test: add jest tests for getCardValue

Author: tomdu3

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

@@ -9,6 +9,40 @@ test(`Should return 11 when given an ace card`, () => {
   expect(getCardValue("A♠")).toEqual(11);
 });
 
+
+// Case 2: Jack (J), Queen (Q), and King (K) - Face Cards
+test(`Should return 10 when given a face card`, () => {
+  expect(getCardValue("J♣")).toEqual(10);
+  expect(getCardValue("Q♦")).toEqual(10);
+  expect(getCardValue("K♦")).toEqual(10);
+});
+
+// Case 3: Number Cards (2-10)
+test(`Should return the numeric value when given a number card`, () => {
+  expect(getCardValue("2♥")).toEqual(2);
+  expect(getCardValue("10♥")).toEqual(10);
+  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);
+  expect(getCardValue("10♥")).toEqual(10);
+});
+
+// Case 4: Invalid Cards
+test(`Should throw an error when given an invalid card`, () => {
+  expect(() => getCardValue("KK")).toThrow("Invalid card string");
+  expect(() => getCardValue("A")).toThrow("Invalid card string");
+  expect(() => getCardValue("2")).toThrow("Invalid card string");
+  expect(() => getCardValue("3")).toThrow("Invalid card string");
+  expect(() => getCardValue("44")).toThrow("Invalid card string");
+  expect(() => getCardValue("AA1")).toThrow("Invalid card string");
+  expect(() => getCardValue("♣")).toThrow("Invalid card string");
+  expect(() => getCardValue("")).toThrow("Invalid card string");
+});
+
 // Suggestion: Group the remaining test data into these categories:
 //   Number Cards (2-10)
 //   Face Cards (J, Q, K)