[PATCHv3 3/5] t7406: prefer test_* helper functions to test -[feds]

[Elijah Newren <newren@gmail.com>]

test -e, test -s, etc. do not provide nice error messages when we hit
test failures, so use the test_* helper functions from
test-lib-functions.sh.

Note: The use of 'test_path_is_file submodule/.git' may look odd, but
it is a file which is populated with a
   gitdir: ../.git/modules/submodule
directive.  If, in the future, handling of the submodule is changed and
submodule/.git becomes a directory we can change this to
test_path_is_dir (or perhaps write a test_path_exists helper function
that doesn't care whether the path is a file or a directory).

Signed-off-by: Elijah Newren <newren@gmail.com>
---
 t/t7406-submodule-update.sh | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/t/t7406-submodule-update.sh b/t/t7406-submodule-update.sh
index c6b7b59350..ab67e373c5 100755
--- a/t/t7406-submodule-update.sh
+++ b/t/t7406-submodule-update.sh
@@ -174,7 +174,7 @@ test_expect_success 'submodule update does not fetch already present commits' '
 	  git submodule update > ../actual 2> ../actual.err
 	) &&
 	test_i18ncmp expected actual &&
-	! test -s actual.err
+	test_must_be_empty actual.err
 '
 
 test_expect_success 'submodule update should fail due to local changes' '
@@ -619,8 +619,8 @@ test_expect_success 'submodule update --init skips submodule with update=none' '
 	git clone super cloned &&
 	(cd cloned &&
 	 git submodule update --init &&
-	 test -e submodule/.git &&
-	 test_must_fail test -e none/.git
+	 test_path_is_file submodule/.git &&
+	 test_path_is_missing none/.git
 	)
 '
 
-- 
2.18.0.550.geb414df874.dirty