add comprehensive tests for isProperFraction function to cover positive, negative, and zero cases

Author: rahanasuleiman8-ship-it

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

@@ -2,7 +2,38 @@ 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.
 
+// Positive numbers
+test("should return true when positive numerator is less than positive denominator", () => {
+  expect(isProperFraction(1, 2)).toEqual(true);
+  expect(isProperFraction(3, 4)).toEqual(true);
+});
+
+test("should return false when positive numerator is equal to or greater than positive denominator", () => {
+  expect(isProperFraction(3, 3)).toEqual(false);
+  expect(isProperFraction(5, 2)).toEqual(false);
+});
+
 // Special case: numerator is zero
-test(`should return false when denominator is zero`, () => {
+
+test("should return false when denominator is zero", () => {
   expect(isProperFraction(1, 0)).toEqual(false);
+  expect(isProperFraction(0, 0)).toEqual(false);
+});
+
+test("should return true when numerator is zero and denominator is non-zero", () => {
+  expect(isProperFraction(0, 5)).toEqual(true);
+  expect(isProperFraction(0, -5)).toEqual(true);
+});
+
+// Negative numbers
+test("should return true when absolute value of numerator is less than denominator", () => {
+  expect(isProperFraction(-1, 2)).toEqual(true);
+  expect(isProperFraction(1, -2)).toEqual(true);
+  expect(isProperFraction(-1, -2)).toEqual(true);
+});
+
+test("should return false when absolute value of numerator is equal to or greater than denominator", () => {
+  expect(isProperFraction(-5, 2)).toEqual(false);
+  expect(isProperFraction(5, -2)).toEqual(false);
+  expect(isProperFraction(-3, -3)).toEqual(false);
 });