Update the test cases to cover the case when multiple files with the same name are in the directory

Author: dmanners

lib/internal/Magento/Framework/File/Name.php

@@ -28,7 +28,7 @@ public function getNewFileName(string $destinationFile)
         if ($this->fileExist($destinationFile)) {
             $index = 1;
             $baseName = $fileInfo['filename'] . '.' . $fileInfo['extension'];
-            while (file_exists($fileInfo['dirname'] . '/' . $baseName)) {
+            while ($this->fileExist($fileInfo['dirname'] . '/' . $baseName)) {
                 $baseName = $fileInfo['filename'] . '_' . $index . '.' . $fileInfo['extension'];
                 $index++;
             }

lib/internal/Magento/Framework/Test/Unit/File/NameTest.php

@@ -20,6 +20,11 @@ class NameTest extends \PHPUnit\Framework\TestCase
      */
     private $nonExistingFilePath;
 
+    /**
+     * @var string
+     */
+    private $multipleExistingFilePath;
+
     /**
      * @var Name
      */
@@ -29,17 +34,26 @@ protected function setUp()
     {
         $this->name = new Name();
         $this->existingFilePath = __DIR__ . '/../_files/source.txt';
+        $this->multipleExistingFilePath = __DIR__ . '/../_files/name.txt';
         $this->nonExistingFilePath = __DIR__ . '/../_files/file.txt';
     }
 
     /**
      * @test
      */
-    public function testGetNewFileNameWhenFileExists()
+    public function testGetNewFileNameWhenOneFileExists()
     {
         $this->assertEquals('source_1.txt', $this->name->getNewFileName($this->existingFilePath));
     }
 
+    /**
+     * @test
+     */
+    public function testGetNewFileNameWhenTwoFileExists()
+    {
+        $this->assertEquals('name_2.txt', $this->name->getNewFileName($this->multipleExistingFilePath));
+    }
+
     /**
      * @test
      */