How to allow build to continue running, even if one of the test_script stmt is failing?

Appveyor.yml has following code :

test_script:
- npm run project1 
- npm run project2
- npm run project3

current issue is if project1 is failing full build will fail and it will not continue executing project2 and project3, But I want build to continue evenif project1 fails and want to see the status for other 2 as well, if project2 fails it should not stop it should continue till project3 and after that the build process should stop with the failed result.

any advice on this?