public function testEachLine()
{
$text = new Text("This is line1\n" . "This is line2\r\n" . "This is line3");
$text->eachLine(function (Text $line, $index) {
return $line->prepend($index + 1 . ': ');
});
$expected = "1: This is line1\n" . "2: This is line2\r\n" . "3: This is line3";
$this->assertEquals($expected, (string) $text);
}