Add additional test and check it passes to 1-implement-and-rewrite-tests/implement/2-is-proper-fraction.js

Author: Temceo

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

@@ -36,5 +36,6 @@ assertEquals(isProperFraction(1, 2), true);
 assertEquals(isProperFraction(3, 1), false);
 assertEquals(isProperFraction(2, 2), false);
 assertEquals(isProperFraction(5, 0), false);
+assertEquals(isProperFraction(-1, 0), false);
 assertEquals(isProperFraction(-2, 4), true);
 assertEquals(isProperFraction(4, -2), false);