Workflow for bisecting with test in a branch

I'd like to bisect using a test I've written in a different branch from the one I'm bisecting. But to do `git bisect run ./test.bash` I have to keep the new test file and an old test suite file the same during the whole `bisect` process. This turned out pretty cumbersome:

test.bash:

``` #!/usr/bin/env bash

set -o errexit

git show my-test-branch:test-suite-path > test-suite-path mkdir -p test-dir git show my-test-branch:test-dir/test-file > test-dir/test-file

run_test || exit_code=$? git checkout . exit "${exit_code-0}" ```

Console session:

``` git bisect start my-test-branch known-good-ancestor git bisect run ./test.bash ```

Is there a more streamlined way to achieve the same thing, that is, forcing some checked-in files to not change while bisecting?

Kind regards Victor Engmark