Fix isProperFraction logic and expand test cases

Updated the isProperFraction function to handle negative values correctly and added additional test cases for comprehensive coverage.

Author: khaliun-dev

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

@@ -1,6 +1,6 @@
 
 function isProperFraction(numerator, denominator) {
-  return numerator < denominator;
+  return Math.abs(numerator) < Math.abs(denominator);
 }
 
 function assertEquals(actualOutput, targetOutput) {
@@ -13,9 +13,21 @@ assertEquals(isProperFraction(1, 2), true);
 assertEquals(isProperFraction(3, 4), true);
 assertEquals(isProperFraction(0, 5), true);
 
+assertEquals(isProperFraction(-1, 2), true);
+assertEquals(isProperFraction(1, -2), true);
+assertEquals(isProperFraction(-1, -2), true);
+
 assertEquals(isProperFraction(5, 5), false);
+assertEquals(isProperFraction(-5, -5), false);
 
 assertEquals(isProperFraction(7, 4), false);
 assertEquals(isProperFraction(10, 3), false);
 
+assertEquals(isProperFraction(-5, 2), false);
+assertEquals(isProperFraction(5, -2), false);
+assertEquals(isProperFraction(-5, -2), false);
+
+
+
+
 console.log("All tests finished");