added tests

tests/test_deck.py

@@ -0,0 +1,26 @@
+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_shuffle_deck(default_deck):
+    """Tests if the deck is randomized after method call"""
+    assert default_deck != default_deck.shuffle()
+
+
+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