Elgg\Filesystem\File::exists PHP Method

    public function exists()
    {
        return $this->directory->isFile($this->path);
    }

 public function testCanCheckForItsOwnExistence()
 {
     $directory = GaufretteDirectory::createInMemory();
     $directory->putContents('/foo/bar/bar.php', 'bar');
     $realfile = new File($directory, '/foo/bar/bar.php');
     $nonfile = new File($directory, '/foo/baz.php');
     $this->assertTrue($realfile->exists());
     $this->assertFalse($nonfile->exists());
 }