blackjack/tests/test_deck.py

import pytest
from pyjack.deck import Deck


@pytest.fixture
def default_deck() -> Deck:
    deck = Deck()
    return deck


def test_deck_init(default_deck):
    """Tests if the right amount of cards is created"""
    assert len(default_deck.cards) == 52


def test_deck_shuffle_order_changes(default_deck):
    """Tests if the order of the cards have been changed."""
    # saves a list of cards before shufflening
    ordered_cards = list(default_deck.cards)
    #shuffle cards
    default_deck.shuffle()

    assert default_deck.cards != ordered_cards

def test_deck_shuffle_content_is_preserved(default_deck):
    # 1. Capture the unique cards of the original list (as a set)
    original_card_set = set(str(card) for card in default_deck.cards)
    # 2. Shuffle the deck
    default_deck.shuffle()
    # 3. Check if the number of cards is still 52
    assert len(default_deck.cards) == 52
    # 4. Check if the card contents are still identical (all 52 unique cards must be present)
    shuffled_card_set = set(str(card) for card in default_deck.cards)
    assert shuffled_card_set == original_card_set
  
def test_card_dealing(default_deck):
    """Tests if the a card is correctly removed from the deck."""
    default_deck.shuffle()
    removed_card = default_deck.deal_card()
    assert len(default_deck.cards) == 51
    assert removed_card is not None