Write tests in Jest syntax to cover all combinations for isProperFraction function

Author: djebsoft

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

@@ -4,7 +4,29 @@ 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.
 
-// Special case: numerator is zero
+// Special case: denominator is zero (undefined)
 test(`should return false when denominator is zero`, () => {
   expect(isProperFraction(1, 0)).toEqual(false);
 });
+
+// Special case: numerator is zero (proper fraction)
+test(`should return true when numerator is zero`, () => {
+  expect(isProperFraction(0, 1)).toEqual(true);
+});
+
+// Special case: both numerator and denominator are zeros (undefined)
+test(`should return false when both numerator and denominator are zero`, () => {
+  expect(isProperFraction(0, 0)).toEqual(false);
+});
+
+// case: the absolute value of the numerater is less than the absolute value of the denominater (proper fraction)
+test(`should return true for positive proper fraction`, () => {
+  expect(isProperFraction(1, 2)).toEqual(true);
+});
+
+// case: the absolute value of the denominater is less than the absolute value of the numerater (improper fraction)
+test(`should return false for positive improper fraction`, () => {
+  expect(isProperFraction(2, 1)).toEqual(false);
+});
+
+// no need to test the cases where the denominator or numerator or both are negative as I used their absolute value in the function.