Fixed #13, test: added test for multiplicationUsingLoopWithStringInpu…

…t where input is zero, also added requirements comments

test/com/jwetherell/algorithms/mathematics/test/MathematicsTest.java

@@ -159,10 +159,20 @@ public void multiplication() {
      public void testMultiplicationUsingFFTZero(){
         long result = Integer.parseInt(Multiplication.multiplyUsingFFT("0", "0"));
         long expected = 0;
-
+        //Requirement:
+        //When multiplying two values where one or both is zero the result should be zero
         assertTrue(result == expected);
      }
 
+     @Test
+     public void testMultiplyUsingLoopsWithStringInputZero(){
+        long result = Integer.parseInt(Multiplication.multiplyUsingLoopWithStringInput("0", "0"));
+        long expected = 0;
+        //Requirement:
+        //When multiplying two values where one or both is zero the result should be zero
+        assertTrue(result ==expected);
+    }
+
     @Test
     public void division() {
         int a = nextRandomInt(MIN, MAX);