diff --git a/conftest.py b/conftest.py
new file mode 100644
index 000000000..21c54d6a0
--- /dev/null
+++ b/conftest.py
@@ -0,0 +1,27 @@
+import pytest
+from praktikum.burger import Burger
+from praktikum.database import Database
+from helpers import create_mock_ingredient
+from data import *
+
+@pytest.fixture
+def burger():
+    return Burger()
+
+@pytest.fixture
+def database():
+    return Database()
+
+@pytest.fixture
+def full_burger():
+    """Полностью собранный бургер."""
+    burger = Burger()
+    bun = create_mock_ingredient("bun", TEST_BUN["name"], TEST_BUN["price"])
+    sauce = create_mock_ingredient(**TEST_SAUCE)
+    filling = create_mock_ingredient(**TEST_FILLING_1)
+
+    burger.set_buns(bun)
+    burger.add_ingredient(sauce)
+    burger.add_ingredient(filling)
+    return burger
+
diff --git a/data.py b/data.py
new file mode 100644
index 000000000..aeb0273ac
--- /dev/null
+++ b/data.py
@@ -0,0 +1,81 @@
+from praktikum.ingredient_types import INGREDIENT_TYPE_SAUCE, INGREDIENT_TYPE_FILLING
+from praktikum.bun import Bun
+from praktikum.ingredient import Ingredient
+
+TEST_BUN_DATA = {
+    "names": [
+        ("black bun", "black bun"),
+        ("булочка", "булочка"),
+        ("a", "a"),
+    ],
+    "prices": [
+        (300.0, 300.0),
+        (350.50, 350.50),
+        (2, 2),
+    ]
+}
+
+TEST_INGREDIENT_DATA = {
+    "types": [
+        (INGREDIENT_TYPE_SAUCE, INGREDIENT_TYPE_SAUCE),
+        (INGREDIENT_TYPE_FILLING, INGREDIENT_TYPE_FILLING),
+    ],
+    "names": [
+        ("соус", "соус"),
+        ("ingredient", "ingredient"),
+    ],
+    "prices": [
+        (100.0, 100.0),
+        (0, 0),
+        (350.50, 350.50),
+    ]
+}
+
+TEST_BUN = {
+    "name": "Булочка с кунжутом",
+    "price": 50.0
+}
+TEST_BUN_2 = {
+    "name": "Космическая булочка",
+    "price": 150.0
+}
+
+TEST_SAUCE =  {
+        "type": INGREDIENT_TYPE_SAUCE,
+        "name": "Кетчуп",
+        "price": 20.0
+    }
+TEST_FILLING_1 =  {
+        "type": INGREDIENT_TYPE_FILLING,
+        "name": "Котлета гриль",
+        "price": 150.0
+    }
+
+TEST_FILLING_2 =  {
+        "type": INGREDIENT_TYPE_FILLING,
+        "name": "Сыр",
+        "price": 80.0
+    }
+
+RECEIPT_TEMPLATE = (
+    "(==== {bun} ====)\n"
+    "= sauce {sauce} =\n"
+    "= filling {filling} =\n"
+    "(==== {bun} ====)\n"
+    "\n"
+    "Price: {price}"
+)
+EXPECTED_BUNS = [
+    Bun("black bun", 100),
+    Bun("white bun", 200),
+    Bun("red bun", 300)
+]
+
+EXPECTED_INGREDIENTS = [
+    Ingredient(INGREDIENT_TYPE_SAUCE, "hot sauce", 100),
+    Ingredient(INGREDIENT_TYPE_SAUCE, "sour cream", 200),
+    Ingredient(INGREDIENT_TYPE_SAUCE, "chili sauce", 300),
+    Ingredient(INGREDIENT_TYPE_FILLING, "cutlet", 100),
+    Ingredient(INGREDIENT_TYPE_FILLING, "dinosaur", 200),
+    Ingredient(INGREDIENT_TYPE_FILLING, "sausage", 300)
+]
\ No newline at end of file
diff --git a/helpers.py b/helpers.py
new file mode 100644
index 000000000..5eca79109
--- /dev/null
+++ b/helpers.py
@@ -0,0 +1,9 @@
+from unittest.mock import Mock
+
+def create_mock_ingredient(type, name, price):
+    """Вспомогательная функция для создания мок-ингредиента."""
+    mock = Mock()
+    mock.get_type.return_value = type
+    mock.get_name.return_value = name
+    mock.get_price.return_value = price
+    return mock
\ No newline at end of file
diff --git a/__init__.py b/praktikum/__init__.py
similarity index 100%
rename from __init__.py
rename to praktikum/__init__.py
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/requirements.txt b/requirements.txt
new file mode 100644
index 000000000..c3362913e
Binary files /dev/null and b/requirements.txt differ
diff --git a/tests/test_bun.py b/tests/test_bun.py
new file mode 100644
index 000000000..92b24df9b
--- /dev/null
+++ b/tests/test_bun.py
@@ -0,0 +1,17 @@
+import pytest
+from praktikum.bun import Bun
+from data import TEST_BUN_DATA
+
+class TestBun:
+
+    @pytest.mark.parametrize("name, expected_name", TEST_BUN_DATA["names"])
+    def test_get_name_returns_correct_name(self, name, expected_name):
+        """Метод get_name возвращает правильное имя."""
+        bun = Bun(name, 100.0)
+        assert bun.get_name() == expected_name
+
+    @pytest.mark.parametrize("price, expected_price", TEST_BUN_DATA["prices"])
+    def test_get_price_returns_correct_price(self, price, expected_price):
+        """Метод get_price возвращает правильную цену."""
+        bun = Bun("Булочка", price)
+        assert bun.get_price() == expected_price
\ No newline at end of file
diff --git a/tests/test_burger.py b/tests/test_burger.py
new file mode 100644
index 000000000..cd7b25a1c
--- /dev/null
+++ b/tests/test_burger.py
@@ -0,0 +1,70 @@
+from data import *
+
+class TestBurger:
+
+    def test_burger_initially_empty(self, burger):
+        """Бургер создаётся без булочки и ингредиентов."""
+        assert burger.bun is None and burger.ingredients == []
+
+    def test_set_buns_stores_bun(self, burger):
+        """Бургер сохраняет переданную булочку."""
+        bun = Bun(*TEST_BUN)
+        burger.set_buns(bun)
+        assert burger.bun == bun
+
+    def test_set_buns_overwrites_previous_bun(self, burger):
+        """Повторный вызов заменяет булочку."""
+        bun1 = Bun(*TEST_BUN)
+        bun2 = Bun(*TEST_BUN_2)
+        burger.set_buns(bun1)
+        burger.set_buns(bun2)
+        assert burger.bun == bun2
+
+    def test_add_ingredient_appends_to_list(self, burger):
+        """Ингредиент добавляется в конец списка."""
+        ingredient1 = Ingredient(*TEST_SAUCE)
+        ingredient2 = Ingredient(*TEST_FILLING_1)
+        burger.add_ingredient(ingredient1)
+        burger.add_ingredient(ingredient2)
+        assert burger.ingredients == [ingredient1, ingredient2]
+
+    def test_can_add_same_ingredient_multiple_times(self, burger):
+        """Можно добавить один и тот же ингридиент несколько раз."""
+        ingredient = Ingredient(*TEST_FILLING_1)
+        burger.add_ingredient(ingredient)
+        burger.add_ingredient(ingredient)
+        assert burger.ingredients == [ingredient, ingredient] and len(burger.ingredients) == 2
+
+    def test_remove_ingredient_by_index(self, burger):
+        """Удаление ингредиента по индексу."""
+        ing1 = Ingredient(*TEST_SAUCE)
+        ing2 = Ingredient(*TEST_FILLING_1)
+        burger.ingredients = [ing1, ing2]
+        burger.remove_ingredient(0)
+        assert burger.ingredients == [ing2]
+
+    def test_move_ingredient_changes_order(self, burger):
+        """Перемещение меняет порядок ингредиентов."""
+        ing1 = Ingredient(*TEST_SAUCE)
+        ing2 = Ingredient(*TEST_FILLING_1)
+        ing3 = Ingredient(*TEST_FILLING_2)
+        burger.ingredients = [ing1, ing2, ing3]
+        burger.move_ingredient(0, 2)
+        assert burger.ingredients == [ing2, ing3, ing1]
+
+    def test_get_price(self, full_burger):
+        """Проверка расчёта цены."""
+        price = full_burger.get_price()
+        assert price == 270.0
+
+    def test_get_receipt_format(self, full_burger):
+        """Проверка формата чека."""
+        receipt = full_burger.get_receipt()
+        expected_price = (TEST_BUN["price"] * 2 + TEST_SAUCE["price"] + TEST_FILLING_1["price"])
+        expected = RECEIPT_TEMPLATE.format(
+            bun=TEST_BUN["name"],
+            sauce=TEST_SAUCE["name"],
+            filling=TEST_FILLING_1["name"],
+            price=expected_price
+        )
+        assert receipt == expected
\ No newline at end of file
diff --git a/tests/test_database.py b/tests/test_database.py
new file mode 100644
index 000000000..f1c800ea4
--- /dev/null
+++ b/tests/test_database.py
@@ -0,0 +1,55 @@
+import pytest
+from data import EXPECTED_BUNS, EXPECTED_INGREDIENTS
+
+class TestDatabase:
+
+    def test_available_buns_returns_list(self, database):
+        """Метод available_buns возвращает список"""
+        result = database.available_buns()
+        assert isinstance(result, list)
+
+    def test_available_buns_not_empty(self, database):
+        """Список булочек не пустой"""
+        result = database.available_buns()
+        assert len(result) > 0
+
+    def test_available_buns_count(self, database):
+        """Количество булочек"""
+        result = database.available_buns()
+        assert len(result) == 3
+
+    def test_available_ingredients_returns_list(self, database):
+        """Метод available_ingredients возвращает список"""
+        result = database.available_ingredients()
+        assert isinstance(result, list)
+
+    def test_available_ingredients_not_empty(self, database):
+        """Список ингредиентов не пустой"""
+        result = database.available_ingredients()
+        assert len(result) > 0
+
+    def test_available_ingredients_count(self, database):
+        """Количество ингредиентов"""
+        result = database.available_ingredients()
+        assert len(result) == 6
+
+    @pytest.mark.parametrize("expected_bun", EXPECTED_BUNS)
+    def test_available_buns_contains_expected(self, database, expected_bun):
+        """Проверяет, что каждая ожидаемая булочка присутствует"""
+        buns = database.available_buns()
+        assert any(
+            bun.get_name() == expected_bun.get_name() and
+            bun.get_price() == expected_bun.get_price()
+            for bun in buns
+        )
+
+    @pytest.mark.parametrize("expected_ingredient", EXPECTED_INGREDIENTS)
+    def test_available_ingredients_contains_expected(self, database, expected_ingredient):
+        """Проверяет, что каждый ожидаемый ингредиент присутствует"""
+        ingredients = database.available_ingredients()
+        assert any(
+            ingredient.get_type() == expected_ingredient.get_type() and
+            ingredient.get_name() == expected_ingredient.get_name() and
+            ingredient.get_price() == expected_ingredient.get_price()
+            for ingredient in ingredients
+        )
\ No newline at end of file
diff --git a/tests/test_ingredient.py b/tests/test_ingredient.py
new file mode 100644
index 000000000..753aa29e1
--- /dev/null
+++ b/tests/test_ingredient.py
@@ -0,0 +1,27 @@
+import pytest
+from praktikum.ingredient import Ingredient
+from praktikum.ingredient_types import INGREDIENT_TYPE_SAUCE
+from data import TEST_INGREDIENT_DATA
+
+class TestIngredient:
+
+    @pytest.mark.parametrize("ingredient_type, expected_type", TEST_INGREDIENT_DATA["types"])
+    def test_get_type_returns_correct_type(self, ingredient_type, expected_type):
+        """Метод get_type возвращает правильный тип."""
+        ingredient = Ingredient(ingredient_type, "Название ингридиента", 100.0)
+        assert ingredient.get_type() == expected_type
+
+    @pytest.mark.parametrize("name, expected_name", TEST_INGREDIENT_DATA["names"])
+    def test_get_name_returns_correct_name(self, name, expected_name):
+        """Метод get_name возвращает правильное имя."""
+        ingredient = Ingredient(INGREDIENT_TYPE_SAUCE, name, 100.0)
+        assert ingredient.get_name() == expected_name
+
+    @pytest.mark.parametrize("price, expected_price", TEST_INGREDIENT_DATA["prices"])
+    def test_get_price_returns_correct_price(self, price, expected_price):
+        """Метод get_price возвращает правильную цену."""
+        ingredient = Ingredient(INGREDIENT_TYPE_SAUCE, "Название ингридиента", price)
+        assert ingredient.get_price() == expected_price
+
+
+