adding 9 stretch tests in proper fraction

Author: TzeMingHo

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

@@ -75,24 +75,52 @@ assertEquals(negativeDenominator, true);
 // Explanation: The fraction 0/5 is a proper fraction because the absolute value of numerator (0) is less than the denominator (5).
 const zeroNumerator = isProperFraction(0, 5);
 assertEquals(zeroNumerator, true);
+
 // Stretch 3: zero denominator - this is mathematically undefined but we can decide how we want to handle it
+// Input: numerator = 5, denominator = 0
+// target output: false
+// Explanation: The fraction 5/0 is undefined in mathematics. In this implementation, we choose to return false.
 const zeroDenominator = isProperFraction(5, 0);
 assertEquals(zeroDenominator, false);
+
 // Stretch 4: both zero
+// Input: numerator = 0, denominator = 0
+// target output: false
+// Explanation: The fraction 0/0 is indeterminate in mathematics. In this implementation, we choose to return false.
 const bothZero = isProperFraction(0, 0);
 assertEquals(bothZero, false);
+
 // Stretch 5: negative numerator and denominator
+// Input: numerator = -3, denominator = -5
+// target output: true
+// Explanation: The fraction -3/-5 is a proper fraction because the absolute value of the numerator (3) is less than the absolute value of the denominator (5). The function should return true.
 const negativeNumeratorAndDenominator = isProperFraction(-3, -5);
 assertEquals(negativeNumeratorAndDenominator, true);
+
 // Stretch 6: improper negative numerator and denominator
+// Input: numerator = -3, denominator = -2
+// target output: false
+// Explanation: The fraction -3/-2 is an improper fraction because the absolute value of the numerator (3) is greater than the absolute value of the denominator (2). The function should return false.
 const properNegativeNumeratorAndDenominator = isProperFraction(-3, -2);
 assertEquals(properNegativeNumeratorAndDenominator, false);
+
 // Stretch 7: decimal values
+// Input: numerator = 2.5, denominator = 3.5
+// target output: true
+// Explanation: The fraction 2.5/3.5 is a proper fraction because the absolute value of the numerator (2.5) is less than the absolute value of the denominator (3.5). The function should return true.
 const decimalValues = isProperFraction(2.5, 3.5);
 assertEquals(decimalValues, true);
+
 // Stretch 8: improper decimal values
+// Input: numerator = 3.5, denominator = 2.5
+// target output: false
+// Explanation: The fraction 3.5/2.5 is an improper fraction because the absolute value of the numerator (3.5) is greater than the absolute value of the denominator (2.5). The function should return false.
 const improperDecimalValues = isProperFraction(3.5, 2.5);
 assertEquals(improperDecimalValues, false);
+
 // Stretch 9: invalid inputs (non-numeric values)
+// Input: numerator = "a", denominator = 2
+// target output: false
+// Explanation: The function should handle non-numeric inputs gracefully. In this case, we choose to return false.
 const invalidInputs = isProperFraction("a", 2);
 assertEquals(invalidInputs, false);

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

@@ -22,6 +22,50 @@ test("should return false when numerator equals denominator", () => {
 });
 
 // Stretch 1: Identify Negative Denominator:
-test("should return true when the absolute value of a negative denominator is larger than numerator", () => {
+test("should return true when 2 < |3|", () => {
   expect(isProperFraction(2, -3)).toEqual(true);
 });
+
+// Stretch 2: Identify Zero Numerator:
+test("should return true when 0 < 5", () => {
+  expect(isProperFraction(0, 5)).toEqual(true);
+});
+
+// Stretch 3: Handle Zero Denominator:
+// This test checks how the function handles a zero denominator, which is mathematically undefined.
+// We expect the function to return false in this case.
+test("should return false when 3 > 0", () => {
+  expect(isProperFraction(3, 0)).toEqual(false);
+});
+
+// Stretch 4: Handle Both Numerator and Denominator as Zero:
+// This test checks how the function handles both numerator and denominator being zero.
+// We expect the function to return false in this case as well.
+test("should return false when both numerator and denominator are zero", () => {
+  expect(isProperFraction(0, 0)).toEqual(false);
+});
+
+// Stretch 5: Identify Negative Numerator and Negative Denominator:
+test("should return true when |3| < |5|", () => {
+  expect(isProperFraction(-3, -5)).toEqual(true);
+});
+
+// Stretch 6: Identify Improper Negative Numerator and Negative Denominator:
+test("should return false when |3| > |2|", () => {
+  expect(isProperFraction(-3, -2)).toEqual(false);
+});
+
+// Stretch 7: Identify Decimal Values:
+test("should return true when 2.5 < 3.5", () => {
+  expect(isProperFraction(2.5, 3.5)).toEqual(true);
+});
+
+// Stretch 8: Identify Improper Decimal Values:
+test("should return false when 3.5 > 2.5", () => {
+  expect(isProperFraction(3.5, 2.5)).toEqual(false);
+});
+
+// Stretch 9: Identify invalid Inputs (Non-numeric Values):
+test("should return false for non-numeric inputs", () => {
+  expect(isProperFraction("a", 2)).toEqual(false);
+});