Cape Town | 2026-ITP-Jan | Isaac Abodunrin | Sprint 3 | Implement and Rewrite Tests Coursework

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

@@ -1,37 +1,61 @@
-// Implement a function getAngleType
-//
-// When given an angle in degrees, it should return a string indicating the type of angle:
-// - "Acute angle" for angles greater than 0° and less than 90°
-// - "Right angle" for exactly 90°
-// - "Obtuse angle" for angles greater than 90° and less than 180°
-// - "Straight angle" for exactly 180°
-// - "Reflex angle" for angles greater than 180° and less than 360°
-// - "Invalid angle" for angles outside the valid range.
-
-// Assumption: The parameter is a valid number. (You do not need to handle non-numeric inputs.)
-
-// 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 getAngleType(angle) {
-  // TODO: Implement this function
+  // Ensure non-numbers are treated as an invalid angles
+  if (typeof angle != "number") return "Invalid angle";
+
+  if (angle > 0 && angle < 90) return "Acute angle";
+  if (angle === 90) return "Right angle";
+  if (angle > 90 && angle < 180) return "Obtuse angle";
+  if (angle === 180) return "Straight angle";
+  if (angle > 180 && angle < 360) return "Reflex angle";
+
+  return "Invalid angle";
 }
 
-// The line below allows us to load the getAngleType function into tests in other files.
-// This will be useful in the "rewrite tests with jest" step.
 module.exports = getAngleType;
 
-// This helper function is written to make our assertions easier to read.
-// If the actual output matches the target output, the test will pass
 function assertEquals(actualOutput, targetOutput) {
   console.assert(
     actualOutput === targetOutput,
     `Expected ${actualOutput} to equal ${targetOutput}`
   );
 }
 
-// TODO: Write tests to cover all cases, including boundary and invalid cases.
-// Example: Identify Right Angles
-const right = getAngleType(90);
+// Acute Angles Test
+let acute = getAngleType(45);
+assertEquals(acute, "Acute angle");
+
+// Right Angles Test
+let right = getAngleType(90);
 assertEquals(right, "Right angle");
+
+// Obtuse Angles Test
+let obtuse = getAngleType(120);
+assertEquals(obtuse, "Obtuse angle");
+
+// Straight Angles Test
+let straight = getAngleType(180);
+assertEquals(straight, "Straight angle");
+
+// Reflex Angles Test
+let reflex = getAngleType(200);
+assertEquals(reflex, "Reflex angle");
+
+// Invalid Angles Test
+let invalid = getAngleType(0);
+assertEquals(invalid, "Invalid angle");
+
+// Invalid Angles Test
+invalid = getAngleType(360);
+assertEquals(invalid, "Invalid angle");
+
+// Invalid Angles Test
+invalid = getAngleType(500);
+assertEquals(invalid, "Invalid angle");
+
+// Invalid Angles Test
+invalid = getAngleType(-200);
+assertEquals(invalid, "Invalid angle");
+
+// Test for float inputs
+acute = getAngleType(34.333);
+assertEquals(acute, "Acute angle");

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

@@ -1,33 +1,28 @@
-// Implement a function isProperFraction,
-// when given two numbers, a numerator and a denominator, it should return true if
-// the given numbers form a proper fraction, and false otherwise.
-
-// Assumption: The parameters are valid numbers (not NaN or Infinity).
-
-// Note: If you are unfamiliar with proper fractions, please look up its mathematical definition.
-
-// 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 isProperFraction(numerator, denominator) {
-  // TODO: Implement this function
+  // Return non numeric numerators and denominators as false
+  if (typeof numerator != "number" || typeof denominator != "number")
+    return false;
+
+  return Math.abs(numerator) < Math.abs(denominator);
 }
 
-// The line below allows us to load the isProperFraction function into tests in other files.
-// This will be useful in the "rewrite tests with jest" step.
 module.exports = isProperFraction;
 
-// Here's our helper again
 function assertEquals(actualOutput, targetOutput) {
   console.assert(
     actualOutput === targetOutput,
     `Expected ${actualOutput} to equal ${targetOutput}`
   );
 }
 
-// TODO: Write tests to cover all cases.
-// What combinations of numerators and denominators should you test?
-
-// Example: 1/2 is a proper fraction
+// Positive proper fraction test
 assertEquals(isProperFraction(1, 2), true);
+
+// Improper proper fraction test
+assertEquals(isProperFraction(3, 2), false);
+
+// Negative proper fraction test
+assertEquals(isProperFraction(-1, 2), true);
+
+// Zero numerator test
+assertEquals(isProperFraction(0, 2), true);

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

@@ -1,28 +1,43 @@
-// This problem involves playing cards: https://en.wikipedia.org/wiki/Standard_52-card_deck
-
-// Implement a function getCardValue, when given a string representing a playing card,
-// should return the numerical value of the card.
-
-// A valid card string will contain a rank followed by the suit.
-// The rank can be one of the following strings:
-//   "A", "2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K"
-// The suit can be one of the following emojis:
-//   "♠", "♥", "♦", "♣"
-// For example: "A♠", "2♥", "10♥", "J♣", "Q♦", "K♦".
+function getCardValue(card) {
+  // Ensure that the last char is a suit, otherwise throw an error
+  const suits = ["♠", "♥", "♦", "♣"];
+  if (!suits.includes(card.slice(-1))) {
+    throw new Error("Please add the suit to the card face i.e. '5♥' ");
+  }
 
-// When the card is an ace ("A"), the function should return 11.
-// When the card is a face card ("J", "Q", "K"), the function should return 10.
-// When the card is a number card ("2" to "10"), the function should return its numeric value.
+  const rank = card.slice(0, -1);
+  const validRank = [
+    "A",
+    "2",
+    "3",
+    "4",
+    "5",
+    "6",
+    "7",
+    "8",
+    "9",
+    "10",
+    "J",
+    "Q",
+    "K",
+  ];
 
-// When the card string is invalid (not following the above format), the function should
-// throw an error.
+  // Throw an error if an invalid card is entered
+  if (!validRank.includes(rank)) {
+    throw new Error("Please enter a valid card face");
+  }
 
-// Acceptance criteria:
-// After you have implemented the function, write tests to cover all the cases, and
-// execute the code to ensure all tests pass.
+  // Return value if card rank is a number
+  if (parseInt(rank)) {
+    return parseInt(rank);
+  }
 
-function getCardValue(card) {
-  // TODO: Implement this function
+  // Return 11 for "A" and 10 for "J", "Q", "K"
+  if (rank === "A") {
+    return 11;
+  } else {
+    return 10;
+  }
 }
 
 // The line below allows us to load the getCardValue function into tests in other files.
@@ -37,16 +52,48 @@ function assertEquals(actualOutput, targetOutput) {
   );
 }
 
-// TODO: Write tests to cover all outcomes, including throwing errors for invalid cards.
-// Examples:
+// ============= Valid Card Tests ===========
+assertEquals(getCardValue("A♠"), 11);
+assertEquals(getCardValue("K♥"), 10);
+assertEquals(getCardValue("Q♦"), 10);
+assertEquals(getCardValue("J♣"), 10);
 assertEquals(getCardValue("9♠"), 9);
+assertEquals(getCardValue("2♥"), 2);
 
-// Handling invalid cards
+// ============= Invalid Card Tests ===========
+let invalidCard = "invalid";
 try {
-  getCardValue("invalid");
+  getCardValue(invalidCard);
+  console.error(`Error was not thrown for an invalid card (${invalidCard})`);
+} catch (e) {}
 
-  // This line will not be reached if an error is thrown as expected
-  console.error("Error was not thrown for invalid card");
+invalidCard = 7;
+try {
+  getCardValue(invalidCard);
+  console.error(`Error was not thrown for an invalid card (${invalidCard})`);
+} catch (e) {}
+
+invalidCard = "";
+try {
+  getCardValue(invalidCard);
+  console.error(`Error was not thrown for an invalid card (${invalidCard})`);
 } catch (e) {}
 
-// What other invalid card cases can you think of?
+invalidCard = "AA♠";
+try {
+  getCardValue(invalidCard);
+  console.error(`Error was not thrown for an invalid card (${invalidCard})`);
+} catch (e) {}
+
+invalidCard = "10♠♦";
+try {
+  getCardValue(invalidCard);
+  console.error(`Error was not thrown for an invalid card (${invalidCard})`);
+} catch (e) {}
+
+invalidCard = "10";
+try {
+  console.log(getCardValue(invalidCard));
+  getCardValue(invalidCard);
+  console.error(`Error was not thrown for an invalid card (${invalidCard})`);
+} catch (e) {}

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

@@ -1,20 +1,43 @@
-// This statement loads the getAngleType function you wrote in the implement directory.
-// We will use the same function, but write tests for it using Jest in this file.
 const getAngleType = require("../implement/1-get-angle-type");
 
-// TODO: Write tests in Jest syntax to cover all cases/outcomes,
-// including boundary and invalid cases.
-
 // 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(91.0)).toEqual("Obtuse angle");
+  expect(getAngleType(100)).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
+test(`should return "Reflex angle" when (180 < angle < 360)`, () => {
+  expect(getAngleType(181)).toEqual("Reflex angle");
+  expect(getAngleType(200)).toEqual("Reflex angle");
+  expect(getAngleType(359)).toEqual("Reflex angle");
+});
+
 // Case 6: Invalid angles
+test(`should return "Invalid angle" when angle doesn't lie between 0-360 exclusive`, () => {
+  expect(getAngleType(0)).toEqual("Invalid angle");
+  expect(getAngleType(360)).toEqual("Invalid angle");
+  expect(getAngleType(500)).toEqual("Invalid angle");
+  expect(getAngleType(-200)).toEqual("Invalid angle");
+  expect(getAngleType("")).toEqual("Invalid angle");
+  expect(getAngleType("ten degrees")).toEqual("Invalid angle");
+  expect(getAngleType(true)).toEqual("Invalid angle");
+});

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

@@ -1,10 +1,58 @@
-// This statement loads the isProperFraction function you wrote in the implement directory.
-// We will use the same function, but write tests for it using Jest in this file.
 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.
-
-// Special case: numerator is zero
-test(`should return false when denominator is zero`, () => {
+// Case 1: numerator/denominator is zero
+test(`should return false when either numerator or denominator is zero`, () => {
   expect(isProperFraction(1, 0)).toEqual(false);
+  expect(isProperFraction(0, 0)).toEqual(false);
+});
+
+// Case 2: numerator and denominator are positive integers and form proper fractions
+test(`should return true when either numerator is smaller than denominator`, () => {
+  expect(isProperFraction(1, 2)).toEqual(true);
+  expect(isProperFraction(1, 10)).toEqual(true);
+  expect(isProperFraction(9, 100)).toEqual(true);
+  expect(isProperFraction(0, 1)).toEqual(true);
+});
+
+// Case 3: numerator and denominator are negative and make proper fractions
+test(`should return true when absolute of numerator is smaller than absolute of denominator`, () => {
+  expect(isProperFraction(-1, 2)).toEqual(true);
+  expect(isProperFraction(1, -10)).toEqual(true);
+  expect(isProperFraction(-9, -100)).toEqual(true);
+});
+
+// Case 4: numerator/denominator is decimal and make proper fractions
+test(`should return true when decimal numerator is smaller than decimal denominator`, () => {
+  expect(isProperFraction(0.5, 2)).toEqual(true);
+  expect(isProperFraction(1.2, -10)).toEqual(true);
+  expect(isProperFraction(-9, -9.5)).toEqual(true);
+});
+
+// Case 5: numerator and denominator are positive integers and not proper fractions
+test(`should return false when numerator is greater than denominator`, () => {
+  expect(isProperFraction(2, 1)).toEqual(false);
+  expect(isProperFraction(10, 1)).toEqual(false);
+  expect(isProperFraction(100, 9)).toEqual(false);
+});
+
+// Case 6: numerator and denominator are negative and not proper fractions
+test(`should return false when absolute of numerator is greater than absolute of denominator`, () => {
+  expect(isProperFraction(-2, 1)).toEqual(false);
+  expect(isProperFraction(10, -1)).toEqual(false);
+  expect(isProperFraction(-100, -9)).toEqual(false);
+});
+
+// Case 7: numerator/denominator is decimal and not proper fractions
+test(`should return false when numerator is greater than denominator`, () => {
+  expect(isProperFraction(2.5, 1)).toEqual(false);
+  expect(isProperFraction(10.2, 1)).toEqual(false);
+  expect(isProperFraction(100.5, 9.001)).toEqual(false);
+});
+
+// Case 8: numerator/denominator is not numeric
+test(`should return false when either numerator or denominator is not numeric`, () => {
+  expect(isProperFraction(false, 1)).toEqual(false);
+  expect(isProperFraction(true, 1)).toEqual(false);
+  expect(isProperFraction("10.2", 1)).toEqual(false);
+  expect(isProperFraction("", 9.001)).toEqual(false);
 });