diff --git a/pyproject.toml b/pyproject.toml
index 06fbe913..d74e7484 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,6 +10,10 @@ dependencies = []
 dev = [
     "mypy==2.3.1",
     "ruff==0.16.8",
+    "pytest>=8.0",
+    "pytest-cov>=5.0",
+    "ruff>=0.6",
+    "mypy>=1.11",
 ]
 
 [tool.ruff]
@@ -33,3 +37,21 @@ avoid-escape = true
 [tool.ruff.lint.isort]
 lines-after-imports = 2
 split-on-trailing-comma = true
+
+[tool.pytest.ini_options]
+testpaths = ["test"]
+pythonpath = ["src"]
+norecursedirs = ["25_09", ".venv", "__pycache__"]
+addopts = "-q --strict-markers"
+
+[tool.mypy]
+python_version = "3.12"
+strict = true
+files = ["src"]
+mypy_path = "src"
+warn_unused_ignores = true
+warn_return_any = true
+disallow_untyped_defs = true
+disallow_incomplete_defs = true
+no_implicit_optional = true
+show_error_codes = true
\ No newline at end of file
diff --git a/run_local_checks b/run_local_checks
index 7345200f..78145212 100755
--- a/run_local_checks
+++ b/run_local_checks
@@ -21,4 +21,7 @@ uv run ruff format --check src
 echo "==> MyPy"
 uv run mypy --strict src
 
+echo "==> Pytest"
+uv run pytest -q
+
 echo "All checks passed."
diff --git a/run_local_checks.bat b/run_local_checks.bat
index e1b1ce9e..aed23cd5 100644
--- a/run_local_checks.bat
+++ b/run_local_checks.bat
@@ -20,4 +20,7 @@ uv run ruff format --check src || exit /b 1
 echo ==^> MyPy
 uv run mypy --strict src || exit /b 1
 
+echo ==^> Pytest
+uv run pytest -q tests || exit /b 1
+
 echo All checks passed.
diff --git a/src/part1/constants.py b/src/part1/constants.py
index 9abfbba2..095f20d0 100644
--- a/src/part1/constants.py
+++ b/src/part1/constants.py
@@ -1,38 +1,18 @@
-"""Bit layout and default epoch for the Twitter Snowflake ID generator.
+def my_max_value(n: int) -> int:
+    return int(2**n - 1)
 
-A Snowflake identifier is a 63-bit positive integer packed as follows, from
-the most significant bit downwards:
 
-    1 bit   unused sign bit, always zero
-    41 bits milliseconds elapsed since a custom epoch
-    10 bits node identifier
-    12 bits per-millisecond sequence counter
+EPOCH_MS_DEFAULT = 1288834974657
+NODE_ID_DEFAULT = 1
 
-The shift and mask constants should be derived from the bit widths so that
-changing a width keeps everything else consistent.
-"""
 
-from typing import Final
+TIMESTAMP_BITS = 41  # число миллисекунд прощедщих с момента пользовательской эпохи
+NODE_ID_BITS = 10  # номер узла
+SEQUENCE_ID_BITS = 12  # порядковый номер
 
+TIMESTAMP_SHIFT = NODE_ID_BITS + SEQUENCE_ID_BITS
 
-# TODO: замените заглушки (0) на корректные значения, см. TASK.md.
-# Все константы, зависящие от ёмкостей *_BITS, должны вычисляться из них.
-
-# Twitter's original Snowflake epoch: 2010-11-04 01:42:54.657 UTC.
-EPOCH_MS_DEFAULT: Final[int] = 0
-
-# Node identifier used when the caller does not supply one.
-NODE_ID_DEFAULT: Final[int] = 0
-
-# Width of each field, in bits.
-TIMESTAMP_BITS: Final[int] = 0
-NODE_ID_BITS: Final[int] = 0
-SEQUENCE_ID_BITS: Final[int] = 0
-
-# Largest value each field can hold.
-TIMESTAMP_MS_MAX: Final[int] = 0
-NODE_ID_MAX: Final[int] = 0
-SEQUENCE_ID_MAX: Final[int] = 0
-
-# Здесь можно добавить собственные вспомогательные константы
-# (например, сдвиги полей при сборке идентификатора).
+# так как номер и время(все три строчки) беззнаковые
+TIMESTAMP_MS_MAX = my_max_value(TIMESTAMP_BITS)
+NODE_ID_MAX = my_max_value(NODE_ID_BITS)
+SEQUENCE_ID_MAX = my_max_value(SEQUENCE_ID_BITS)
diff --git a/src/part1/snowflake.py b/src/part1/snowflake.py
index d3abf050..95ca761c 100644
--- a/src/part1/snowflake.py
+++ b/src/part1/snowflake.py
@@ -1,114 +1,46 @@
-"""Twitter Snowflake identifier generator.
+import time
 
-Snowflake produces roughly time-ordered 64-bit integer identifiers without
-coordination between nodes. Each identifier packs the milliseconds elapsed
-since a custom epoch, a node identifier and a per-millisecond sequence counter
-into a single 63-bit positive integer (see ``constants`` for the layout).
-
-The public entry point is :func:`generate_snowflake_id`. It is stateless: the
-caller passes the sequence counter on every call and is responsible for
-advancing it within a millisecond and resetting it when the clock ticks over.
-
-Each packed field can be read back on its own with :func:`decode_timestamp_ms`,
-:func:`decode_node_id` and :func:`decode_sequence_id`.
-"""
-
-import time  # noqa: F401
-
-from .constants import (  # noqa: F401
-    EPOCH_MS_DEFAULT,
-    NODE_ID_DEFAULT,
-    NODE_ID_MAX,
-    SEQUENCE_ID_MAX,
-    TIMESTAMP_MS_MAX,
-)
+from .constants import *
 
 
 def read_current_millis(epoch_ms: int) -> int:
-    """Read the number of milliseconds elapsed since the custom epoch.
-
-    Args:
-        epoch_ms: The custom epoch expressed as Unix milliseconds.
-
-    Returns:
-        The count of whole milliseconds between ``epoch_ms`` and now. May be
-        negative if ``epoch_ms`` lies in the future.
-    """
-    # TODO: реализуйте функцию
-    return 0
+    now_ms = time.time_ns() // 1_000_000  # текущий моент
+    return now_ms - epoch_ms
 
 
 def decode_timestamp_ms(snowflake_id: int, epoch_ms: int = EPOCH_MS_DEFAULT) -> int:
-    """Read the timestamp field out of a Snowflake identifier.
-
-    Args:
-        snowflake_id: An identifier produced against the same epoch.
-        epoch_ms: The epoch the identifier was generated against. Defaults to
-            the original Twitter epoch (2010-11-04 01:42:54.657 UTC).
-
-    Returns:
-        The absolute Unix time in milliseconds at which the identifier was
-        generated.
-    """
-    # TODO: реализуйте функцию
-    return 0
+    return (snowflake_id >> TIMESTAMP_SHIFT) + epoch_ms
 
 
 def decode_node_id(snowflake_id: int) -> int:
-    """Read the node identifier field out of a Snowflake identifier.
-
-    Args:
-        snowflake_id: An identifier produced by :func:`generate_snowflake_id`.
-
-    Returns:
-        The node identifier packed into ``snowflake_id``, in the range
-        ``[0, NODE_ID_MAX]``.
-    """
-    # TODO: реализуйте функцию
-    return 0
+    return (snowflake_id >> SEQUENCE_ID_BITS) & NODE_ID_MAX
 
 
 def decode_sequence_id(snowflake_id: int) -> int:
-    """Read the sequence counter field out of a Snowflake identifier.
+    return snowflake_id & SEQUENCE_ID_MAX
 
-    Args:
-        snowflake_id: An identifier produced by :func:`generate_snowflake_id`.
-
-    Returns:
-        The per-millisecond sequence counter packed into ``snowflake_id``, in
-        the range ``[0, SEQUENCE_ID_MAX]``.
-    """
-    # TODO: реализуйте функцию
-    return 0
+    # главная функция
 
 
 def generate_snowflake_id(
-    sequence_id: int,
-    node_id: int = NODE_ID_DEFAULT,
-    epoch_ms: int = EPOCH_MS_DEFAULT,
+    sequence_id: int, node_id: int = NODE_ID_DEFAULT, epoch_ms: int = EPOCH_MS_DEFAULT
 ) -> int | None:
-    """Build and return a Snowflake identifier for the current millisecond.
-
-    The function is stateless: the caller passes the per-millisecond sequence
-    counter explicitly. It is the caller's responsibility to increment
-    ``sequence_id`` for identifiers minted within the same millisecond and to
-    reset it once the clock advances.
-
-    Args:
-        sequence_id: The per-millisecond sequence counter, in the range
-            ``[0, SEQUENCE_ID_MAX]``.
-        node_id: The identifier of this node, in the range ``[0, NODE_ID_MAX]``.
-            Optional; defaults to ``NODE_ID_DEFAULT``.
-        epoch_ms: The start of the epoch as Unix milliseconds. Optional;
-            defaults to the original Twitter epoch (2010-11-04 01:42:54.657
-            UTC).
 
-    Returns:
-        The Snowflake identifier as a positive 63-bit integer, or ``None`` if
-        ``node_id`` is outside ``[0, NODE_ID_MAX]``, ``sequence_id`` is outside
-        ``[0, SEQUENCE_ID_MAX]``, or the elapsed time no longer fits in the
-        timestamp field (roughly 69 years after ``epoch_ms``). In each of those
-        cases an explanatory message is printed to stdout first.
-    """
-    # TODO: реализуйте функцию
-    return 0
+    local_const_time = read_current_millis(epoch_ms)
+
+    if node_id < 0 or node_id > NODE_ID_MAX:
+        print(f"node_id must be in [0, {NODE_ID_MAX}]")
+        return None
+    if sequence_id < 0 or sequence_id > SEQUENCE_ID_MAX:
+        print(f"sequence_id must be in [0, {SEQUENCE_ID_MAX}]")
+        return None
+    if local_const_time > TIMESTAMP_MS_MAX:
+        print("overflows time")
+        return None
+
+    snowflake_id = (
+        (local_const_time << TIMESTAMP_SHIFT)
+        | (node_id << SEQUENCE_ID_BITS)
+        | sequence_id
+    )
+    return snowflake_id
diff --git a/src/part2/cart.py b/src/part2/cart.py
index 063f9aea..c5ada7da 100644
--- a/src/part2/cart.py
+++ b/src/part2/cart.py
@@ -1,20 +1,10 @@
-"""Shopping-cart operations layered on top of the product store.
-
-The cart is a plain list of tuples, one :data:`CartLine` --
-``(product_id, quantity)`` -- per distinct product. Moving units between the
-store and the cart keeps the two sides in balance: :func:`add_to_cart` takes
-units out of stock, :func:`remove_from_cart` puts them back.
-
-Like the CRUD layer, the failure path never raises -- the operation prints
-an explanatory message to stdout and returns ``None``.
-"""
-
 from typing import Final
 
-from .crud import read_product, update_product  # noqa: F401
-from .storage import (  # noqa: F401
+from .crud import read_product
+from .storage import (
     NAME_INDEX,
     PRICE_INDEX,
+    PRODUCT_ID_INDEX,
     QUANTITY_INDEX,
     Product,
 )
@@ -22,9 +12,15 @@
 
 type CartLine = tuple[int, int]
 
-# TODO: задайте позиции полей внутри кортежа CartLine
 LINE_PRODUCT_ID_INDEX: Final = 0
-LINE_QUANTITY_INDEX: Final = 0
+LINE_QUANTITY_INDEX: Final = 1
+
+
+def find_cart_line(cart: list[CartLine], product_id: int) -> CartLine | None:
+    for line in cart:
+        if line[LINE_PRODUCT_ID_INDEX] == product_id:
+            return line
+    return None
 
 
 def add_to_cart(
@@ -33,28 +29,39 @@ def add_to_cart(
     product_id: int,
     quantity: int,
 ) -> CartLine | None:
-    """Move ``quantity`` units of ``product_id`` from the store into ``cart``.
-
-    The product is looked up in ``storage``. If it is missing, a message is
-    printed (by :func:`~src.part2.crud.read_product`) and nothing
-    changes. If the store holds fewer units than requested, an explanatory
-    message is printed and nothing changes. Otherwise the store record is
-    decremented by ``quantity`` and the cart line for ``product_id`` gains
-    ``quantity`` units -- a new line is created when the cart had none.
-
-    Args:
-        storage: The product store to draw stock from; modified in place on
-            success.
-        cart: The cart to add the units to; modified in place on success.
-        product_id: The identifier of the product to add.
-        quantity: Number of units to move into the cart.
-
-    Returns:
-        The cart line for ``product_id`` after the addition, or ``None``
-        when the product is unknown or the store cannot cover the request.
-    """
-    # TODO: реализуйте функцию
-    return (0, 0)
+    product = read_product(storage, product_id)
+    if product is None:
+        return None
+
+    if quantity <= 0:
+        print(f"quantity must be positive, got {quantity}")
+        return None
+
+    if product[QUANTITY_INDEX] < quantity:
+        print(
+            f"not enough stock for product {product_id}: "
+            f"{product[QUANTITY_INDEX]} available, {quantity} requested"
+        )
+        return None
+
+    for i in range(len(storage)):
+        if storage[i][PRODUCT_ID_INDEX] == product_id:
+            storage[i] = (
+                storage[i][PRODUCT_ID_INDEX],
+                storage[i][NAME_INDEX],
+                storage[i][PRICE_INDEX],
+                storage[i][QUANTITY_INDEX] - quantity,
+            )
+            break
+
+    line = find_cart_line(cart, product_id)
+    if line is None:
+        cart.append((product_id, quantity))
+        return cart[-1]
+
+    idx = cart.index(line)
+    cart[idx] = (product_id, line[LINE_QUANTITY_INDEX] + quantity)
+    return cart[idx]
 
 
 def remove_from_cart(
@@ -63,27 +70,41 @@ def remove_from_cart(
     product_id: int,
     quantity: int,
 ) -> CartLine | None:
-    """Move ``quantity`` units of ``product_id`` from ``cart`` back to the store.
-
-    The cart line for ``product_id`` is looked up. If there is none, a
-    message is printed and nothing changes. If the line holds fewer units
-    than requested, an explanatory message is printed and nothing changes.
-    Otherwise the cart line loses ``quantity`` units -- the line is dropped
-    when it reaches zero -- and the store record gains ``quantity`` units
-    back.
-
-    Args:
-        storage: The product store to return stock to; modified in place on
-            success.
-        cart: The cart to take the units from; modified in place on
-            success.
-        product_id: The identifier of the product to remove.
-        quantity: Number of units to move back into the store.
-
-    Returns:
-        The cart line for ``product_id`` after the removal (a quantity of
-        zero means the line was dropped), or ``None`` when the cart has no
-        line for the product or holds too few units.
-    """
-    # TODO: реализуйте функцию
-    return (0, 0)
+
+    if quantity <= 0:
+        print(f"quantity must be positive, got {quantity}")
+        return None
+
+    line = find_cart_line(cart, product_id)
+    if line is None:
+        print(f"product {product_id} is not in the cart")
+        return None
+
+    if line[LINE_QUANTITY_INDEX] < quantity:
+        print(
+            f"cart holds only {line[LINE_QUANTITY_INDEX]} unit(s) of "
+            f"product {product_id}, cannot remove {quantity}"
+        )
+        return None
+
+    product = read_product(storage, product_id)
+    if product is None:
+        return None
+
+    for i in range(len(storage)):
+        if storage[i][PRODUCT_ID_INDEX] == product_id:
+            storage[i] = (
+                storage[i][PRODUCT_ID_INDEX],
+                storage[i][NAME_INDEX],
+                storage[i][PRICE_INDEX],
+                storage[i][QUANTITY_INDEX] + quantity,
+            )
+            break
+
+    new_quantity = line[LINE_QUANTITY_INDEX] - quantity
+    idx = cart.index(line)
+    if new_quantity == 0:
+        del cart[idx]
+        return (product_id, 0)
+    cart[idx] = (product_id, new_quantity)
+    return cart[idx]
diff --git a/src/part2/crud.py b/src/part2/crud.py
index d026cbcb..9edec7f8 100644
--- a/src/part2/crud.py
+++ b/src/part2/crud.py
@@ -1,79 +1,48 @@
-"""Create/read/update/delete operations over the in-memory product store.
-
-Every operation takes the store -- a list of
-:data:`~src.part2.storage.Product` tuples -- as its first argument and
-works on it in place. The failure path never raises: the operation prints
-an explanatory message to stdout and returns ``None``.
-
-The identifier of a new product is derived from the store itself
-(:func:`generate_product_id`): one past the greatest identifier in use, or
-:data:`~src.part2.storage.PRODUCT_ID_MIN` when the store is empty.
-Product names are kept unique -- :func:`create_product` refuses a name that
-is already taken.
-"""
-
 from decimal import Decimal
 
-from .storage import (  # noqa: F401
+from .storage import (
     NAME_INDEX,
     PRODUCT_ID_INDEX,
     PRODUCT_ID_MIN,
     Product,
 )
-from .utils import normalize_price  # noqa: F401
+from .utils import normalize_price
 
 
 def generate_product_id(storage: list[Product]) -> int:
-    """Choose the identifier for the next product added to ``storage``.
+    if not storage:
+        return PRODUCT_ID_MIN
+    return max(product[PRODUCT_ID_INDEX] for product in storage) + 1
 
-    Args:
-        storage: The product store to inspect.
 
-    Returns:
-        One past the greatest identifier currently held in ``storage``, or
-        :data:`~src.part2.storage.PRODUCT_ID_MIN` when ``storage`` is
-        empty.
-    """
-    # TODO: реализуйте функцию
-    return 0
+def _find_index(storage: list[Product], product_id: int) -> int | None:
+    for i, product in enumerate(storage):
+        if product[PRODUCT_ID_INDEX] == product_id:
+            return i
+    return None
 
 
 def create_product(
     storage: list[Product], fields: tuple[str, Decimal, int]
 ) -> int | None:
-    """Append a new product to ``storage`` and return its new identifier.
 
-    Args:
-        storage: The product store to append to; modified in place on
-            success.
-        fields: A ``(name, price, quantity)`` tuple describing the product.
-            ``price`` is a :class:`~decimal.Decimal` amount and is rounded
-            to the stored money precision before it is saved.
+    name, price, quantity = fields
+    if any(product[NAME_INDEX] == name for product in storage):
+        print(f"product name '{name}' is already taken")
+        return None
 
-    Returns:
-        The identifier generated for the new product, or ``None`` when a
-        product with the same name already exists. In the ``None`` case
-        ``storage`` is left unchanged and a message naming the clashing
-        name is printed.
-    """
-    # TODO: реализуйте функцию
-    return 0
+    new_id = generate_product_id(storage)
+    storage.append((new_id, name, normalize_price(price), quantity))
+    return new_id
 
 
 def read_product(storage: list[Product], product_id: int) -> Product | None:
-    """Return the product stored under ``product_id``.
-
-    Args:
-        storage: The product store to search.
-        product_id: The identifier to look up.
 
-    Returns:
-        The matching ``(product_id, name, price, quantity)`` record, or
-        ``None`` when no product carries that identifier (a message is
-        printed in that case).
-    """
-    # TODO: реализуйте функцию
-    return (0, "", Decimal(0), 0)
+    idx = _find_index(storage, product_id)
+    if idx is None:
+        print(f"no product with id {product_id}")
+        return None
+    return storage[idx]
 
 
 def update_product(
@@ -81,40 +50,23 @@ def update_product(
     product_id: int,
     fields: tuple[str, Decimal, int],
 ) -> Product | None:
-    """Overwrite the fields of the product stored under ``product_id``.
 
-    The identifier itself is preserved; only ``name``, ``price`` and
-    ``quantity`` are replaced.
+    idx = _find_index(storage, product_id)
+    if idx is None:
+        print(f"no product with id {product_id}")
+        return None
 
-    Args:
-        storage: The product store to modify; the matching record is
-            replaced in place on success.
-        product_id: The identifier of the product to change.
-        fields: A ``(name, price, quantity)`` tuple with the new values.
-            ``price`` is a :class:`~decimal.Decimal` amount and is rounded
-            to the stored money precision before it is saved.
-
-    Returns:
-        The updated ``(product_id, name, price, quantity)`` record, or
-        ``None`` when no product carries that identifier (``storage`` is
-        left unchanged and a message is printed).
-    """
-    # TODO: реализуйте функцию
-    return (0, "", Decimal(0), 0)
+    name, price, quantity = fields
+    storage[idx] = (product_id, name, normalize_price(price), quantity)
+    return storage[idx]
 
 
 def delete_product(storage: list[Product], product_id: int) -> int | None:
-    """Remove the product stored under ``product_id`` from ``storage``.
-
-    Args:
-        storage: The product store to remove from; modified in place on
-            success.
-        product_id: The identifier of the product to remove.
-
-    Returns:
-        ``product_id`` when a product was removed, or ``None`` when no
-        product carried that identifier (``storage`` is left unchanged and
-        a message is printed).
-    """
-    # TODO: реализуйте функцию
-    return 0
+
+    idx = _find_index(storage, product_id)
+    if idx is None:
+        print(f"no product with id {product_id}")
+        return None
+
+    del storage[idx]
+    return product_id
diff --git a/src/part2/storage.py b/src/part2/storage.py
index b63d5fc7..03128124 100644
--- a/src/part2/storage.py
+++ b/src/part2/storage.py
@@ -1,34 +1,14 @@
-"""In-memory product store for the shop CRUD exercise.
-
-The store is deliberately primitive: a plain list of tuples, with no
-persistence, no indexing and no schema enforcement. Each element is a
-:data:`Product` record -- a ``(product_id, name, price, quantity)`` tuple
-where:
-
-* ``product_id`` -- unique positive integer key, assigned by the create
-  operation in :mod:`src.part2.crud`;
-* ``name`` -- human-readable product name, unique across the store;
-* ``price`` -- price of a single unit, held as a :class:`~decimal.Decimal`
-  amount rounded to a fixed number of decimal places (see
-  :func:`src.part2.utils.normalize_price`) so that money is never
-  subject to binary floating-point error;
-* ``quantity`` -- number of units currently in stock.
-
-Field positions are exposed as ``*_INDEX`` constants so callers never
-hard-code tuple offsets.
-"""
-
 from decimal import Decimal
 from typing import Final
 
 
 type Product = tuple[int, str, Decimal, int]
 
-# TODO: задайте позиции полей внутри кортежа Product
+
 PRODUCT_ID_INDEX: Final = 0
-NAME_INDEX: Final = 0
-PRICE_INDEX: Final = 0
-QUANTITY_INDEX: Final = 0
+NAME_INDEX: Final = 1
+PRICE_INDEX: Final = 2
+QUANTITY_INDEX: Final = 3
+
 
-# TODO: задайте идентификатор первого товара в пустом хранилище
-PRODUCT_ID_MIN: Final[int] = 0
+PRODUCT_ID_MIN: Final[int] = 1
diff --git a/src/part2/utils.py b/src/part2/utils.py
index ec0348d3..b9adfaaf 100644
--- a/src/part2/utils.py
+++ b/src/part2/utils.py
@@ -1,29 +1,11 @@
-"""Standalone helpers shared by the hw4 storage and CRUD modules.
-
-For now this is limited to money handling: :func:`normalize_price` rounds a
-raw :class:`~decimal.Decimal` amount to the fixed number of fractional
-digits (:data:`PRICE_PRECISION`) that every stored price uses, keeping
-currency values free of binary floating-point error.
-"""
-
-from decimal import ROUND_HALF_UP, Decimal  # noqa: F401
+from decimal import ROUND_HALF_UP, Decimal
 from typing import Final
 
 
-# TODO: задайте число знаков после запятой и шаг квантования
-PRICE_PRECISION: Final[int] = 0
-PRICE_STEP: Final = Decimal(0)
+PRICE_PRECISION: Final[int] = 2
+PRICE_STEP: Final[Decimal] = Decimal(1).scaleb(-PRICE_PRECISION)
 
 
 def normalize_price(price: Decimal) -> Decimal:
-    """Round a price to the precision every stored record uses.
-
-    Args:
-        price: The raw price amount.
 
-    Returns:
-        ``price`` quantised to :data:`PRICE_PRECISION` fractional digits,
-        with halves rounded up.
-    """
-    # TODO: реализуйте функцию
-    return Decimal(0)
+    return price.quantize(PRICE_STEP, rounding=ROUND_HALF_UP)
diff --git a/test/__init__.py b/test/__init__.py
new file mode 100644
index 00000000..8b137891
--- /dev/null
+++ b/test/__init__.py
@@ -0,0 +1 @@
+
diff --git a/test/test_cart.py b/test/test_cart.py
new file mode 100644
index 00000000..10fe5650
--- /dev/null
+++ b/test/test_cart.py
@@ -0,0 +1,37 @@
+from decimal import Decimal
+
+from src.part2.cart import add_to_cart, remove_from_cart
+from src.part2.crud import create_product, read_product
+
+
+def test_add_remove_returns_to_initial_state() -> None:
+    storage: list = []
+    cart: list = []
+    pid = create_product(storage, ("a", Decimal("10"), 10))
+
+    add_to_cart(storage, cart, pid, 3)
+    assert read_product(storage, pid)[3] == 7
+    assert cart == [(pid, 3)]
+
+    remove_from_cart(storage, cart, pid, 3)
+    assert read_product(storage, pid)[3] == 10
+    assert cart == []
+
+
+def test_stock_conservation() -> None:
+    storage: list = []
+    cart: list = []
+    pid = create_product(storage, ("a", Decimal("10"), 5))
+    add_to_cart(storage, cart, pid, 2)
+    on_stock = read_product(storage, pid)[3]
+    in_cart = cart[0][1]
+    assert on_stock + in_cart == 5
+
+
+def test_add_beyond_stock_fails_cleanly() -> None:
+    storage: list = []
+    cart: list = []
+    pid = create_product(storage, ("a", Decimal("10"), 3))
+    assert add_to_cart(storage, cart, pid, 5) is None
+    assert cart == []
+    assert read_product(storage, pid)[3] == 3
diff --git a/test/test_crud.py b/test/test_crud.py
new file mode 100644
index 00000000..5b623bdb
--- /dev/null
+++ b/test/test_crud.py
@@ -0,0 +1,31 @@
+from decimal import Decimal
+
+from src.part2.crud import create_product, delete_product, read_product, update_product
+
+
+def test_create_read_roundtrip() -> None:
+    storage: list = []
+    pid = create_product(storage, ("яблоко", Decimal("10.005"), 5))
+    assert pid == 1
+    assert read_product(storage, pid) == (1, "яблоко", Decimal("10.01"), 5)
+
+
+def test_delete_then_read_none() -> None:
+    storage: list = []
+    pid = create_product(storage, ("груша", Decimal("20"), 3))
+    assert delete_product(storage, pid) == pid
+    assert read_product(storage, pid) is None
+
+
+def test_unique_name_rejected() -> None:
+    storage: list = []
+    create_product(storage, ("a", Decimal("1"), 1))
+    assert create_product(storage, ("a", Decimal("2"), 2)) is None
+    assert len(storage) == 1
+
+
+def test_update_keeps_id_and_normalizes() -> None:
+    storage: list = []
+    pid = create_product(storage, ("a", Decimal("1"), 1))
+    updated = update_product(storage, pid, ("b", Decimal("2.999"), 7))
+    assert updated == (pid, "b", Decimal("3.00"), 7)
diff --git a/test/test_snowflake.py b/test/test_snowflake.py
new file mode 100644
index 00000000..16deb8f7
--- /dev/null
+++ b/test/test_snowflake.py
@@ -0,0 +1,41 @@
+from part1.constants import EPOCH_MS_DEFAULT, NODE_ID_MAX, SEQUENCE_ID_MAX
+from part1.snowflake import (
+    decode_node_id,
+    decode_sequence_id,
+    decode_timestamp_ms,
+    generate_snowflake_id,
+)
+
+
+def test_roundtrip_node_and_sequence():
+    for node in [0, 1, 42, 500, NODE_ID_MAX]:
+        for seq in [0, 1, 100, 4000, SEQUENCE_ID_MAX]:
+            sid = generate_snowflake_id(seq, node)
+            assert sid is not None
+            assert decode_node_id(sid) == node
+            assert decode_sequence_id(sid) == seq
+
+
+def test_timestamp_close_to_now():
+    import time
+    before = time.time_ns() // 1_000_000
+    sid = generate_snowflake_id(0, 1)
+    after = time.time_ns() // 1_000_000
+
+    ts = decode_timestamp_ms(sid)
+    assert before <= ts <= after
+
+
+def test_positive_64bit():
+    sid = generate_snowflake_id(SEQUENCE_ID_MAX, NODE_ID_MAX)
+    assert 0 < sid < 2**63
+
+
+def test_invalid_node():
+    assert generate_snowflake_id(0, NODE_ID_MAX + 1) is None
+    assert generate_snowflake_id(0, -1) is None
+
+
+def test_invalid_sequence():
+    assert generate_snowflake_id(SEQUENCE_ID_MAX + 1, 1) is None
+    assert generate_snowflake_id(-1, 1) is None
diff --git a/uv.lock b/uv.lock
index 2a56c481..ccc0c939 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1,5 +1,5 @@
 version = 1
-revision = 2
+revision = 5
 requires-python = ">=3.12"
 resolution-markers = [
     "python_full_version >= '3.15'",
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