rewrite proper fraction test with jest(exercise 2)

Author: edinakurdi

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

@@ -2,9 +2,37 @@
 // We will use the same function, but write tests for it using Jest in this file.
 const isProperFraction = require("../implement/2-is-proper-fraction");
 
-// TODO: Write tests in Jest syntax to cover all combinations of positives, negatives, zeros, and other categories.
+// TODO: Write tests in Jest syntax to cover all combinations of positives, negatives, zeros, and other categories.]
 
-// Special case: numerator is zero
+//case 1: proper function
+
+test("should return true when |numerator| < |denominator|", () => {
+  expect(isProperFraction(-3, 4)).toEqual(true);
+  expect(isProperFraction(3, -4)).toEqual(true);
+  expect(isProperFraction(1, 2)).toEqual(true);
+});
+
+//case 2: result is a whole number
+test("should return false when the result is a whole number", () => {
+  expect(isProperFraction(2, 2)).toEqual(false);
+  expect(isProperFraction(-2 - 2)).toEqual(false);
+  expect(isProperFraction(2, -2)).toEqual(false);
+});
+
+//case 3: numerator or denominator is a decimal
+test("should return false if the numerator or denominator is a decimal", () => {
+  expect(isProperFraction(1.5, 2)).toEqual(false);
+  expect(isProperFraction(1, 1.5)).toEqual(false);
+});
+
+//case 4: numerator or denominator is negative
+test("should return true even if the numerator or denominator is negative", () => {
+  expect(isProperFraction(-4, 5)).toEqual(true);
+  expect(isProperFraction(4, -5)).toEqual(true);
+});
+
+// Special case: numerator or denominator is zero
 test(`should return false when denominator is zero`, () => {
   expect(isProperFraction(1, 0)).toEqual(false);
+  expect(isProperFraction(0, 1)).toEqual(false);
 });