merge strategy in .gitattributes not working

Question

I want git to never have a conflict on this file:
test/file.txt
when merging. I tried the following in .gitattributes test/file.txt merge=theirs

Answer 1

How can I define the theirs driver to get the new copy and discard the local one when merging (after a git pull)?

As I mentioned in "How do I tell git to always select my local version for conflicted merges on a specific file?", you would need to call a script like:

git config merge.keepTheir.name "always keep their during merge"
git config merge.keepTheir.driver "keepTheir.sh %O %A %B"

With keepTheir.sh (put anywhere in your PATH)

cp -f $3 $2
exit 0

Or, as jthill suggests below in the comments, directly:

git config merge.keepTheir.driver "cp -f %B %A"