Add strict types declaration and minor formatting adjustments in tests

Author: Thavarshan

src/functions.php

@@ -12,6 +12,7 @@
 function getLoop(): object
 {
     static $loop = null;
+
     if ($loop === null) {
         $loop = Loop::get();
     }

tests/AsyncAwaitTest.php

@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 it('supports chaining then and catch syntax', function () {
     $func = async(fn () => 'Success');
 
@@ -25,7 +27,7 @@ function (mixed $value) use (&$result) {
 
         expect($result)->toBe('Success');
     } catch (\Throwable $th) {
-        $this->fail('Await threw an unexpected exception: '.$th->getMessage());
+        $this->fail('Await threw an unexpected exception: ' . $th->getMessage());
     }
 });