function GenerateResult($InputText, $StartChar, $SelectionSize, $Tag)
{
    $SelectedText = TakeOnePartOfAString($InputText, $StartChar, $SelectionSize);
    $NewString = AdATagOnAString($Tag, $SelectedText);
    $WaitedText = str_replace($SelectedText, $NewString, $InputText);
    return $WaitedText;
}
 function TestLocateAPartOfInputTextOnTheFirstLine()
 {
     $SelectedPartOfTheString = TakeOnePartOfAString(TakeAllDatasInAFile(INPUT_FILE), 3, 8);
     $this->assertEqual($SelectedPartOfTheString, "lo World");
     $SelectedOtherOfTheString = TakeOnePartOfAString(TakeAllDatasInAFile(INPUT_FILE), 0, 36);
     $this->assertEqual($SelectedOtherOfTheString, "Hello World I'm Luc\r\nI live In Paris");
 }