Pulling Someone Else's Branch to Test their Pull Request

Add their repo as a remote:

git remote add other <their repo>

Fetch their stuff:

git fetch other

Make a temporary branch to test their stuff.

git checkout -b temp

Pull their branch that you want to test:

git pull other 123-their-branch-name

npm install
npm start

Clean up:

git checkout master
git branch -d temp
git remote rm other

Guide by Zain Azimullah