test: fix broken tests by extending laravel base test case instead of phpunit base test case

Author: streamtw

tests/LfmUploadValidatorTest.php

@@ -1,7 +1,7 @@
 <?php
 
 use Mockery as m;
-use PHPUnit\Framework\TestCase;
+use Illuminate\Foundation\Testing\TestCase;
 use Symfony\Component\HttpFoundation\File\UploadedFile;
 use UniSharp\LaravelFilemanager\Exceptions\DuplicateFileNameException;
 use UniSharp\LaravelFilemanager\Exceptions\EmptyFileException;
@@ -13,11 +13,6 @@
 use UniSharp\LaravelFilemanager\LfmPath;
 use UniSharp\LaravelFilemanager\LfmUploadValidator;
 
-function trans()
-{
-    // leave empty
-}
-
 class LfmUploadValidatorTest extends TestCase
 {
     public function testPassesSizeLowerThanIniMaximum()