Minor test fixes

Author: castarco

tests/Decimal/DecimalCreateTest.php

@@ -16,15 +16,15 @@ public function testCreateWithInvalidType()
     {
         $thrown = false;
         try {
-            $d = Decimal::create(array(25, 67));
+            Decimal::create(array(25, 67));
         } catch (InvalidArgumentTypeException $e) {
             $thrown = true;
         }
         $this->assertTrue($thrown);
 
         $thrown = false;
         try {
-            $d = Decimal::create(new A());
+            Decimal::create(new A());
         } catch (InvalidArgumentTypeException $e) {
             $thrown = true;
         }

tests/Decimal/DecimalFromFloatTest.php

@@ -24,7 +24,7 @@ public function testNaN()
     {
         $catched = false;
         try {
-            $NaN = Decimal::fromFloat(INF - INF);
+            Decimal::fromFloat(INF - INF);
         } catch (\DomainException $e) {
             $catched = true;
         }