Denton Liu authored Apr 20, 2020 and Junio C Hamano committed Apr 20, 2020

According to t/README, test_must_fail() should only be used to test for
failure in Git commands.

Replace the invocation of `test_must_fail test_path_is_file` with
`test_path_is_missing` since, in this test case, the path should not
exist at all.

In all the cases where `test_must_fail test_alternate_is_used` appears,
test_alternate_is_used() fails because test_line_count() cannot open the
non-existent $alternates_file. Replace
`test_must_fail test_alternate_is_used` with `test_path_is_missing` to
test for this directly.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>