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)
//   Face Cards (J, Q, K)
//   Invalid Cards

// Case 2: Face (J, Q, K)
test(`Should return 10 when given an face card`, () => {
  expect(getCardValue("J♣")).toEqual(10);
});

test(`Should return 10 when given an face card`, () => {
  expect(getCardValue("Q♦")).toEqual(10);
});

test(`Should return 10 when given an face card`, () => {
  expect(getCardValue("K♥")).toEqual(10);
});
// Case 3: Number Cards (2-10)
test(`Should return numerical value when given an number card`, () => {
  expect(() => getCardValue("5")).toThrow("Error invalid card");
});

test(`Should return error if the card string is invalid`, () => {
  expect(() => getCardValue("17")).toThrow("Error invalid card");
});

// Case 4: Hex, Decimal Numbers
test(`Should return error if the rank is a hex input`, () => {
  expect(() => getCardValue("0x02♠")).toThrow("Error invalid card");
  expect(() => getCardValue("2.1♠")).toThrow("Error invalid card");
  expect(() => getCardValue("0002♠")).toThrow("Error invalid card");
});

// 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