function testEscapeInteger()
{
$string1 = new SafeString(576.45);
$string2 = new SafeString('576.aa');
$string3 = new SafeString('42test');
$string4 = new SafeString(-42);
$string5 = new SafeString("42'");
$string6 = new SafeString("\"'");
$string7 = new SafeString(0xdead);
$this->assertEquals($string1->toInt(), 576);
$this->assertEquals($string2->toInt(), null);
$this->assertEquals($string3->toInt(), null);
$this->assertEquals($string4->toInt(), -42);
$this->assertEquals($string5->toInt(), null);
$this->assertEquals($string6->toInt(), null);
$this->assertEquals($string7->toInt(), 57005);
}
