public function testAppendAddsDataToFile()
{
file_put_contents(__DIR__ . '/file.txt', 'foo');
$files = new Filesystem();
$bytesWritten = $files->append(__DIR__ . '/file.txt', 'bar');
$this->assertEquals(mb_strlen('bar', '8bit'), $bytesWritten);
$this->assertFileExists(__DIR__ . '/file.txt');
$this->assertStringEqualsFile(__DIR__ . '/file.txt', 'foobar');
@unlink(__DIR__ . '/file.txt');
}
