London | 26-ITP-Sep | Bartosz Kawiak | Sprint 3 | implement-and-rewrite-tests

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

@@ -1,7 +1,5 @@
 // Implement a function getAngleType
 //
-// Don't forget to write tests in implement-tests-with-node-test.
-//
 // 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°
@@ -16,6 +14,54 @@
 // After you have implemented the function, write tests to cover all the cases, and
 // execute the code to ensure all tests pass.
 
-export function getAngleType(angle) {
-  // TODO: Implement this function
+function getAngleType(angle) {
+  if (angle > 0 && angle < 90) {
+    return `Acute angle`;
+  } else if (angle === 90) {
+    return `Right angle`;
+  } else if (angle > 90 && angle < 180) {
+    return `Obtuse angle`;
+  } else if (angle === 180) {
+    return `Straight angle`;
+  } else if (angle > 180 && angle < 360) {
+    return `Reflex angle`;
+  } else {
+    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);
+assertEquals(right, "Right angle");
+
+const acute = getAngleType(78);
+assertEquals(acute, "Acute angle");
+
+const obtuse = getAngleType(102);
+assertEquals(obtuse, "Obtuse angle");
+
+const straight = getAngleType(180);
+assertEquals(straight, "Straight angle");
+
+const reflex = getAngleType(250);
+assertEquals(reflex, "Reflex angle");
+
+const invalid = getAngleType(420);
+assertEquals(invalid, "Invalid angle");
+
+const zero = getAngleType(0);
+assertEquals(zero, "Invalid angle");

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

@@ -1,8 +1,5 @@
 // Implement a function isProperFraction,
-//
-// Don't forget to write tests in implement-tests-with-node-test.
-//
-// When given two numbers, a numerator and a denominator, it should return true if
+// 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).
@@ -13,6 +10,35 @@
 // After you have implemented the function, write tests to cover all the cases, and
 // execute the code to ensure all tests pass.
 
-export function isProperFraction(numerator, denominator) {
-  // TODO: Implement this function
+function isProperFraction(numerator, denominator) {
+  // Non-unit fractions have a numerator that is more than 1, but less than the denominator.
+  //Unit fractions all have a numerator of 1.
+
+  let validFraction =
+    Math.abs(numerator) < Math.abs(denominator) && Math.abs(numerator) > 0;
+  return validFraction;
+}
+
+// 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
+assertEquals(isProperFraction(1, 2), true);
+assertEquals(isProperFraction(1, 5), true);
+assertEquals(isProperFraction(0, 4), false);
+assertEquals(isProperFraction(5, 5), false);
+assertEquals(isProperFraction(6, 5), false);
+assertEquals(isProperFraction(3, 5), true);
+assertEquals(isProperFraction(1, 0), false);

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

@@ -1,7 +1,5 @@
 // This problem involves playing cards: https://en.wikipedia.org/wiki/Standard_52-card_deck
 
-// Don't forget to write tests in implement-tests-with-node-test.
-
 // Implement a function getCardValue, when given a string representing a playing card,
 // should return the numerical value of the card.
 
@@ -23,6 +21,82 @@
 // After you have implemented the function, write tests to cover all the cases, and
 // execute the code to ensure all tests pass.
 
-export function getCardValue(card) {
-  // TODO: Implement this function
+function getCardValue(card) {
+  let regex = /^([2-9]|10|[AJQK])[♠♥♣♦]$/;
+  const valid = regex.test(card);
+  if (!valid) {
+    throw new Error("Invalid card");
+  }
+  let rank = card.slice(0, -1);
+
+  if (rank === "A") {
+    return 11;
+  } else if (rank === "J" || rank === "Q" || rank === "K") {
+    return 10;
+  } else {
+    rank = Number(rank);
+    return rank;
+  }
+}
+
+// The line below allows us to load the getCardValue function into tests in other files.
+// This will be useful in the "rewrite tests with jest" step.
+module.exports = getCardValue;
+
+// Helper functions to make our assertions easier to read.
+function assertEquals(actualOutput, targetOutput) {
+  console.assert(
+    actualOutput === targetOutput,
+    `Expected ${actualOutput} to equal ${targetOutput}`
+  );
+}
+
+// TODO: Write tests to cover all outcomes, including throwing errors for invalid cards.
+// Examples:
+assertEquals(getCardValue("9♠"), 9);
+assertEquals(getCardValue("A♠"), 11);
+assertEquals(getCardValue("10♥"), 10);
+assertEquals(getCardValue("2♥"), 2);
+assertEquals(getCardValue("K♠"), 10);
+assertEquals(getCardValue("J♣"), 10);
+assertEquals(getCardValue("Q♦"), 10);
+
+// Handling invalid cards
+try {
+  getCardValue("invalid");
+
+  // This line will not be reached if an error is thrown as expected
+  console.error("Error was not thrown for invalid card 😢");
+} catch (e) {
+  console.log("Error thrown for invalid card 🎉");
+}
+
+// What other invalid card cases can you think of?
+
+try {
+  getCardValue(3);
+  console.error("Error was not thrown for number 3");
+} catch (e) {
+  console.log("Error thrown for invalid format");
+}
+
+try {
+  getCardValue("11K♠");
+  console.error("Error format too long");
+} catch (e) {
+  console.log("Error thrown for too many characters");
+}
+
+try {
+  getCardValue(-1);
+  console.error("Error for negative number");
+} catch (e) {
+  console.log("Error thrown for negative number");
+}
+
+try {
+  getCardValue("22♥");
+  console.error("Error for string 22♥");
+} catch (e) {
+  console.log("Error thrown for string 22♥");
 }

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

@@ -1,4 +1,6 @@
-import { getAngleType } from "../implement/1-get-angle-type.js";
+// 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.
@@ -8,11 +10,37 @@ 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(77)).toEqual("Acute angle");
+  expect(getAngleType(24)).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 (angle > 90 && angle <180)`, () => {
+  expect(getAngleType(91)).toEqual("Obtuse angle");
+  expect(getAngleType(133)).toEqual("Obtuse angle");
+  expect(getAngleType(111)).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 (angle > 180 && angle < 360)`, () => {
+  expect(getAngleType(181)).toEqual("Reflex angle");
+  expect(getAngleType(359)).toEqual("Reflex angle");
+  expect(getAngleType(199)).toEqual("Reflex angle");
+  expect(getAngleType(244)).toEqual("Reflex angle");
+});
 // Case 6: Invalid angles
+test(`should return "Invalid angle"`, () => {
+  expect(getAngleType(361)).toEqual("Invalid angle");
+  expect(getAngleType(2332)).toEqual("Invalid angle");
+  expect(getAngleType(-1)).toEqual("Invalid angle");
+  expect(getAngleType("-222r")).toEqual("Invalid angle");
+});

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

@@ -1,8 +1,41 @@
-import { isProperFraction } from "../implement/2-is-proper-fraction.js";
+// 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`, () => {
   expect(isProperFraction(1, 0)).toEqual(false);
 });
+test(`should return true when input (1, 2)`, () => {
+  expect(isProperFraction(1, 2)).toEqual(true);
+});
+test(`should return false when (numerator = 0)`, () => {
+  expect(isProperFraction(0, 4)).toEqual(false);
+});
+test(`should return false when (numerator===denominator)`, () => {
+  expect(isProperFraction(5, 5)).toEqual(false);
+});
+test(`should return false when (numerator>denominator)`, () => {
+  expect(isProperFraction(6, 5)).toEqual(false);
+});
+test(`should return false when (numerator ===0 && denominator === 0)`, () => {
+  expect(isProperFraction(0, 0)).toEqual(false);
+});
+test(`should return true when numerator is negative number`, () => {
+  expect(isProperFraction(-4, 8)).toEqual(true);
+});
+test(`should return false when numerator and denominator have equal absolute values `, () => {
+  expect(isProperFraction(-5, 5)).toEqual(false);
+});
+test(`should return true when denominator is negative `, () => {
+  expect(isProperFraction(3, -5)).toEqual(true);
+});
+test(`should return false when numerator is zero and denominator is negative zero`, () => {
+  expect(isProperFraction(0, -0)).toEqual(false);
+});
+test(`should return true when numerator and denominator are negative`, () => {
+  expect(isProperFraction(-3, -5)).toEqual(true);
+});

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

@@ -1,4 +1,6 @@
-import { getCardValue } from "../implement/3-get-card-value.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.
 
@@ -9,10 +11,36 @@ test(`Should return 11 when given an ace card`, () => {
 
 // Suggestion: Group the remaining test data into these categories:
 //   Number Cards (2-10)
+let suits = ["♠", "♥", "♣", "♦"];
+for (let number = 2; number <= 10; number++) {
+  for (let suit of suits) {
+    test(`should return card value as number`, () => {
+      expect(getCardValue(`${number}${suit}`)).toEqual(number);
+    });
+  }
+}
 //   Face Cards (J, Q, K)
+
+let chars = ["J", "Q", "K"];
+
+for (let char of chars) {
+  for (let suit of suits) {
+    test(`should return card value as 10`, () => {
+      expect(getCardValue(`${char}${suit}`)).toEqual(10);
+    });
+  }
+}
 //   Invalid Cards
 
+let invalidCards = ["22♥", "11K♠", -1, 3, "11^♠"];
+for (let card of invalidCards) {
+  test(`should return "Invalid card"`, () => {
+    expect(() => {
+      getCardValue(card);
+    }).toThrow();
+  });
+}
+
 // 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
-