t1300: use test helpers instead of `test` command

Replace `test -f` and `test -h` checks with `test_path_is_file` and
`test_path_is_symlink`. Using the test framework helpers provides
clearer diagnostics and keeps tests consistent across the suite.

Signed-off-by: Pushkar Singh <pushkarkumarsingh1970@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t1300-config.sh

diff --git a/t/t1300-config.sh b/t/t1300-config.sh
index 358d636..9850fcd 100755
--- a/t/t1300-config.sh
+++ b/t/t1300-config.sh
@@ -1232,12 +1232,12 @@
 	test_when_finished "rm myconfig" &&
 	ln -s notyet myconfig &&
 	git config --file=myconfig test.frotz nitfol &&
-	test -h myconfig &&
-	test -f notyet &&
+	test_path_is_symlink myconfig &&
+	test_path_is_file notyet &&
 	test "z$(git config --file=notyet test.frotz)" = znitfol &&
 	git config --file=myconfig test.xyzzy rezrov &&
-	test -h myconfig &&
-	test -f notyet &&
+	test_path_is_symlink myconfig &&
+	test_path_is_file notyet &&
 	cat >expect <<-\EOF &&
 	nitfol
 	rezrov

t/t2021-checkout-overwrite.sh

diff --git a/t/t2021-checkout-overwrite.sh b/t/t2021-checkout-overwrite.sh
index a5c03d5..38c41ae 100755
--- a/t/t2021-checkout-overwrite.sh
+++ b/t/t2021-checkout-overwrite.sh
@@ -27,7 +27,7 @@
 	git rm --cached a/b &&
 	git commit -m "un-track the file" &&
 	test_must_fail git checkout start &&
-	test -f a/b
+	test_path_is_file a/b
 '
 
 test_expect_success 'create a commit where dir a/b changed to symlink' '
@@ -49,7 +49,7 @@
 
 test_expect_success SYMLINKS 'the symlink remained' '
 
-	test -h a/b
+	test_path_is_symlink a/b
 '
 
 test_expect_success 'cleanup after previous symlink tests' '