[PATCH v2] t7605: use test_path_is_file instead of test -f

From: Mansi <mansimaanu8627@gmail.com>

Replace old-style 'test -f' path checks with the modern test_path_is_file helper in the merge_c1_to_c2_cmds block.

The helper provides clearer failure messages and is the established convention in Git's test suite.

Signed-off-by: Mansi <mansimaanu8627@gmail.com>
---
    t7605: use test_path_is_file instead of test -f
    
    cc: Lucas Seiki Oshiro lucasseikioshiro@gmail.com

Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-2050%2FMansiSingh17%2Fgsoc-t7605-test-path-helpers-v2
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-2050/MansiSingh17/gsoc-t7605-test-path-helpers-v2
Pull-Request: https://github.com/gitgitgadget/git/pull/2050

Range-diff vs v1:

 1:  11724e9310 ! 1:  0a0c9de263 t7605: use test_path_is_file instead of test -f
     @@ Commit message
          The helper provides clearer failure messages and is the
          established convention in Git's test suite.
      
     -    These instances were found using:
     -      grep -rn "test -[efd]" t/ --include="*.sh"
     -
          Signed-off-by: Mansi <mansimaanu8627@gmail.com>
      
       ## t/t7605-merge-resolve.sh ##

 t/t7605-merge-resolve.sh | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)