I have to test my grammar (written with Xtext). I've see it is possible with use of unit test, but I can't find a good tutorial about it.
Can you help me?
There are several links about this.
The official tutorials have chapter about special Xtext/Junit support: Unit Testing the Language
Xtext-Utils has some tools
Xpect provides a DSL for unittesting DSLs. Slides here (Looks interesting)
The slides of Markus Voelter "Testing DSLs" explain stuff.