S:If test with percent car

[Craftyman]

Hi,

I would like to check if my unit equal to percent cahr (%) to replace it by
%25 in my url in order to allow to get this value during the auto decoding
url by my browser.
In use the folling code :

<s:if test="%{unit} == '%'>
 // Special code here to replace % by %2( in my url
</s:if>

But it does not run; percent char is not check correctly

I have try other kind of syntaxe witout more success.

Any idea ?

Regards

Cédric