added basic tests

src/ex2_dictionary.py

@@ -0,0 +1,29 @@
+# DO NOT CHANGE THE IMPORTS!
+
+def calculate_price(articles: dict[str, int], cart: dict[str, int]) -> float:
+    price = 0
+    for name, amount in cart.items():
+        if name in articles:
+            price += articles[name] * amount
+    return price / 100
+
+
+def by_amount(articles: dict[str, int], cart: dict[str, int]) -> dict[int, list[str]]:
+    out: dict[int, list[str]] = dict()
+    for name, amount in cart.items():
+        if name not in articles:
+            continue
+        if amount not in out:
+            out[amount] = [name]
+        else:
+            out[amount] += [name]
+    return out
+
+
+if __name__ == "__main__":
+    articles_dict = {"apples": 100, "oranges": 100, "lemons": 200, "avocado": 500}
+    cart_dict = {"apples": 2, "oranges": 2, "lemons": 1, "bananas": 5}
+
+    assert calculate_price(articles_dict, cart_dict) == 6.0
+
+    assert by_amount(articles_dict, cart_dict) == {2: ['apples', 'oranges'], 1: ['lemons']}