Update calculator_test.php

Author: Vidya Raghavan

tests/calculator_test.php

@@ -17,7 +17,7 @@ public function testAdd(){
   public function testSubtract(){
       $calc = new Calculator();
       $difference = $calc->subtract(5,2);
-      $this->assertEquals(2, $difference); //check if 5 - 2 is equal to 3
+      $this->assertEquals(3, $difference); //check if 5 - 2 is equal to 3
   }
 
   //test if the multiply() method in our calculator class
@@ -26,7 +26,7 @@ public function testSubtract(){
   public function testMultiply(){
       $calc = new Calculator();
       $product = $calc->multiply(array(1,3,5,6));
-      $this->assertEquals(91, $product); //check if 1*3*5*6 is equal to 90
+      $this->assertEquals(90, $product); //check if 1*3*5*6 is equal to 90
   }
 
   //test if the divide() method in our calculator class
@@ -35,7 +35,7 @@ public function testMultiply(){
   public function testDivide(){
       $calc = new Calculator();
       $quotient = $calc->divide(10,2);
-      $this->assertEquals(15, $quotient); //check if 10/2 is equal to 5
+      $this->assertEquals(5, $quotient); //check if 10/2 is equal to 5
   }
 }
 ?>