3-get-card-value.test.js

// This statement loads the getCardValue function you wrote in the implement directory.
// We will use the same function, but write tests for it using Jest in this file.
const getCardValue = require("../implement/3-get-card-value");

// TODO: Write tests in Jest syntax to cover all possible outcomes.

// Case 1: Ace (A)
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)
test(`should return the correct value for number cards`, () => {
  expect(getCardValue("2♠")).toEqual(2);
  expect(getCardValue("10♣")).toEqual(10);
  expect(getCardValue("6♥")).toEqual(6);
  expect(getCardValue("9♦")).toEqual(9);
  expect(getCardValue("3♠")).toEqual(3);
});
//   Face Cards (J, Q, K)
test(`should return the correct value for face cards`, () => {
  expect(getCardValue("J♠")).toEqual(10);
  expect(getCardValue("Q♠")).toEqual(10);
  expect(getCardValue("K♠")).toEqual(10);
});
//   Invalid Cards
test("should throw error for invalid cards", () => {
  expect(() => getCardValue("1♠")).toThrow();
  expect(() => getCardValue("11♠")).toThrow();
  expect(() => getCardValue("Z♠")).toThrow();
  expect(() => getCardValue("A")).toThrow();
  expect(() => getCardValue("♠")).toThrow();
  expect(() => getCardValue("")).toThrow();
  expect(() => getCardValue(null)).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