Birmingham | ITP Jan-2026 | Arunkumar Akilan | Sprint 3 | Implement and Rewrite Tests

Sprint-3/1-implement-and-rewrite-tests/README.md

@@ -5,14 +5,13 @@ to choose test values that thoroughly test a function.
 
 ## 1 Implement solutions
 
-In the `implement` directory you've got a number of functions you'll need to implement.
-For each function, you also have a number of different cases you'll need to check for your function.
+Here is a recommended order:
 
-Write your assertions and build up your program case by case. Don't rush to a solution. The point of these assignments is to learn how to write assertions and build up a program step by step.
+1. `1-get-angle-type.js`In the `implement` directory you've got a number of functions you'll need to implement.
+   For each function, you also have a number of different cases you'll need to check for your function.
 
-Here is a recommended order:
+Write your assertions and build up your program case by case. Don't rush to a solution. The point of these assignments is to learn how to write assertions and build up a program step by step.
 
-1. `1-get-angle-type.js`
 2. `2-is-proper-fraction.js`
 3. `3-get-card-value.js`
 

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

@@ -15,7 +15,19 @@
 // execute the code to ensure all tests pass.
 
 function getAngleType(angle) {
-  // TODO: Implement this function
+  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.
@@ -27,11 +39,29 @@ module.exports = getAngleType;
 function assertEquals(actualOutput, targetOutput) {
   console.assert(
     actualOutput === targetOutput,
-    `Expected ${actualOutput} to equal ${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);
+let invalid = getAngleType(0);
+assertEquals(invalid, "Invalid angle");
+let acute = getAngleType(1);
+assertEquals(acute, "Acute angle");
+acute = getAngleType(89);
+assertEquals(acute, "Acute angle");
+let right = getAngleType(90);
 assertEquals(right, "Right angle");
+let obtuse = getAngleType(91);
+assertEquals(obtuse, "Obtuse angle");
+obtuse = getAngleType(179);
+assertEquals(obtuse, "Obtuse angle");
+const straight = getAngleType(180);
+assertEquals(straight, "Straight angle");
+let reflex = getAngleType(181);
+assertEquals(reflex, "Reflex angle");
+reflex = getAngleType(359);
+assertEquals(reflex, "Reflex angle");
+invalid = getAngleType(400);
+assertEquals(invalid, "Invalid angle");

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

@@ -11,7 +11,11 @@
 // execute the code to ensure all tests pass.
 
 function isProperFraction(numerator, denominator) {
-  // TODO: Implement this function
+  if (denominator === 0) {
+    return false;
+  } 
+      return Math.abs(numerator) < Math.abs(denominator);
+
 }
 
 // The line below allows us to load the isProperFraction function into tests in other files.
@@ -22,7 +26,7 @@ module.exports = isProperFraction;
 function assertEquals(actualOutput, targetOutput) {
   console.assert(
     actualOutput === targetOutput,
-    `Expected ${actualOutput} to equal ${targetOutput}`
+    `Expected ${actualOutput} to equal ${targetOutput}`,
   );
 }
 
@@ -31,3 +35,10 @@ function assertEquals(actualOutput, targetOutput) {
 
 // Example: 1/2 is a proper fraction
 assertEquals(isProperFraction(1, 2), true);
+assertEquals(isProperFraction(5, 4), false);
+assertEquals(isProperFraction(3, 3), false);
+assertEquals(isProperFraction(0, 5), true);
+assertEquals(isProperFraction(1, 0), false);
+assertEquals(isProperFraction(-1, 2), true);
+assertEquals(isProperFraction(1, -2), true);
+assertEquals(isProperFraction(-1, -2), true);

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

@@ -22,31 +22,86 @@
 // execute the code to ensure all tests pass.
 
 function getCardValue(card) {
-  // TODO: Implement this function
+  if (typeof card !== "string" || card.length < 2) {
+    throw new Error("Invalid card");
+  }
+  const suit = card.slice(-1);
+  const rank = card.slice(0, -1);
+
+  const validSuits = ["♠", "♥", "♦", "♣"];
+  const validRanks = [
+    "A",
+    "2",
+    "3",
+    "4",
+    "5",
+    "6",
+    "7",
+    "8",
+    "9",
+    "10",
+    "J",
+    "Q",
+    "K",
+  ];
+
+  if (!validSuits.includes(suit) || !validRanks.includes(rank)) {
+    throw new Error("Invalid card");
+  } else if (rank == "A") {
+    return 11;
+  } else if (["J", "Q", "K"].includes(rank)) {
+    return 10;
+  } else {
+    return Number(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;
 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}`
+    `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("K♦"), 10);
+assertEquals(getCardValue("10♥"), 10);
 
 // Handling invalid cards
 try {
-  getCardValue("invalid");
+  getCardValue("11♠");
+  console.error("Error was not thrown for invalid card");
+} catch (e) {}
+try {
+  getCardValue("A?");
+  console.error("Error was not thrown for invalid card");
+} catch (e) {}
+try {
+  getCardValue("A");
+
+  console.error("Error was not thrown for invalid card");
+} catch (e) {}
+try {
+  getCardValue(10);
 
-  // This line will not be reached if an error is thrown as expected
   console.error("Error was not thrown for invalid card");
 } catch (e) {}
 
 // What other invalid card cases can you think of?
+//try {
+//getCardValue("AA");
+//console.error("Error was not thrown for invalid card");
+//} catch (e) {}
+//try {
+//getCardValue("1♠");
+
+//console.error("Error was not thrown for invalid card");
+//} catch (e) {}

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

@@ -9,9 +9,27 @@ const getAngleType = require("../implement/1-get-angle-type");
 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");
 });
+test(`should return "Right angle" when (angle = 90)`, () => {
+  expect(getAngleType(90)).toEqual("Right angle");
+});
+test(`should return"Obtuse angle" when (90 < angle< 180)`, () => {
+  expect(getAngleType(91)).toEqual("Obtuse angle");
+  expect(getAngleType(179)).toEqual("Obtuse angle");
+});
+test(`should return "Straight angle" when ( angle = 180)`, () => {
+  expect(getAngleType(180)).toEqual("Straight angle");
+});
+test(`should return "Reflex angle" when (180 < angle <360)`, () => {
+  expect(getAngleType(181)).toEqual("Reflex angle");
+  expect(getAngleType(359)).toEqual("Reflex angle");
+});
+test(`should return "invalid angle when angles outside the valid range`, () => {
+  expect(getAngleType(0)).toEqual("Invalid angle");
+   expect(getAngleType(360)).toEqual("Invalid angle");
+   expect(getAngleType(-10)).toEqual("Invalid angle");
+});
 
 // Case 2: Right angle
 // Case 3: Obtuse angles

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

@@ -4,7 +4,24 @@ 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 numerator is zero`, () => {
+  expect(isProperFraction(0, 5)).toEqual(true);
+});
+test(`should return true when denominator is greater than numerator`, () => {
+  expect(isProperFraction(1, 2)).toEqual(true);
+});
+test(`should return false when numerator is greater than denominator`, () => {
+  expect(isProperFraction(5, 4)).toEqual(false);
+});
+test(`should return false when numerator is equals to denominator`, () => {
+  expect(isProperFraction(3, 3)).toEqual(false);
+});
+test("should return true when abs(numerator) < abs(denominator)", () => {
+  expect(isProperFraction(-1, 2)).toEqual(true);
+  expect(isProperFraction(1, -2)).toEqual(true);
+  expect(isProperFraction(-1, -2)).toEqual(true);
+});

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

@@ -8,13 +8,37 @@ const getCardValue = require("../implement/3-get-card-value");
 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)
+test("should return the value of number cards (2–10)", () => {
+  expect(getCardValue("2♣")).toEqual(2);
+  expect(getCardValue("5♦")).toEqual(5);
+  expect(getCardValue("9♥")).toEqual(9);
+  expect(getCardValue("10♠")).toEqual(10);
+});
 //   Face Cards (J, Q, K)
+test("should return 10 for face cards", () => {
+  expect(getCardValue("J♣")).toEqual(10);
+  expect(getCardValue("Q♦")).toEqual(10);
+  expect(getCardValue("K♥")).toEqual(10);
+});
 //   Invalid Cards
+test("should throw error for invalid ranks", () => {
+  expect(() => getCardValue("11♠")).toThrow();
+});
+
+test("should throw error for invalid suits", () => {
+  expect(() => getCardValue("A?")).toThrow();
+});
+
+test("should throw error for missing suits", () => {
+  expect(() => getCardValue("A")).toThrow();
+});
+
+test("should throw error for non-string input", () => {
+  expect(() => getCardValue(10)).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
-
+  

Sprint-3/1-implement-and-rewrite-tests/testing-guide.md

@@ -7,10 +7,11 @@ Input  ──▶  Function  ──▶  Output
 ```
 
 A function
+
 - Takes **input** (via **arguments**)
 - Does some work
 - Produces **one output** (via a **return value**)
- 
+
 Example:
 
 ```
@@ -19,17 +20,18 @@ sum(2, 3) → 5
 
 Important idea: the same input should produce the same output.
 
-
 ## 2. Testing Means Predicting
 
-Testing means: 
-> If I give this input, what output should I get?
+Testing means:
 
+> If I give this input, what output should I get?
 
 ## 3. Choosing Good Test Values
 
 ### Step 1: Determining the space of possible inputs
+
 Ask:
+
 - What type of value is expected?
 - What values make sense?
   - If they are numbers:
@@ -39,7 +41,7 @@ Ask:
     - What are their length and patterns?
 - What values would not make sense?
 
-### Step 2: Choosing Good Test Values 
+### Step 2: Choosing Good Test Values
 
 #### Normal Cases
 
@@ -48,10 +50,9 @@ These confirm that the function works in normal use.
 - What does a typical, ordinary input look like?
 - Are there multiple ordinary groups of inputs? e.g. for an age checking function, maybe there are "adults" and "children" as expected ordinary groups of inputs.
 
-
 #### Boundary Cases
 
-Test values exactly at, just inside, and just outside defined ranges. 
+Test values exactly at, just inside, and just outside defined ranges.
 These values are where logic breaks most often.
 
 #### Consider All Outcomes
@@ -64,6 +65,7 @@ Every outcome must be reached by at least one test.
 #### Crossing the Edges and Invalid Values
 
 This tests how the function behaves when assumptions are violated.
+
 - What happens when input is outside of the expected range?
 - What happens when input is not of the expected type?
 - What happens when input is not in the expected format?
@@ -73,18 +75,18 @@ This tests how the function behaves when assumptions are violated.
 ### 1. Using `console.assert()`
 
 ```javascript
-  // Report a failure only when the first argument is false
-  console.assert( sum(4, 6) === 10, "Expected 4 + 6 to equal 10" );
+// Report a failure only when the first argument is false
+console.assert(sum(4, 6) === 10, "Expected 4 + 6 to equal 10");
 ```
 
 It is simpler than using `if-else` and requires no setup.
-  
+
 ### 2. Jest Testing Framework
 
 ```javascript
   test("Should correctly return the sum of two positive numbers", () => {
     expect( sum(4, 6) ).toEqual(10);
-    ... // Can test multiple samples 
+    ... // Can test multiple samples
   });
 
 ```