diff --git a/bun.py b/praktikum/bun.py
similarity index 100%
rename from bun.py
rename to praktikum/bun.py
diff --git a/burger.py b/praktikum/burger.py
similarity index 100%
rename from burger.py
rename to praktikum/burger.py
diff --git a/database.py b/praktikum/database.py
similarity index 100%
rename from database.py
rename to praktikum/database.py
diff --git a/ingredient.py b/praktikum/ingredient.py
similarity index 100%
rename from ingredient.py
rename to praktikum/ingredient.py
diff --git a/ingredient_types.py b/praktikum/ingredient_types.py
similarity index 100%
rename from ingredient_types.py
rename to praktikum/ingredient_types.py
diff --git a/praktikum.py b/praktikum/praktikum.py
similarity index 100%
rename from praktikum.py
rename to praktikum/praktikum.py
diff --git a/pytest.ini b/pytest.ini
new file mode 100644
index 000000000..03f586d41
--- /dev/null
+++ b/pytest.ini
@@ -0,0 +1,2 @@
+[pytest]
+pythonpath = .
\ No newline at end of file
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 000000000..cffeec658
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,2 @@
+pytest
+pytest-cov
\ No newline at end of file
diff --git a/tests/test_bun.py b/tests/test_bun.py
new file mode 100644
index 000000000..1ed4b9a22
--- /dev/null
+++ b/tests/test_bun.py
@@ -0,0 +1,15 @@
+from praktikum.bun import Bun
+import pytest
+
+
+class TestBun:
+    @pytest.mark.parametrize("name, price", [
+        ("black bun", 100),
+        ("white bun", 200),
+        ("red bun", 300)
+    ])
+    def test_bun_initialization(self, name, price):
+        bun = Bun(name, price)
+
+        assert bun.get_name() == name
+        assert bun.get_price() == price
diff --git a/tests/test_burger.py b/tests/test_burger.py
new file mode 100644
index 000000000..8391b858f
--- /dev/null
+++ b/tests/test_burger.py
@@ -0,0 +1,101 @@
+from praktikum.burger import Burger
+from unittest.mock import Mock
+
+
+class TestBurger:
+    def test_set_buns(self):
+        burger = Burger()
+        mock_bun = Mock()
+        mock_bun.get_price.return_value = 100
+        mock_bun.get_name.return_value = "black bun"
+
+        burger.set_buns(mock_bun)
+        assert burger.bun == mock_bun
+
+    def test_add_ingredient(self):
+        burger = Burger()
+        mock_ingredient = Mock()
+        mock_ingredient.get_price.return_value = 50
+        mock_ingredient.get_name.return_value = "sausage"
+        mock_ingredient.get_type.return_value = "FILLING"
+
+        burger.add_ingredient(mock_ingredient)
+        assert burger.ingredients[0] == mock_ingredient
+
+    def test_remove_ingredient(self):
+        burger = Burger()
+        mock_ingredient = Mock()
+        mock_ingredient.get_price.return_value = 50
+        mock_ingredient.get_name.return_value = "sausage"
+        mock_ingredient.get_type.return_value = "FILLING"
+
+        burger.add_ingredient(mock_ingredient)
+        burger.remove_ingredient(0)
+
+        assert len(burger.ingredients) == 0
+
+    def test_move_ingredient(self):
+        burger = Burger()
+        mock_ingredient1 = Mock()
+        mock_ingredient1.get_price.return_value = 50
+        mock_ingredient1.get_name.return_value = "sausage"
+        mock_ingredient1.get_type.return_value = "FILLING"
+
+        mock_ingredient2 = Mock()
+        mock_ingredient2.get_price.return_value = 30
+        mock_ingredient2.get_name.return_value = "ketchup"
+        mock_ingredient2.get_type.return_value = "SAUCE"
+
+        burger.add_ingredient(mock_ingredient1)
+        burger.add_ingredient(mock_ingredient2)
+
+        burger.move_ingredient(0, 1)
+
+        assert burger.ingredients[0] == mock_ingredient2
+        assert burger.ingredients[1] == mock_ingredient1
+
+    def test_get_price(self):
+        burger = Burger()
+        mock_bun = Mock()
+        mock_bun.get_price.return_value = 100
+        mock_bun.get_name.return_value = "black bun"
+
+        mock_ingredient1 = Mock()
+        mock_ingredient1.get_price.return_value = 50
+        mock_ingredient1.get_name.return_value = "sausage"
+        mock_ingredient1.get_type.return_value = "FILLING"
+
+        mock_ingredient2 = Mock()
+        mock_ingredient2.get_price.return_value = 30
+        mock_ingredient2.get_name.return_value = "ketchup"
+        mock_ingredient2.get_type.return_value = "SAUCE"
+
+        burger.set_buns(mock_bun)
+        burger.add_ingredient(mock_ingredient1)
+        burger.add_ingredient(mock_ingredient2)
+
+        assert burger.get_price() == 280
+
+    def test_get_receipt(self):
+        burger = Burger()
+        mock_bun = Mock()
+        mock_bun.get_price.return_value = 100
+        mock_bun.get_name.return_value = "black bun"
+
+        mock_ingredient1 = Mock()
+        mock_ingredient1.get_price.return_value = 50
+        mock_ingredient1.get_name.return_value = "sausage"
+        mock_ingredient1.get_type.return_value = "FILLING"
+
+        mock_ingredient2 = Mock()
+        mock_ingredient2.get_price.return_value = 30
+        mock_ingredient2.get_name.return_value = "ketchup"
+        mock_ingredient2.get_type.return_value = "SAUCE"
+
+        burger.set_buns(mock_bun)
+        burger.add_ingredient(mock_ingredient1)
+        burger.add_ingredient(mock_ingredient2)
+
+        expected_receipt = '(==== black bun ====)\n= filling sausage =\n= sauce ketchup =\n(==== black bun ====)\n\nPrice: 280'
+
+        assert burger.get_receipt() == expected_receipt                    
\ No newline at end of file
diff --git a/tests/test_database.py b/tests/test_database.py
new file mode 100644
index 000000000..03d736e69
--- /dev/null
+++ b/tests/test_database.py
@@ -0,0 +1,26 @@
+from praktikum.database import Database
+from praktikum.ingredient_types import INGREDIENT_TYPE_SAUCE
+
+
+class TestDatabase:
+    def test_database_has_buns(self):
+        database = Database()
+
+        assert len(database.available_buns()) > 0
+
+    def test_available_buns(self):
+        database = Database()
+
+        buns = database.available_buns()
+
+        assert buns[0].name == "black bun"
+        assert buns[0].price == 100
+
+    def test_available_ingredients(self):
+        database = Database()
+
+        ingredients = database.available_ingredients()
+
+        assert ingredients[0].name == "hot sauce"
+        assert ingredients[0].price == 100
+        assert ingredients[0].type == INGREDIENT_TYPE_SAUCE
\ No newline at end of file
diff --git a/tests/test_ingredient.py b/tests/test_ingredient.py
new file mode 100644
index 000000000..f09562292
--- /dev/null
+++ b/tests/test_ingredient.py
@@ -0,0 +1,31 @@
+import pytest
+from praktikum.ingredient import Ingredient
+from praktikum.ingredient_types import INGREDIENT_TYPE_SAUCE, INGREDIENT_TYPE_FILLING
+
+
+class TestIngredient:
+    @pytest.mark.parametrize("ingredient_type, name, price", [
+        (INGREDIENT_TYPE_SAUCE, "hot sauce", 100),
+        (INGREDIENT_TYPE_FILLING, "sausage", 300),
+    ])
+    def test_ingredient_initialization(self, ingredient_type, name, price):
+        ingredient = Ingredient(ingredient_type, name, price)
+
+        assert ingredient.type == ingredient_type
+        assert ingredient.name == name
+        assert ingredient.price == price
+
+    def test_get_name(self):
+        ingredient = Ingredient(INGREDIENT_TYPE_FILLING, "sausage", 50)
+
+        assert ingredient.get_name() == "sausage"
+
+    def test_get_price(self):
+        ingredient = Ingredient(INGREDIENT_TYPE_FILLING, "sausage", 50)
+
+        assert ingredient.get_price() == 50
+
+    def test_get_type(self):
+        ingredient = Ingredient(INGREDIENT_TYPE_SAUCE, "hot sauce", 50)
+
+        assert ingredient.get_type() == INGREDIENT_TYPE_SAUCE
\ No newline at end of file