added some additional test cases now is complete

Author: burhan-mustafa

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

@@ -38,4 +38,6 @@ function assertEquals(actualOutput, targetOutput) {
 assertEquals(isProperFraction(1, 2), true);
 assertEquals(isProperFraction(2, 1), false);
 assertEquals(isProperFraction(-2, 1), false);
+assertEquals(isProperFraction(1, -2), true);
 assertEquals(isProperFraction(-2, -4), true);
+assertEquals(isProperFraction(-4, -2), false);