Rewrite tests for getCardValue using Jest

Author: cywong-dev

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

@@ -9,11 +9,31 @@ test(`Should return 11 when given an ace card`, () => {
   expect(getCardValue("A♠")).toEqual(11);
 });
 
-// Suggestion: Group the remaining test data into these categories:
-//   Number Cards (2-10)
-//   Face Cards (J, Q, K)
-//   Invalid Cards
+// Number cards (2–10)
+test('returns correct numeric values for number cards', () => {
+    expect(getCardValue("2♠")).toEqual(2);
+    expect(getCardValue("5♥")).toEqual(5);
+    expect(getCardValue("9♦")).toEqual(9);
+    expect(getCardValue("10♣")).toEqual(10);
+});
+
+// Face cards
+test('returns 10 for face cards', () => {
+    expect(getCardValue("J♠")).toEqual(10);
+    expect(getCardValue("Q♥")).toEqual(10);
+    expect(getCardValue("K♦")).toEqual(10);
+});
 
+// Ace
+test('returns 11 for Ace', () => {
+    expect(getCardValue("A♣")).toEqual(11);
+});
+
+// Invalid cards
+test('invalid card strings should throw an error', () => {
+    expect(() => getCardValue("A")).toThrow();
+    expect(() => getCardValue("B")).toThrow();
+});
 // To learn how to test whether a function throws an error as expected in Jest,
 // please refer to the Jest documentation:
 // https://jestjs.io/docs/expect#tothrowerror