t7700: s/test -f/test_path_is_file/

Since we have debugging-friendly alternatives to `test -f`, replace
instances of `test -f` with `test_path_is_file` so that if a command
ever fails, we get better debugging information.

Signed-off-by: Denton Liu <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: Denton-L

t/t7700-repack.sh

@@ -106,7 +106,7 @@ test_expect_success 'packed obs in alt ODB are repacked even when local repo is
 	mv .git/objects/pack/* alt_objects/pack &&
 	git repack -a &&
 	myidx=$(ls -1 .git/objects/pack/*.idx) &&
-	test -f "$myidx" &&
+	test_path_is_file "$myidx" &&
 	for p in alt_objects/pack/*.idx
 	do
 		git verify-pack -v $p | sed -n -e "/^[0-9a-f]\{40\}/p"
@@ -129,7 +129,7 @@ test_expect_success 'packed obs in alt ODB are repacked when local repo has pack
 	git repack &&
 	git repack -a -d &&
 	myidx=$(ls -1 .git/objects/pack/*.idx) &&
-	test -f "$myidx" &&
+	test_path_is_file "$myidx" &&
 	for p in alt_objects/pack/*.idx
 	do
 		git verify-pack -v $p | sed -n -e "/^[0-9a-f]\{40\}/p"
@@ -148,7 +148,7 @@ test_expect_success 'packed obs in alternate ODB kept pack are repacked' '
 	for p in alt_objects/pack/*.pack
 	do
 		base_name=$(basename $p .pack) &&
-		if test -f alt_objects/pack/$base_name.keep
+		if test_path_is_file alt_objects/pack/$base_name.keep
 		then
 			rm alt_objects/pack/$base_name.keep
 		else
@@ -157,7 +157,7 @@ test_expect_success 'packed obs in alternate ODB kept pack are repacked' '
 	done &&
 	git repack -a -d &&
 	myidx=$(ls -1 .git/objects/pack/*.idx) &&
-	test -f "$myidx" &&
+	test_path_is_file "$myidx" &&
 	for p in alt_objects/pack/*.idx
 	do
 		git verify-pack -v $p | sed -n -e "/^[0-9a-f]\{40\}/p"