kata_vigenere_cipher_helper.py b/src/codewars/kata_vigenere_cipher_helper.py
new file mode 100644
index 0000000..3d53b5d
--- /dev/null
+++ b/src/codewars/kata_vigenere_cipher_helper.py
@@ -0,0 +1,40 @@
+class VigenereCipher(object):
+    def __init__(self, key, alphabet):
+        self.key = key
+        self.alphabet = alphabet
+
+    def encode(self, text):
+        encoded = []
+        idx_key = 0
+
+        for char in text:
+            if char in self.alphabet:
+                text_pos = self.alphabet.index(char)
+                key_char = self.key[idx_key % len(self.key)]
+                key_pos = self.alphabet.index(key_char)
+
+                pos = (text_pos + key_pos) % len(self.alphabet)
+                encoded.append(self.alphabet[pos])
+            else:
+                encoded.append(char)
+            idx_key += 1
+
+        return "".join(encoded)
+
+    def decode(self, text):
+        decoded = []
+        idx_key = 0
+
+        for char in text:
+            if char in self.alphabet:
+                text_pos = self.alphabet.index(char)
+                key_char = self.key[idx_key % len(self.key)]
+                key_pos = self.alphabet.index(key_char)
+
+                pos = (text_pos - key_pos) % len(self.alphabet)
+                decoded.append(self.alphabet[pos])
+            else:
+                decoded.append(char)
+            idx_key += 1
+
+        return "".join(decoded)
diff --git a/src/codewars/kata_who_the_most_money.py b/src/codewars/kata_who_the_most_money.py
new file mode 100644
index 0000000..a521421
--- /dev/null
+++ b/src/codewars/kata_who_the_most_money.py
@@ -0,0 +1,15 @@
+class Student:
+    def __init__(self, name, fives, tens, twenties):
+        self.name = name
+        self.fives = fives
+        self.tens = tens
+        self.twenties = twenties
+
+
+def most_money(students):
+    student_names = [x.name for x in students]
+    student_money = [x.fives * 5 + x.tens * 10 + x.twenties * 20 for x in students]
+
+    if len(set(student_money)) == 1 and len(student_money) > 1:
+        return "all"
+    return max(list(zip(student_names, student_money)), key=lambda x: x[1])[0]
diff --git a/src/tutorial/class/animal.py b/src/tutorial/class/animal.py
new file mode 100644
index 0000000..77a7406
--- /dev/null
+++ b/src/tutorial/class/animal.py
@@ -0,0 +1,32 @@
+from abc import ABC, abstractmethod
+
+
+class Animal(ABC):
+    @abstractmethod
+    def speak(slef) -> str:
+        return "..."
+
+    def chorus(self, n: int) -> str:
+        # Wiederhole den Laut n-mal als eine Zeile"
+        if n <= 0:
+            raise ValueError("n muss positiv sein")
+        return " ".join(self.speak() for _ in range(n))
+
+
+class Dog(Animal):
+    def speak(self) -> str:
+        return "wuff"
+
+
+class Cat(Animal):
+    def speak(self) -> str:
+        return "miau"
+
+
+class Cow(Animal):
+    def speak(self) -> str:
+        return "muh"
+
+
+cow = Cow()
+print(cow.chorus(3))
diff --git a/src/tutorial/class/hund.py b/src/tutorial/class/hund.py
index 129deb9..d47423f 100644
--- a/src/tutorial/class/hund.py
+++ b/src/tutorial/class/hund.py
@@ -1,41 +1,88 @@
-class Hund:
+from abc import ABC, abstractmethod
+
+
+class Hund(ABC):
     anzahl_hunde = 0
 
-    def __init__(self, name: str, rasse: str, alter: int, gewicht: float):
+    def __init__(self, name: str, alter: int, gewicht: float, bellgeraeusch: str):
         self.name = name
-        self.rasse = rasse
         self.alter = alter
         self.gewicht = gewicht
+        self.bellgeraeusch = bellgeraeusch
         Hund.anzahl_hunde += 1
 
-    def __repr__(self):
-        return f"Hund(name={self.name!r}, rasse={self.rasse}, alter={self.alter}, gewicht={self.gewicht}"
+    def __repr__(self) -> str:
+        return f"Hund(name={self.name!r}, rasse={self.__class__.__name__}, alter={self.alter}, gewicht={self.gewicht}"
 
-    def __str__(self):
-        return f"{self.name} ist ein {self.alter}-jähriger {self.rasse}"
+    def __str__(self) -> str:
+        return f"{self.name} ist ein {self.alter}-jähriger {self.__class__.__name__}"
 
-    def bellen(self, n=1) -> int:
-        print(n * "Woof! ")
+    @abstractmethod
+    def bellen(self, n: int = 1) -> None:
+        print(" ".join([self.bellgeraeusch] * n))
 
-    def geburtstag(self):
+    def geburtstag(self) -> None:
         self.alter += 1
         print(
             f"Alles Gute zum Geburtstag, {self.name}! Du bist jetzt {self.alter} Jahre alt."
         )
 
-    def ist_welpe(self):
+    def ist_welpe(self) -> None:
         if self.alter < 2:
             print(f"{self.name} ist ein {self.alter}-jähriger Welpe")
         else:
             print(f"{self.name} ist ein {self.alter}-jähriger erwachsener Hund")
 
+    def __lt__(self, other):  # less than: self < other
+        return self.alter < other.alter
 
-hund1 = Hund(name="Bello", rasse="Pudel", alter=99, gewicht=357)
-hund2 = Hund(name="Dewy", rasse="Labrador", alter=-6, gewicht=1)
+    def __le__(self, other):  # less equal: self <= other
+        return self.alter <= other.alter
+
+    def __gt__(self, other):  # greater than: self > other
+        return self.alter > other.alter
+
+    def __ge__(self, other):  # greater equal: self >= other
+        return self.alter >= other.alter
+
+    def __eq__(self, other):  # equal: self == other
+        return self.alter == other.alter
+
+
+class Pudel(Hund):
+    def __init__(self, name, alter, gewicht):
+        super().__init__(name, alter, gewicht, "wau")
+
+    def bellen(self, n=1):
+        super().bellen(n)
+
+
+class Labrador(Hund):
+    def __init__(self, name, alter, gewicht):
+        super().__init__(name, alter, gewicht, "wuff")
+
+    def bellen(self, n=1):
+        super().bellen(n)
+
+
+class Bulldog(Hund):
+    def __init__(self, name, alter, gewicht):
+        super().__init__(name, alter, gewicht, "woff")
+
+    def bellen(self, n=1):
+        super().bellen(n)
+
+
+hund1 = Labrador(name="Bello", alter=33, gewicht=27)
+hund2 = Pudel(name="Dewy", alter=6, gewicht=1)
+hund3 = Bulldog(name="Stone", alter=15, gewicht=1000)
 
 print(repr(hund1))
 print(hund2)
 hund2.bellen(3)
+hund1.bellen(2)
 hund1.geburtstag()
 hund2.ist_welpe()
 hund1.ist_welpe()
+hund3.bellen(4)
+print(hund3 > hund2)
diff --git a/src/tutorial/class/mro_tutorial.py b/src/tutorial/class/mro_tutorial.py
new file mode 100644
index 0000000..715035d
--- /dev/null
+++ b/src/tutorial/class/mro_tutorial.py
@@ -0,0 +1,17 @@
+class A:
+    pass
+
+
+class B(A):
+    pass
+
+
+class C(A):
+    pass
+
+
+class D(B, C):
+    pass
+
+
+print(D.mro())
diff --git a/src/tutorial/class/robot.py b/src/tutorial/class/robot.py
new file mode 100644
index 0000000..a4ab031
--- /dev/null
+++ b/src/tutorial/class/robot.py
@@ -0,0 +1,21 @@
+class Dog:
+    def speak(self) -> str:
+        return "wuff"
+
+
+class Cat:
+    def speak(self) -> str:
+        return "miau"
+
+
+class Robot:
+    def speak(self) -> str:
+        return "bip bup"
+
+
+def chorus(animals) -> list:
+    for a in animals:
+        print(a.speak())
+
+
+chorus([Dog(), Cat(), Robot()])
diff --git a/src/tutorial/class/storage.py b/src/tutorial/class/storage.py
new file mode 100644
index 0000000..a6859db
--- /dev/null
+++ b/src/tutorial/class/storage.py
@@ -0,0 +1,27 @@
+from abc import ABC, abstractmethod
+
+
+class Storage(ABC):
+    @abstractmethod
+    def save(self, key: str, value: str) -> None:
+        pass
+
+    @abstractmethod
+    def load(self, key: str) -> str:
+        pass
+
+
+class MemoryStorage(Storage):
+    def __init__(self) -> None:
+        self.storage = {}
+
+    def save(self, key: str, value: str) -> None:
+        self.storage[key] = value
+
+    def load(self, key):
+        return self.storage[key]
+
+
+s = MemoryStorage()
+s.save("randomkey", "My Value")
+print(s.load("randomkey"))
diff --git a/tests/codewars/test_building_blocks.py b/tests/codewars/test_building_blocks.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/codewars/test_ceasar_cipher_helper.py b/tests/codewars/test_ceasar_cipher_helper.py
new file mode 100644
index 0000000..70efd3b
--- /dev/null
+++ b/tests/codewars/test_ceasar_cipher_helper.py
@@ -0,0 +1,8 @@
+from src.codewars.kata_ceasar_cipher_helper import CaesarCipher
+
+
+def test_cipher_helper():
+    c = CaesarCipher(5)
+
+    assert c.encode("Codewars") == "HTIJBFWX"
+    assert c.decode("HTIJBFWX") == "CODEWARS"
diff --git a/tests/codewars/test_next_bigger_number_same_digits.py b/tests/codewars/test_next_bigger_number_same_digits.py
new file mode 100644
index 0000000..a1793a5
--- /dev/null
+++ b/tests/codewars/test_next_bigger_number_same_digits.py
@@ -0,0 +1,15 @@
+from src.codewars.kata_next_bigger_number_same_digits import next_bigger
+
+
+def test_next_bigger():
+    assert next_bigger(12) == 21
+    assert next_bigger(21) == -1
+    assert next_bigger(513) == 531
+    assert next_bigger(2017) == 2071
+    assert next_bigger(414) == 441
+    assert next_bigger(144) == 414
+    assert next_bigger(1234567890) == 1234567908
+    assert next_bigger(59884848459853) == 59884848483559
+    assert next_bigger(7600201336) == 7600201363
+    assert next_bigger(5113455566888) == 5113455568688
+    assert next_bigger(4769560370633) == 4769560373036
diff --git a/tests/codewars/test_object_oriented_piracy.py b/tests/codewars/test_object_oriented_piracy.py
new file mode 100644
index 0000000..61f4872
--- /dev/null
+++ b/tests/codewars/test_object_oriented_piracy.py
@@ -0,0 +1,15 @@
+from src.codewars.kata_object_oriented_piracy import Ship
+
+
+def test_piracy():
+    empty_ship = Ship(0, 0)
+    assert not empty_ship.is_worth_it()
+
+    boat = Ship(15, 20)
+    assert not boat.is_worth_it()
+
+    worthy_ship = Ship(100, 20)
+    assert worthy_ship.is_worth_it()
+
+    big_boat = Ship(35, 20)
+    assert not big_boat.is_worth_it()
diff --git a/tests/codewars/test_pagination_helper.py b/tests/codewars/test_pagination_helper.py
new file mode 100644
index 0000000..12f3185
--- /dev/null
+++ b/tests/codewars/test_pagination_helper.py
@@ -0,0 +1,27 @@
+from src.codewars.kata_pagination_helper import PaginationHelper
+
+
+def test_pagination():
+    collection = ["a", "b", "c", "d", "e", "f"]
+    helper = PaginationHelper(collection, 4)
+
+    assert helper.page_count() == 2
+    assert helper.item_count() == 6
+    assert helper.page_item_count(0) == 4
+    assert helper.page_item_count(1) == 2
+    assert helper.page_item_count(2) == -1
+    assert helper.page_index(5) == 1
+    assert helper.page_index(2) == 0
+    assert helper.page_index(20) == -1
+    assert helper.page_index(-10) == -1
+
+    empty = PaginationHelper([], 10)
+
+    assert empty.item_count() == 0
+    assert empty.page_count() == 0
+    assert empty.page_index(0) == -1
+    assert empty.page_index(1) == -1
+    assert empty.page_index(-1) == -1
+    assert empty.page_item_count(0) == -1
+    assert empty.page_item_count(1) == -1
+    assert empty.page_item_count(-1) == -1
diff --git a/tests/codewars/test_the_lamp.py b/tests/codewars/test_the_lamp.py
new file mode 100644
index 0000000..811cec0
--- /dev/null
+++ b/tests/codewars/test_the_lamp.py
@@ -0,0 +1,13 @@
+from src.codewars.kata_the_lamp import Lamp
+
+
+def test_lamp():
+    my_lamp = Lamp("Blue")
+
+    assert my_lamp.color == "Blue"
+    assert not my_lamp.on
+    assert my_lamp.state() == "The lamp is off."
+    my_lamp.toggle_switch()
+    assert my_lamp.state() == "The lamp is on."
+    my_lamp.toggle_switch()
+    assert my_lamp.state() == "The lamp is off."
diff --git a/tests/codewars/test_thinkful_quarks.py b/tests/codewars/test_thinkful_quarks.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/codewars/test_thinkful_vectors.py b/tests/codewars/test_thinkful_vectors.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/codewars/test_version_manager.py b/tests/codewars/test_version_manager.py
new file mode 100644
index 0000000..fb9c76b
--- /dev/null
+++ b/tests/codewars/test_version_manager.py
@@ -0,0 +1,7 @@
+from src.codewars.kata_version_mamanger import VersionManager
+
+
+def test_lamp():
+    v = VersionManager("1.1.1")
+
+    assert v.release() == "1.1.1"
diff --git a/tests/codewars/test_vigenere_cipher_helper.py b/tests/codewars/test_vigenere_cipher_helper.py
new file mode 100644
index 0000000..a851339
--- /dev/null
+++ b/tests/codewars/test_vigenere_cipher_helper.py
@@ -0,0 +1,16 @@
+from src.codewars.kata_vigenere_cipher_helper import VigenereCipher
+
+
+def test_cipher_helper():
+    abc = "abcdefghijklmnopqrstuvwxyz"
+    key = "password"
+    c = VigenereCipher(key, abc)
+
+    assert c.encode("codewars") == "rovwsoiv"
+    assert c.decode("rovwsoiv") == "codewars"
+
+    assert c.encode("waffles") == "laxxhsj"
+    assert c.decode("laxxhsj") == "waffles"
+
+    assert c.encode("CODEWARS") == "CODEWARS"
+    assert c.decode("CODEWARS") == "CODEWARS"
diff --git a/tests/codewars/test_who_the_most_money.py b/tests/codewars/test_who_the_most_money.py
new file mode 100644
index 0000000..f7aeeff
--- /dev/null
+++ b/tests/codewars/test_who_the_most_money.py
@@ -0,0 +1,15 @@
+from src.codewars.kata_who_the_most_money import Student, most_money
+
+
+def test_most_money():
+    phil = Student("Phil", 2, 2, 1)
+    cam = Student("Cameron", 2, 2, 0)
+    geoff = Student("Geoff", 0, 3, 0)
+
+    assert most_money([cam, geoff, phil]) == "Phil"
+
+    phil = Student("Phil", 2, 2, 2)
+    cam = Student("Cameron", 2, 2, 2)
+    geoff = Student("Geoff", 2, 2, 2)
+
+    assert most_money([cam, geoff, phil]) == "all"