London | 26-ITP-Sep | Rhoda Ajiroba | Sprint 3 | Implement and Rewrite Tests

implement-and-rewrite-tests/implement-tests-with-node-test/1-get-angle-type.test.js

@@ -3,10 +3,35 @@ import test from "node:test";
 
 import { getAngleType } from "../implement/1-get-angle-type.js";
 
-// TODO: Write tests to cover all cases, including boundary and invalid cases.
-// Example: Identify Right Angles
+test("Classifies acute angles", () => {
+  assert.equal(getAngleType(45), "Acute angle");
+  assert.equal(getAngleType(1), "Acute angle");
+  assert.equal(getAngleType(89), "Acute angle");
+});
 
 test("Classifies right angles", () => {
-  const right = getAngleType(90);
-  assert.equal(right, "Right angle");
+  assert.equal(getAngleType(90), "Right angle");
+});
+
+test("Classifies obtuse angles", () => {
+  assert.equal(getAngleType(120), "Obtuse angle");
+  assert.equal(getAngleType(91), "Obtuse angle");
+  assert.equal(getAngleType(179), "Obtuse angle");
+});
+
+test("Classifies straight angles", () => {
+  assert.equal(getAngleType(180), "Straight angle");
+});
+
+test("Classifies reflex angles", () => {
+  assert.equal(getAngleType(270), "Reflex angle");
+  assert.equal(getAngleType(181), "Reflex angle");
+  assert.equal(getAngleType(359), "Reflex angle");
+});
+
+test("Identifies invalid angles", () => {
+  assert.equal(getAngleType(0), "Invalid angle");
+  assert.equal(getAngleType(360), "Invalid angle");
+  assert.equal(getAngleType(-1), "Invalid angle");
+  assert.equal(getAngleType(361), "Invalid angle");
 });

implement-and-rewrite-tests/implement-tests-with-node-test/2-is-proper-fraction.test.js

@@ -3,10 +3,31 @@ import test from "node:test";
 
 import { isProperFraction } from "../implement/2-is-proper-fraction.js";
 
-// TODO: Write tests to cover all cases.
-// What combinations of numerators and denominators should you test?
-
-test("Basic proper fraction", () => {
-  // Example: 1/2 is a proper fraction
+test("Identifies basic proper fractions", () => {
   assert.equal(isProperFraction(1, 2), true);
+  assert.equal(isProperFraction(3, 4), true);
+});
+
+test("Identifies improper fractions", () => {
+  assert.equal(isProperFraction(5, 3), false);
+  assert.equal(isProperFraction(4, 4), false);
+});
+
+test("Handles zero numerator", () => {
+  assert.equal(isProperFraction(0, 5), true);
+});
+
+test("Handles negative numerators", () => {
+  assert.equal(isProperFraction(-1, 2), true);
+  assert.equal(isProperFraction(-5, 2), false);
+});
+
+test("Handles negative denominators", () => {
+  assert.equal(isProperFraction(1, -2), true);
+  assert.equal(isProperFraction(3, -2), false);
+});
+
+test("Handles zero denominator", () => {
+  assert.equal(isProperFraction(1, 0), false);
+  assert.equal(isProperFraction(0, 0), false);
 });

implement-and-rewrite-tests/implement-tests-with-node-test/3-get-card-value.test.js

@@ -3,14 +3,35 @@ import test from "node:test";
 
 import { getCardValue } from "../implement/3-get-card-value.js";
 
-// TODO: Write tests to cover all outcomes, including throwing errors for invalid cards.
+test("Returns the correct value for number cards", () => {
+  assert.equal(getCardValue("2♠"), 2);
+  assert.equal(getCardValue("5♥"), 5);
+  assert.equal(getCardValue("9♦"), 9);
+  assert.equal(getCardValue("10♣"), 10);
+});
+
+test("Returns 11 for aces", () => {
+  assert.equal(getCardValue("A♠"), 11);
+});
 
-test("Valid single-digit card", () => {
-  assert.equal(getCardValue("9♠"), 9);
+test("Returns 10 for face cards", () => {
+  assert.equal(getCardValue("J♠"), 10);
+  assert.equal(getCardValue("Q♥"), 10);
+  assert.equal(getCardValue("K♦"), 10);
 });
 
-test("Arbitrary non-card string", () => {
-  assert.throws(() => getCardValue("invalid"), /Expected a number followed by a suit, but got "invalid"/, "Expected clear error");
+test("Accepts all four suits", () => {
+  assert.equal(getCardValue("5♠"), 5);
+  assert.equal(getCardValue("5♥"), 5);
+  assert.equal(getCardValue("5♦"), 5);
+  assert.equal(getCardValue("5♣"), 5);
 });
 
-// TODO: What other invalid card cases can you think of?
+test("Rejects invalid cards", () => {
+  assert.throws(() => getCardValue("invalid"));
+  assert.throws(() => getCardValue("1♠"));
+  assert.throws(() => getCardValue("11♠"));
+  assert.throws(() => getCardValue("5X"));
+  assert.throws(() => getCardValue("♠5"));
+  assert.throws(() => getCardValue("5"));
+});

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

@@ -17,5 +17,25 @@
 // execute the code to ensure all tests pass.
 
 export function getAngleType(angle) {
-  // TODO: Implement this function
+  if (angle <= 0 || angle >= 360) {
+    return "Invalid angle";
+  }
+
+  if (angle < 90) {
+    return "Acute angle";
+  }
+
+  if (angle === 90) {
+    return "Right angle";
+  }
+
+  if (angle < 180) {
+    return "Obtuse angle";
+  }
+
+  if (angle === 180) {
+    return "Straight angle";
+  }
+
+  return "Reflex angle";
 }

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

@@ -14,5 +14,5 @@
 // execute the code to ensure all tests pass.
 
 export function isProperFraction(numerator, denominator) {
-  // TODO: Implement this function
+  return denominator !== 0 && Math.abs(numerator) < Math.abs(denominator);
 }

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

@@ -24,5 +24,21 @@
 // execute the code to ensure all tests pass.
 
 export function getCardValue(card) {
-  // TODO: Implement this function
+  const validCard = /^(A|[2-9]|10|J|Q|K)[♠♥♦♣]$/;
+
+  if (!validCard.test(card)) {
+    throw new Error(`Expected a number followed by a suit, but got "${card}"`);
+  }
+
+  const rank = card.slice(0, -1);
+
+  if (rank === "A") {
+    return 11;
+  }
+
+  if (["J", "Q", "K"].includes(rank)) {
+    return 10;
+  }
+
+  return Number(rank);
 }

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

@@ -1,18 +1,34 @@
 import { getAngleType } from "../implement/1-get-angle-type.js";
 
-// 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
+test("Classifies acute angles", () => {
   expect(getAngleType(1)).toEqual("Acute angle");
   expect(getAngleType(45)).toEqual("Acute angle");
   expect(getAngleType(89)).toEqual("Acute angle");
 });
 
-// Case 2: Right angle
-// Case 3: Obtuse angles
-// Case 4: Straight angle
-// Case 5: Reflex angles
-// Case 6: Invalid angles
+test("Classifies right angles", () => {
+  expect(getAngleType(90)).toEqual("Right angle");
+});
+
+test("Classifies obtuse angles", () => {
+  expect(getAngleType(91)).toEqual("Obtuse angle");
+  expect(getAngleType(120)).toEqual("Obtuse angle");
+  expect(getAngleType(179)).toEqual("Obtuse angle");
+});
+
+test("Classifies straight angles", () => {
+  expect(getAngleType(180)).toEqual("Straight angle");
+});
+
+test("Classifies reflex angles", () => {
+  expect(getAngleType(181)).toEqual("Reflex angle");
+  expect(getAngleType(270)).toEqual("Reflex angle");
+  expect(getAngleType(359)).toEqual("Reflex angle");
+});
+
+test("Identifies invalid angles", () => {
+  expect(getAngleType(0)).toEqual("Invalid angle");
+  expect(getAngleType(360)).toEqual("Invalid angle");
+  expect(getAngleType(-1)).toEqual("Invalid angle");
+  expect(getAngleType(361)).toEqual("Invalid angle");
+});

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

@@ -1,8 +1,30 @@
 import { isProperFraction } from "../implement/2-is-proper-fraction.js";
 
-// TODO: Write tests in Jest syntax to cover all combinations of positives, negatives, zeros, and other categories.
+test("Identifies positive proper fractions", () => {
+  expect(isProperFraction(1, 2)).toEqual(true);
+  expect(isProperFraction(3, 4)).toEqual(true);
+});
+
+test("Identifies improper fractions", () => {
+  expect(isProperFraction(5, 3)).toEqual(false);
+  expect(isProperFraction(4, 4)).toEqual(false);
+});
+
+test("Handles zero numerator", () => {
+  expect(isProperFraction(0, 5)).toEqual(true);
+});
+
+test("Handles negative numerators", () => {
+  expect(isProperFraction(-1, 2)).toEqual(true);
+  expect(isProperFraction(-5, 2)).toEqual(false);
+});
+
+test("Handles negative denominators", () => {
+  expect(isProperFraction(1, -2)).toEqual(true);
+  expect(isProperFraction(3, -2)).toEqual(false);
+});
 
-// Special case: numerator is zero
-test(`should return false when denominator is zero`, () => {
+test("Handles zero denominator", () => {
   expect(isProperFraction(1, 0)).toEqual(false);
+  expect(isProperFraction(0, 0)).toEqual(false);
 });

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

@@ -1,18 +1,30 @@
 import { getCardValue } from "../implement/3-get-card-value.js";
 
-// TODO: Write tests in Jest syntax to cover all possible outcomes.
-
-// Case 1: Ace (A)
-test(`Should return 11 when given an ace card`, () => {
+test("Returns 11 for aces", () => {
   expect(getCardValue("A♠")).toEqual(11);
+  expect(getCardValue("A♥")).toEqual(11);
+  expect(getCardValue("A♦")).toEqual(11);
+  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
+test("Returns the correct value for number cards", () => {
+  expect(getCardValue("2♠")).toEqual(2);
+  expect(getCardValue("5♥")).toEqual(5);
+  expect(getCardValue("9♦")).toEqual(9);
+  expect(getCardValue("10♣")).toEqual(10);
+});
 
-// 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
+test("Returns 10 for face cards", () => {
+  expect(getCardValue("J♠")).toEqual(10);
+  expect(getCardValue("Q♥")).toEqual(10);
+  expect(getCardValue("K♦")).toEqual(10);
+});
 
+test("Throws an error for invalid cards", () => {
+  expect(() => getCardValue("invalid")).toThrow();
+  expect(() => getCardValue("1♠")).toThrow();
+  expect(() => getCardValue("11♠")).toThrow();
+  expect(() => getCardValue("5X")).toThrow();
+  expect(() => getCardValue("♠5")).toThrow();
+  expect(() => getCardValue("5")).toThrow();
+});

practice-tdd/count.js

@@ -1,3 +1,3 @@
 export function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  return stringOfCharacters.split(findCharacter).length - 1;
 }

practice-tdd/count.test.js

@@ -17,8 +17,17 @@ test("should count multiple occurrences of a character", () => {
   expect(count).toEqual(5);
 });
 
-// Scenario: No Occurrences
-// Given the input string `str`,
-// And a character `char` that does not exist within `str`.
-// When the function is called with these inputs,
-// Then it should return 0, indicating that no occurrences of `char` were found.
+test("should return 0 when the character does not exist", () => {
+  const str = "hello";
+  const char = "z";
+
+  const count = countChar(str, char);
+
+  expect(count).toEqual(0);
+});
+test("should count a single occurrence", () => {
+  expect(countChar("hello", "h")).toEqual(1);
+});
+test("should return 0 for an empty string", () => {
+  expect(countChar("", "a")).toEqual(0);
+});

practice-tdd/get-ordinal-number.js

@@ -1,3 +1,23 @@
 export function getOrdinalNumber(num) {
-  return "1st";
+  const lastTwoDigits = num % 100;
+
+  if (lastTwoDigits >= 11 && lastTwoDigits <= 13) {
+    return `${num}th`;
+  }
+
+  const lastDigit = num % 10;
+
+  if (lastDigit === 1) {
+    return `${num}st`;
+  }
+
+  if (lastDigit === 2) {
+    return `${num}nd`;
+  }
+
+  if (lastDigit === 3) {
+    return `${num}rd`;
+  }
+
+  return `${num}th`;
 }

practice-tdd/get-ordinal-number.test.js

@@ -18,3 +18,28 @@ test("should append 'st' for numbers ending with 1, except those ending with 11"
   expect(getOrdinalNumber(21)).toEqual("21st");
   expect(getOrdinalNumber(131)).toEqual("131st");
 });
+
+test("should append 'nd' for numbers ending in 2, except those ending in 12", () => {
+  expect(getOrdinalNumber(2)).toEqual("2nd");
+  expect(getOrdinalNumber(22)).toEqual("22nd");
+  expect(getOrdinalNumber(112)).toEqual("112th");
+});
+
+test("should append 'rd' for numbers ending in 3, except those ending in 13", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+  expect(getOrdinalNumber(23)).toEqual("23rd");
+  expect(getOrdinalNumber(113)).toEqual("113th");
+});
+
+test("should append 'th' for other numbers", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(5)).toEqual("5th");
+  expect(getOrdinalNumber(10)).toEqual("10th");
+  expect(getOrdinalNumber(20)).toEqual("20th");
+});
+
+test("should append 'th' for numbers ending in 11, 12 and 13", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(13)).toEqual("13th");
+});

practice-tdd/repeat-str.js

@@ -1,5 +1,13 @@
-export function repeatStr() {
-  // Your implementation of this function must *not* call String.prototype.repeat (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat).
-  // The goal is to re-implement that function, not to use it.
-  return "hellohellohello";
+export function repeatStr(str, count) {
+  if (count < 0) {
+    throw new Error("Count cannot be negative");
+  }
+
+  let result = "";
+
+  for (let i = 0; i < count; i++) {
+    result += str;
+  }
+
+  return result;
 }