git update a branch with master code example
Example 1: git update branch from master
git checkout test-branch //Checkout the branch you want to update
git merge master //Merge all code from master to test-branch
// When your are done with test-branch you can merge all code into master branch
git checkout master // Make sure you are on master branch
git merge test-branch
Example 2: git how to update branch from master
git fetch
git rebase origin/master