Style fixes

Author: adithyasrinivasan

tests/AbstractTestCase.php

@@ -6,7 +6,7 @@
 
 abstract class AbstractTestCase extends TestCase
 {
-    protected function tearDown() : void
+    protected function tearDown(): void
     {
         parent::tearDown();
 

tests/ElasticEngineTest.php

@@ -20,7 +20,7 @@ class ElasticEngineTest extends AbstractTestCase
      */
     private $engine;
 
-    protected function setUp() : void
+    protected function setUp(): void
     {
         $this->engine = $this
             ->getMockBuilder(ElasticEngine::class)

tests/Indexers/AbstractIndexerTest.php

@@ -15,7 +15,7 @@ abstract class AbstractIndexerTest extends AbstractTestCase
      */
     protected $models;
 
-    protected function setUp() : void
+    protected function setUp(): void
     {
         $this->models = new Collection([
             $this->mockModel([