t7601: use "test_path_is_file" etc. instead of "test -f"

Some tests in t7601 use "test -f" and "test ! -f" to see if a path
exists or is missing.

Use test_path_is_file and test_path_is_missing helper functions to
clarify these tests a bit better. This especially matters for the
"missing" case because "test ! -f F" will be happy if "F" exists as a
directory, but the intent of the test is that "F" should not exist, even
as a directory. The updated code expresses this better.

Signed-off-by: Dorcas AnonoLitunya <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: dorcaslitunya

t/t7601-merge-pull-config.sh

@@ -349,13 +349,13 @@ test_expect_success 'Cannot rebase with multiple heads' '
 
 test_expect_success 'merge c1 with c2' '
 	git reset --hard c1 &&
-	test -f c0.c &&
-	test -f c1.c &&
-	test ! -f c2.c &&
-	test ! -f c3.c &&
+	test_path_is_file c0.c &&
+	test_path_is_file c1.c &&
+	test_path_is_missing c2.c &&
+	test_path_is_missing c3.c &&
 	git merge c2 &&
-	test -f c1.c &&
-	test -f c2.c
+	test_path_is_file c1.c &&
+	test_path_is_file c2.c
 '
 
 test_expect_success 'fast-forward pull succeeds with "true" in pull.ff' '
@@ -411,8 +411,8 @@ test_expect_success 'merge c1 with c2 (ours in pull.twohead)' '
 	git reset --hard c1 &&
 	git config pull.twohead ours &&
 	git merge c2 &&
-	test -f c1.c &&
-	! test -f c2.c
+	test_path_is_file c1.c &&
+	test_path_is_missing c2.c
 '
 
 test_expect_success 'merge c1 with c2 and c3 (recursive in pull.octopus)' '
@@ -431,10 +431,10 @@ test_expect_success 'merge c1 with c2 and c3 (recursive and octopus in pull.octo
 	test "$(git rev-parse c2)" = "$(git rev-parse HEAD^2)" &&
 	test "$(git rev-parse c3)" = "$(git rev-parse HEAD^3)" &&
 	git diff --exit-code &&
-	test -f c0.c &&
-	test -f c1.c &&
-	test -f c2.c &&
-	test -f c3.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
 '
 
 conflict_count()