Add three more tests to cover different situations

Author: AhmadHmedann

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

@@ -18,3 +18,14 @@ test("returns true for a negative proper fraction( absolute value of the numerat
 test("returns false when numerator equals denominator", () => {
   expect(isProperFraction(9, 9)).toEqual(false);
 });
+
+test("return false when  numerator equals denominator when both are negative",()=>{
+  expect(isProperFraction(-4,-4)).toEqual(false);
+});
+
+test("returns false for a negative proper fraction( absolute value of the denominator is less than the numerator)", () => {
+  expect(isProperFraction(-7, 4)).toEqual(false);
+});
+test("returns false when denominator is zero", () => {
+  expect(isProperFraction(3, 0)).toEqual(false);
+});