Throw an error for "Invalid card rank." and update the test to expect an error to be thrown

Author: anosidium

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

@@ -17,7 +17,7 @@ function getCardValue(card) {
   } else if (rank >= 2 && rank <= 10) {
     return Number(rank);
   } else {
-    return "Invalid card rank.";
+    return new Error("Invalid card rank.");
   }
 }
 

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

@@ -33,6 +33,5 @@ test("should return 11 for an Ace", () => {
 
 // Case 5: Handle Invalid Cards:
 test("should return `Invalid card rank.` for an invalid card", () => {
-  const invalidRank = getCardValue("@");
-  expect(invalidRank).toEqual("Invalid card rank.");
+  expect(() => getCardValue("@").toThrow("Invalid card rank."));
 });