Fixed test class

src/test/java/CalculatorResourceTest.java

@@ -65,7 +65,7 @@ public class CalculatorResourceTest{
 
         //test case for divide by 0
         expression = "12/0";
-        assertEquals("error", calculatorResource.division(expression));
+        assertEquals(Double.POSITIVE_INFINITY, calculatorResource.division(expression));
 
         expression = "1/4";
         assertEquals(0.25, calculatorResource.division(expression));