Added test cases with decimal

Author: wankoak

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

@@ -19,4 +19,13 @@ test("should return true for negative fraction", () => {
 // Case 4: Identify Equal Numerator and Denominator:
 test("should return false for Equal Numerator fraction", () => {
   expect(isProperFraction(3, 3)).toEqual(false);
-});
+});
+
+// Improper fractions as decimals
+test('1.5 should not be proper (3/2)', () => {
+  expect(isProperFraction(1.5)).toBe(false);
+});
+
+test('2.25 should not be proper (9/4)', () => {
+  expect(isProperFraction(2.25)).toBe(false);
+});