diff --git a/src/Calculator/GmpCalculator.php b/src/Calculator/GmpCalculator.php
index f3e0f638..112717ed 100644
--- a/src/Calculator/GmpCalculator.php
+++ b/src/Calculator/GmpCalculator.php
@@ -86,9 +86,11 @@ public function multiply($amount, $multiplier)
             }
 
             $resultBase = gmp_strval(gmp_mul(gmp_init($amount), gmp_init($multiplierBase)));
-            if ($resultBase === '0') {
+
+            if ('0' === $resultBase) {
                 return '0';
             }
+
             $resultLength = strlen($resultBase);
             $result = substr($resultBase, 0, $resultLength - $decimalPlaces);
             $result .= '.'.substr($resultBase, $resultLength - $decimalPlaces);
diff --git a/tests/Calculator/GmpCalculatorTest.php b/tests/Calculator/GmpCalculatorTest.php
index 77617d82..71ee1f53 100644
--- a/tests/Calculator/GmpCalculatorTest.php
+++ b/tests/Calculator/GmpCalculatorTest.php
@@ -14,12 +14,18 @@ protected function getCalculator()
         return new GmpCalculator();
     }
 
-    public function testMultiplyZero()
+    /**
+     * @test
+     */
+    public function it_multiplies_zero()
     {
         $this->assertSame('0', $this->getCalculator()->multiply('0', '0.8'));
     }
 
-    public function testFloorZero()
+    /**
+     * @test
+     */
+    public function it_floors_zero()
     {
         $this->assertSame('0', $this->getCalculator()->floor('0'));
     }