test -e does not provide a nice error message when we hit test failures,
so use test_path_exists() instead.

Further, verify that if the path exists, then the path is a file using
test_path_is_file() helper function.

Thanks,
Mahendra

Mahendra Dani (1):
  t1403: verify that path exists and is a file

 t/t1403-show-ref.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Range-diff against v1:
1:  42dd686abe = 1:  42dd686abe t1403: verify that path exists and is a file
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2.39.2 (Apple Git-143)