[GSoC][PATCH] t7603: replace test -f by test_path_is_file

[Lucas Oshiro <lucasseikioshiro@gmail.com>]

`test_path_is_file` provides a better output when asserting whether a
file exists. Replace the occurrences of `test -f` in 7603 by it,
facilitating the trace of possible test fails.

Signed-off-by: Lucas Oshiro <lucasseikioshiro@gmail.com>
---
 t/t7603-merge-reduce-heads.sh | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/t/t7603-merge-reduce-heads.sh b/t/t7603-merge-reduce-heads.sh
index 4887ca705b..1f8c3b7ccb 100755
--- a/t/t7603-merge-reduce-heads.sh
+++ b/t/t7603-merge-reduce-heads.sh
@@ -52,12 +52,12 @@ test_expect_success 'merge c1 with c2, c3, c4, c5' '
 	test "$(git rev-parse c3)" = "$(git rev-parse HEAD^3)" &&
 	test "$(git rev-parse c5)" = "$(git rev-parse HEAD^4)" &&
 	git diff --exit-code &&
-	test -f c0.c &&
-	test -f c1.c &&
-	test -f c2.c &&
-	test -f c3.c &&
-	test -f c4.c &&
-	test -f c5.c &&
+	test_path_is_file c0.c &&
+	test_path_is_file c1.c &&
+	test_path_is_file c2.c &&
+	test_path_is_file c3.c &&
+	test_path_is_file c4.c &&
+	test_path_is_file c5.c &&
 	git show --format=%s -s >actual &&
 	! grep c1 actual &&
 	grep c2 actual &&
@@ -75,12 +75,12 @@ test_expect_success 'pull c2, c3, c4, c5 into c1' '
 	test "$(git rev-parse c3)" = "$(git rev-parse HEAD^3)" &&
 	test "$(git rev-parse c5)" = "$(git rev-parse HEAD^4)" &&
 	git diff --exit-code &&
-	test -f c0.c &&
-	test -f c1.c &&
-	test -f c2.c &&
-	test -f c3.c &&
-	test -f c4.c &&
-	test -f c5.c &&
+	test_path_is_file c0.c &&
+	test_path_is_file c1.c &&
+	test_path_is_file c2.c &&
+	test_path_is_file c3.c &&
+	test_path_is_file c4.c &&
+	test_path_is_file c5.c &&
 	git show --format=%s -s >actual &&
 	! grep c1 actual &&
 	grep c2 actual &&
-- 
2.47.1