How to run gitlab runner full localy?

I want to test some gitlab runner features related to my project, but I cant without committing and pushing changes to a repository. Every time after firing a gitlab runner command gitlab-runner exec shell test70 the runner is fetching a repository into builds/0/project-1 folder. Even if I made some changes to a project files into the folder, the runner is checking out the changes.

So how to run the gitlab-runner full offline?