/**
  * Test deleting a nonexistent file.
  *
  * @since 0.1.0
  */
 public function test_delete_nonexistent_file()
 {
     $this->assertFalse($this->mock->delete('/test.txt'));
     $this->assertFalse($this->mock->exists('/test.txt'));
 }
 /**
  * @since 0.1.0
  */
 public function exists($file)
 {
     return self::$mock->exists($file);
 }