public function testByteSubstr()
{
$example = 'sfbfs%f472bss7842hdw7';
$result = UString::byteSubstr($example);
$this->assertEquals(21, mb_strlen($result));
$this->assertEquals($example, $result);
$result = UString::byteSubstr($example, 2);
$this->assertEquals(19, mb_strlen($result));
$expected = 'bfs%f472bss7842hdw7';
$this->assertEquals($expected, $result);
$result = UString::byteSubstr($example, 0, 5);
$this->assertEquals(5, mb_strlen($result));
$expected = 'sfbfs';
$this->assertEquals($expected, $result);
$result = UString::byteSubstr($example, 4, 12);
$this->assertEquals(12, mb_strlen($result));
$expected = 's%f472bss784';
$this->assertEquals($expected, $result);
}
