adding tests for card values in blackjack

Author: TzeMingHo

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

@@ -8,9 +8,18 @@
 // write one test at a time, and make it pass, build your solution up methodically
 // just make one change at a time -- don't rush -- programmers are deep and careful thinkers
 function getCardValue(card) {
+  const rank = card.slice(0, -1);
   if (rank === "A") {
     return 11;
   }
+  if (rank === "K" || rank === "Q" || rank === "J" || rank === "10") {
+    return 10;
+  }
+  const numericRank = Number(rank);
+  if (numericRank >= 2 && numericRank <= 9) {
+    return numericRank;
+  }
+  return "Error: Invalid card rank";
 }
 
 // The line below allows us to load the getCardValue function into tests in other files.
@@ -31,27 +40,44 @@ function assertEquals(actualOutput, targetOutput) {
 // Given a card string in the format "A♠" (representing a card in blackjack - the last character will always be an emoji for a suit, and all characters before will be a number 2-10, or one letter of J, Q, K, A),
 // When the function getCardValue is called with this card string as input,
 // Then it should return the numerical card value
-const aceofSpades = getCardValue("A♠");
-assertEquals(aceofSpades, 11);
+const aceOfSpades = getCardValue("A♠");
+assertEquals(aceOfSpades, 11);
 
 // Handle Number Cards (2-10):
 // Given a card with a rank between "2" and "9",
 // When the function is called with such a card,
 // Then it should return the numeric value corresponding to the rank (e.g., "5" should return 5).
-const fiveofHearts = getCardValue("5♥");
+const nineOfHearts = getCardValue("9♥");
 // ====> write your test here, and then add a line to pass the test in the function above
+assertEquals(nineOfHearts, 9);
 
 // Handle Face Cards (J, Q, K):
 // Given a card with a rank of "10," "J," "Q," or "K",
 // When the function is called with such a card,
 // Then it should return the value 10, as these cards are worth 10 points each in blackjack.
+const kingOfDiamonds = getCardValue("K♦");
+assertEquals(kingOfDiamonds, 10);
+const queenOfClubs = getCardValue("Q♣");
+assertEquals(queenOfClubs, 10);
+const jackOfHearts = getCardValue("J♥");
+assertEquals(jackOfHearts, 10);
+const tenOfSpades = getCardValue("10♠");
+assertEquals(tenOfSpades, 10);
 
 // Handle Ace (A):
 // Given a card with a rank of "A",
 // When the function is called with an Ace,
 // Then it should, by default, assume the Ace is worth 11 points, which is a common rule in blackjack.
+const aceOfHearts = getCardValue("A♥");
+assertEquals(aceOfHearts, 11);
 
 // Handle Invalid Cards:
 // Given a card with an invalid rank (neither a number nor a recognized face card),
 // When the function is called with such a card,
 // Then it should throw an error indicating "Invalid card rank."
+const invalidCard = "1♠";
+assertEquals(invalidCard, "Error: Invalid card rank");
+const anotherInvalidCard = "Z♠";
+assertEquals(anotherInvalidCard, "Error: Invalid card rank");
+const emptyCard = "";
+assertEquals(emptyCard, "Error: Invalid card rank");

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

@@ -3,11 +3,55 @@
 const getCardValue = require("../implement/3-get-card-value");
 
 test("should return 11 for Ace of Spades", () => {
-  const aceofSpades = getCardValue("A♠");
-  expect(aceofSpades).toEqual(11);
+  const aceOfSpades = getCardValue("A♠");
+  expect(aceOfSpades).toEqual(11);
 });
 
 // Case 2: Handle Number Cards (2-10):
+test("should return 9 for Nine of Hearts", () => {
+  const nineOfHearts = getCardValue("9♥");
+  expect(nineOfHearts).toEqual(9);
+});
+test("should return 5 for Five of Hearts", () => {
+  const fiveOfHearts = getCardValue("5♥");
+  expect(fiveOfHearts).toEqual(5);
+});
+test("should return 2 for Two of Diamonds", () => {
+  const twoOfDiamonds = getCardValue("2♦");
+  expect(twoOfDiamonds).toEqual(2);
+});
 // Case 3: Handle Face Cards (J, Q, K):
+test("should return 10 for King of Diamonds", () => {
+  const kingOfDiamonds = getCardValue("K♦");
+  expect(kingOfDiamonds).toEqual(10);
+});
+test("should return 10 for Queen of Clubs", () => {
+  const queenOfClubs = getCardValue("Q♣");
+  expect(queenOfClubs).toEqual(10);
+});
+test("should return 10 for Jack of Hearts", () => {
+  const jackOfHearts = getCardValue("J♥");
+  expect(jackOfHearts).toEqual(10);
+});
+test("should return 10 for Ten of Spades", () => {
+  const tenOfSpades = getCardValue("10♠");
+  expect(tenOfSpades).toEqual(10);
+});
 // Case 4: Handle Ace (A):
+test("should return 11 for Ace of Hearts", () => {
+  const aceOfHearts = getCardValue("A♥");
+  expect(aceOfHearts).toEqual(11);
+});
 // Case 5: Handle Invalid Cards:
+test("should throw an error for invalid card rank", () => {
+  const invalidCard = getCardValue("1♠");
+  expect(invalidCard).toEqual("Error: Invalid card rank");
+});
+test("should throw an error for another invalid card rank", () => {
+  const anotherInvalidCard = getCardValue("Z♠");
+  expect(anotherInvalidCard).toEqual("Error: Invalid card rank");
+});
+test("should throw an error for empty card string", () => {
+  const emptyCard = getCardValue("");
+  expect(emptyCard).toEqual("Error: Invalid card rank");
+});