I fixed it. Now it has 20 predefined tests and 80 random tests with randomly 1 to 150 characters.

As in the reply above... Is it better? or would you suggest another wording? Thank you very much.

Sorry, I'm not a native english speaking person. I just rewrote the description. Is it better now?

Sorry, was the example code. I deleted it.

Thank you very much for your reply.
I changed the random sentence generator to avoid consecutive whitespaces.
I also added more random tests too.
The used special chars are now specified in the description.
There are no line brakes and tabs. I mentioned in the description as well.

Sorry, random tests had doubled spaces in it. so sometimes it was broken. I fixed it now.

Thank you very much. Just applied. Now everything (in the tests) is random. Does it look better to you?

Many thanks for your reply.
What do you mean by random tests? Random generated sentences? Or just some different sentences?