Add Jest tests for isproperfraction function

Author: khalidbih

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

@@ -7,7 +7,14 @@ test("should return true for a proper fraction", () => {
 });
 
 // Case 2: Identify Improper Fractions:
-
+test("should return false when numerator is greater than denominator", () => {
+  expect(isProperFraction(5, 2)).toEqual(false);
+});
 // Case 3: Identify Negative Fractions:
-
+test("should return true when absolute numerator is less than absolute denominator", () => {
+  expect(isProperFraction(-4, 7)).toEqual(true);
+});
 // Case 4: Identify Equal Numerator and Denominator:
+test("should return false when numerator equals denominator", () => {
+  expect(isProperFraction(3, 3)).toEqual(false);
+});