Remove separate test namespace

Author: kelunik

composer.json

@@ -32,7 +32,7 @@
     },
     "autoload-dev": {
         "psr-4": {
-            "Amp\\PHPUnit\\Test\\": "test"
+            "Amp\\PHPUnit\\": "test"
         }
     }
 }

test/AsyncTestCaseTest.php

@@ -1,12 +1,9 @@
 <?php declare(strict_types=1);
 
-namespace Amp\PHPUnit\Test;
+namespace Amp\PHPUnit;
 
 use Amp\DeferredFuture;
 use Amp\Future;
-use Amp\PHPUnit\AsyncTestCase;
-use Amp\PHPUnit\TestException;
-use Amp\PHPUnit\UnhandledException;
 use PHPUnit\Framework\AssertionFailedError;
 use Revolt\EventLoop;
 use function Amp\async;

test/InvalidAsyncTestCaseTest.php

@@ -1,8 +1,7 @@
 <?php declare(strict_types=1);
 
-namespace Amp\PHPUnit\Test;
+namespace Amp\PHPUnit;
 
-use Amp\PHPUnit\AsyncTestCase;
 use PHPUnit\Framework\AssertionFailedError;
 
 class InvalidAsyncTestCaseTest extends AsyncTestCase