2-is-proper-fraction jest test: numbering cases in comment for easy count

Author: AlanGit-debug2604

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

@@ -85,7 +85,7 @@ test('should return false for improper fraction with both negative numerator and
   expect(isProperFraction(-10, -5)).toEqual(false);
 });
 
-
+// Case15: proper fraction with positive numerator and denominator
 test('should return true for proper fraction', () => {
   expect(isProperFraction(1, 2)).toEqual(true);
   expect(isProperFraction(2, 3)).toEqual(true);