test: add comprehensive Jest tests for getCardValue function

Author: Tarawally

Sprint-3/1-implement-and-rewrite-tests/rewrite-tests-with-jest/3-get-card-value.test.js

@@ -7,7 +7,34 @@ test("should return 11 for Ace of Spades", () => {
   expect(aceofSpades).toEqual(11);
 });
 
-// Case 2: Handle Number Cards (2-10):
-// Case 3: Handle Face Cards (J, Q, K):
-// Case 4: Handle Ace (A):
-// Case 5: Handle Invalid Cards:
+test("should return correct value for number cards (2-9)", () => {
+  expect(getCardValue("2♦")).toEqual(2);
+  expect(getCardValue("3♣")).toEqual(3);
+  expect(getCardValue("4♥")).toEqual(4);
+  expect(getCardValue("5♥")).toEqual(5);
+  expect(getCardValue("6♠")).toEqual(6);
+  expect(getCardValue("7♦")).toEqual(7);
+  expect(getCardValue("8♣")).toEqual(8);
+  expect(getCardValue("9♥")).toEqual(9);
+});
+
+test("should return 10 for face cards (J, Q, K, 10)", () => {
+  expect(getCardValue("10♣")).toEqual(10);
+  expect(getCardValue("J♦")).toEqual(10);
+  expect(getCardValue("Q♠")).toEqual(10);
+  expect(getCardValue("K♥")).toEqual(10);
+});
+
+test("should return 11 for all Aces", () => {
+  expect(getCardValue("A♠")).toEqual(11);
+  expect(getCardValue("A♥")).toEqual(11);
+  expect(getCardValue("A♦")).toEqual(11);
+  expect(getCardValue("A♣")).toEqual(11);
+});
+
+test("should throw an error for invalid card rank", () => {
+  expect(() => getCardValue("X♠")).toThrow("Invalid card rank");
+  expect(() => getCardValue("Z♥")).toThrow("Invalid card rank");
+  expect(() => getCardValue("11♦")).toThrow("Invalid card rank");
+  expect(() => getCardValue("0♣")).toThrow("Invalid card rank");
+});