London | Jan2026 | Ihor Taradaiko | Sprint 3 | Sprint-3-implement-and-rewrite

Sprint-3/1-implement-and-rewrite-tests/implement/1-get-angle-type.js

@@ -16,6 +16,18 @@
 
 function getAngleType(angle) {
   // TODO: Implement this function
+  if (angle <= 0 || angle >= 360) 
+    return "Invalid angle";
+  if (angle < 90) 
+    return "Acute angle";
+  else if (angle === 90) 
+    return "Right angle";
+  else if (angle < 180) 
+    return "Obtuse angle"
+  else if (angle === 180) 
+    return "Straight angle"
+  else 
+    return "Reflex angle";
 }
 
 // The line below allows us to load the getAngleType function into tests in other files.
@@ -33,5 +45,29 @@ function assertEquals(actualOutput, targetOutput) {
 
 // TODO: Write tests to cover all cases, including boundary and invalid cases.
 // Example: Identify Right Angles
-const right = getAngleType(90);
-assertEquals(right, "Right angle");
+// const right = getAngleType(90);
+// Acute: (0, 90)
+assertEquals(getAngleType(1), "Acute angle");
+assertEquals(getAngleType(89), "Acute angle");
+
+// Right: 90
+assertEquals(getAngleType(90), "Right angle");
+
+// Obtuse: (90, 180)
+assertEquals(getAngleType(91), "Obtuse angle");
+assertEquals(getAngleType(179), "Obtuse angle");
+
+// Straight: 180
+assertEquals(getAngleType(180), "Straight angle");
+
+// Reflex: (180, 360)
+assertEquals(getAngleType(181), "Reflex angle");
+assertEquals(getAngleType(359), "Reflex angle");
+
+// Invalid: outside valid range
+assertEquals(getAngleType(0), "Invalid angle");
+assertEquals(getAngleType(-10), "Invalid angle");
+assertEquals(getAngleType(360), "Invalid angle");
+assertEquals(getAngleType(361), "Invalid angle");
+
+console.log("All tests passed!");

Sprint-3/1-implement-and-rewrite-tests/implement/2-is-proper-fraction.js

@@ -12,6 +12,10 @@
 
 function isProperFraction(numerator, denominator) {
   // TODO: Implement this function
+  if (denominator === 0) return false;
+  if (denominator < 0) return false;
+
+  return Math.abs(numerator) < denominator;
 }
 
 // The line below allows us to load the isProperFraction function into tests in other files.
@@ -31,3 +35,24 @@ function assertEquals(actualOutput, targetOutput) {
 
 // Example: 1/2 is a proper fraction
 assertEquals(isProperFraction(1, 2), true);
+
+// Improper fractions (numerator > denominator)
+assertEquals(isProperFraction(2, 1), false);
+assertEquals(isProperFraction(5, 4), false);
+
+// Equal numerator/denominator is not proper
+assertEquals(isProperFraction(5, 5), false);
+
+// Zero numerator: 
+assertEquals(isProperFraction(0, 3), true);
+
+// Negative numerator:
+assertEquals(isProperFraction(-1, 2), true);
+assertEquals(isProperFraction(-3, 2), false);
+
+// Denominator edge cases
+assertEquals(isProperFraction(1, 0), false);  
+assertEquals(isProperFraction(1, -2), false); 
+assertEquals(isProperFraction(-1, -2), false);
+
+console.log ("All tests passed!")

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

@@ -20,9 +20,21 @@
 // Acceptance criteria:
 // After you have implemented the function, write tests to cover all the cases, and
 // execute the code to ensure all tests pass.
-
 function getCardValue(card) {
-  // TODO: Implement this function
+  // Validate input type
+  if (typeof card !== "string") {
+    throw new Error("Card must be a string");
+  }
+  const validSuits = ["♠", "♥", "♦", "♣"];
+  const validRanks = ["A", "2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K"];
+  const suit = card.slice(-1);
+  const rank = card.slice(0, card.length - 1);
+  if (!validSuits.includes(suit) || !validRanks.includes(rank)) {
+    throw new Error(`Invalid card format: ${card}`);
+  }
+  if (rank === "A") return 11;
+  if (["J", "Q", "K"].includes(rank)) return 10;
+  return parseInt(rank, 10);
 }
 
 // The line below allows us to load the getCardValue function into tests in other files.
@@ -39,8 +51,13 @@ function assertEquals(actualOutput, targetOutput) {
 
 // TODO: Write tests to cover all outcomes, including throwing errors for invalid cards.
 // Examples:
+assertEquals(getCardValue("A♠"), 11);
+assertEquals(getCardValue("2♥"), 2);
+assertEquals(getCardValue("10♦"), 10);
+assertEquals(getCardValue("J♣"), 10);
+assertEquals(getCardValue("Q♠"), 10);
+assertEquals(getCardValue("K♥"), 10);
 assertEquals(getCardValue("9♠"), 9);
-
 // Handling invalid cards
 try {
   getCardValue("invalid");
@@ -50,3 +67,11 @@ try {
 } catch (e) {}
 
 // What other invalid card cases can you think of?
+  // "invalid",  / not following format
+  // "1♠",        invalid rank
+  // "11♣",       invalid rank
+  // "A",         missing suit
+  // "♠",        missing rank
+  // "A♦♦",      invalid format
+  // 5,           not a string
+  // "",          empty string

Sprint-3/1-implement-and-rewrite-tests/rewrite-tests-with-jest/1-get-angle-type.test.js

@@ -7,14 +7,44 @@ const getAngleType = require("../implement/1-get-angle-type");
 
 // Case 1: Acute angles
 test(`should return "Acute angle" when (0 < angle < 90)`, () => {
-  // Test various acute angles, including boundary cases
   expect(getAngleType(1)).toEqual("Acute angle");
   expect(getAngleType(45)).toEqual("Acute angle");
   expect(getAngleType(89)).toEqual("Acute angle");
 });
 
 // Case 2: Right angle
+test(`should return "Right angle" when (angle = 90)`, () => {
+  expect(getAngleType(90)).toEqual("Right angle");
+});
+
 // Case 3: Obtuse angles
+test(`should return "Obtuse angle" when (90 < angle < 180)`, () => {
+  expect(getAngleType(91)).toEqual("Obtuse angle");
+  expect(getAngleType(120)).toEqual("Obtuse angle");
+  expect(getAngleType(179)).toEqual("Obtuse angle");
+});
+
 // Case 4: Straight angle
+test(`should return "Straight angle" when (angle = 180)`, () => {
+  expect(getAngleType(180)).toEqual("Straight angle");
+});
+
 // Case 5: Reflex angles
-// Case 6: Invalid angles
+test(`should return "Reflex angle" when (180 < angle < 360)`, () => {
+  expect(getAngleType(181)).toEqual("Reflex angle");
+  expect(getAngleType(270)).toEqual("Reflex angle");
+  expect(getAngleType(359)).toEqual("Reflex angle");
+});
+
+
+// Case 7: Invalid angles
+test(`should return "Invalid angle" when the angle is 0, negative, or over 360`, () => {
+  expect(getAngleType(0)).toEqual("Invalid angle");
+  expect(getAngleType(-10)).toEqual("Invalid angle");
+  expect(getAngleType(361)).toEqual("Invalid angle");
+  expect(getAngleType(720)).toEqual("Invalid angle");
+  expect(getAngleType(360)).toEqual("Invalid angle");
+
+});
+
+

Sprint-3/1-implement-and-rewrite-tests/rewrite-tests-with-jest/2-is-proper-fraction.test.js

@@ -3,8 +3,45 @@
 const isProperFraction = require("../implement/2-is-proper-fraction");
 
 // TODO: Write tests in Jest syntax to cover all combinations of positives, negatives, zeros, and other categories.
+describe("isProperFraction", () => {
+  // Denominator zero case
+  test("should return false when denominator is zero", () => {
+    expect(isProperFraction(1, 0)).toBe(false);
+  });
 
-// Special case: numerator is zero
-test(`should return false when denominator is zero`, () => {
-  expect(isProperFraction(1, 0)).toEqual(false);
-});
+  // Denominator negative case
+  test("should return false when denominator is negative", () => {
+    expect(isProperFraction(1, -5)).toBe(false);
+    expect(isProperFraction(-3, -4)).toBe(false);
+  });
+
+  // Proper positive fraction (numerator < denominator)
+  test("should return true for positive proper fractions", () => {
+    expect(isProperFraction(1, 2)).toBe(true);
+    expect(isProperFraction(3, 4)).toBe(true);
+  });
+
+  // Improper positive fraction (numerator >= denominator)
+  test("should return false for improper positive fractions", () => {
+    expect(isProperFraction(4, 3)).toBe(false);
+    expect(isProperFraction(5, 5)).toBe(false);
+  });
+
+  // Negative numerators (proper fraction)
+  test("should return true for negative proper fractions", () => {
+    expect(isProperFraction(-1, 3)).toBe(true);
+  });
+
+  // Negative numerators that make fraction improper
+  test("should return false for negative improper fractions", () => {
+    expect(isProperFraction(-5, 5)).toBe(false);
+  });
+
+  // Mixed sign case (denominator positive, numerator positive/negative)
+  test("should handle mixed signs correctly", () => {
+    expect(isProperFraction(2, 3)).toBe(true);
+    expect(isProperFraction(-2, 3)).toBe(true);
+    expect(isProperFraction(4, 3)).toBe(false);
+    expect(isProperFraction(-4, 3)).toBe(false);
+  });
+});

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

@@ -2,19 +2,64 @@
 // 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
 
+
 // 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
+// [https://jestjs.io/docs/expect#tothrowerror](https://jestjs.io/docs/expect#tothrowerror)
+
+
+// Number Cards (2–10)
+test(`Should return 2 when given "2♦"`, () => {
+  expect(getCardValue("2♦")).toEqual(2);
+});
+
+test(`Should return 5 when given "5♣"`, () => {
+  expect(getCardValue("5♣")).toEqual(5);
+});
+
+test(`Should return 10 when given "10♥"`, () => {
+  expect(getCardValue("10♥")).toEqual(10);
+});
+
 
+// Face Cards (J, Q, K)
+test(`Should return 10 when given "J♣"`, () => {
+  expect(getCardValue("J♣")).toEqual(10);
+});
+
+test(`Should return 10 when given "Q♦"`, () => {
+  expect(getCardValue("Q♦")).toEqual(10);
+});
+
+test(`Should return 10 when given "K♥"`, () => {
+  expect(getCardValue("K♥")).toEqual(10);
+});
+
+
+// Invalid Cards
+test(`Should throw an error when given an invalid card symbol like "Z♠"`, () => {
+  expect(() => getCardValue("Z♠")).toThrowError();
+});
+
+test(`Should throw an error when given an empty string`, () => {
+  expect(() => getCardValue("")).toThrowError();
+});
+
+test(`Should throw an error when given null`, () => {
+  expect(() => getCardValue(null)).toThrowError();
+});