test the isproperfraction function with various numerator and denominator combinations

Author: gaireprakash20-ops

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

@@ -1,8 +1,52 @@
 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.
+// Special case: numerator is zero (0/1 = 0, which is a proper fraction)
+test(`should return true when numerator is zero`, () => {
+  expect(isProperFraction(0, 1)).toEqual(true);
+});
 
-// Special case: numerator is zero
+// Special case: denominator is zero (not a valid fraction)
 test(`should return false when denominator is zero`, () => {
   expect(isProperFraction(1, 0)).toEqual(false);
 });
+
+// Both positive
+test(`should return false when numerator is greater than denominator`, () => {
+  expect(isProperFraction(7, 5)).toEqual(false);
+});
+test(`should return true when numerator is smaller than denominator`, () => {
+  expect(isProperFraction(1, 3)).toEqual(true);
+});
+test(`should return false when numerator equals denominator`, () => {
+  expect(isProperFraction(2, 2)).toEqual(false);
+});
+
+// Both negative
+test(`should return false when both negative and |numerator| is greater`, () => {
+  expect(isProperFraction(-7, -5)).toEqual(false); // was true
+});
+test(`should return true when both negative and |numerator| is smaller`, () => {
+  expect(isProperFraction(-5, -7)).toEqual(true); // was false
+});
+test(`should return false when both negative and |numerator| is slightly greater`, () => {
+  expect(isProperFraction(-10, -9)).toEqual(false); // was true
+});
+test(`should return false when both negative and equal`, () => {
+  expect(isProperFraction(-5, -5)).toEqual(false);
+});
+
+// Positive numerator, negative denominator
+test(`should return false when numerator is positive, denominator negative, |numerator| greater`, () => {
+  expect(isProperFraction(7, -5)).toEqual(false);
+});
+test(`should return false when numerator is positive, denominator negative, equal absolute values`, () => {
+  expect(isProperFraction(7, -7)).toEqual(false);
+});
+
+// Negative numerator, positive denominator
+test(`should return false when numerator is negative, denominator positive, |numerator| greater`, () => {
+  expect(isProperFraction(-7, 5)).toEqual(false); // was true
+});
+test(`should return false when numerator is negative, denominator positive, equal absolute values`, () => {
+  expect(isProperFraction(-7, 7)).toEqual(false);
+});