rewrote test to check an invalid card format

Author: Tobias-Amaechina

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

@@ -62,6 +62,9 @@ test(`Should throw an error when given an invalid card`, () => {
 test(`Should throw an error when given an invalid card`, () => {
   expect(() => getCardValue("A")).toThrow("Invalid card format");
 });
+test(`Should throw an error when given an invalid card`, () => {
+  expect(() => getCardValue("")).toThrow("Invalid card format");
+});
 
 // To learn how to test whether a function throws an error as expected in Jest,
 // please refer to the Jest documentation: