t7611: replace test -f with test_path_is* helpers

Replace `test -f` and `test ! -f` with `test_path_is_file` and
`test_path_is_missing` for better debuggability.

While `test -f` ensures that the file exists and is a regular file,
`test_path_is_file` provides clearer error messages on failure.

On the other hand, `test ! -f` checks either the absence of a regular
file or the presence of any other filesystem object, but looking at
them in the test individually, all of them should've said `test ! -e`,
i.e. "there shouldn't be anything at given path on filesystem."

Replace these cases with `test_path_is_missing` for better
debuggability.

Helped-by: karthik nayak <[email protected]>
Helped-by: Junio C Hamano <[email protected]>
Signed-off-by: Meet Soni <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: inosmeet

t/t7611-merge-abort.sh

@@ -54,21 +54,21 @@ test_expect_success 'fails without MERGE_HEAD (unstarted merge)' '
 '
 
 test_expect_success 'fails without MERGE_HEAD (unstarted merge): .git/MERGE_HEAD sanity' '
-	test ! -f .git/MERGE_HEAD &&
+	test_path_is_missing .git/MERGE_HEAD &&
 	test "$pre_merge_head" = "$(git rev-parse HEAD)"
 '
 
 test_expect_success 'fails without MERGE_HEAD (completed merge)' '
 	git merge clean_branch &&
-	test ! -f .git/MERGE_HEAD &&
+	test_path_is_missing .git/MERGE_HEAD &&
 	# Merge successfully completed
 	post_merge_head="$(git rev-parse HEAD)" &&
 	test_must_fail git merge --abort 2>output &&
 	test_grep MERGE_HEAD output
 '
 
 test_expect_success 'fails without MERGE_HEAD (completed merge): .git/MERGE_HEAD sanity' '
-	test ! -f .git/MERGE_HEAD &&
+	test_path_is_missing .git/MERGE_HEAD &&
 	test "$post_merge_head" = "$(git rev-parse HEAD)"
 '
 
@@ -79,10 +79,10 @@ test_expect_success 'Forget previous merge' '
 test_expect_success 'Abort after --no-commit' '
 	# Redo merge, but stop before creating merge commit
 	git merge --no-commit clean_branch &&
-	test -f .git/MERGE_HEAD &&
+	test_path_is_file .git/MERGE_HEAD &&
 	# Abort non-conflicting merge
 	git merge --abort &&
-	test ! -f .git/MERGE_HEAD &&
+	test_path_is_missing .git/MERGE_HEAD &&
 	test "$pre_merge_head" = "$(git rev-parse HEAD)" &&
 	test -z "$(git diff)" &&
 	test -z "$(git diff --staged)"
@@ -91,10 +91,10 @@ test_expect_success 'Abort after --no-commit' '
 test_expect_success 'Abort after conflicts' '
 	# Create conflicting merge
 	test_must_fail git merge conflict_branch &&
-	test -f .git/MERGE_HEAD &&
+	test_path_is_file .git/MERGE_HEAD &&
 	# Abort conflicting merge
 	git merge --abort &&
-	test ! -f .git/MERGE_HEAD &&
+	test_path_is_missing .git/MERGE_HEAD &&
 	test "$pre_merge_head" = "$(git rev-parse HEAD)" &&
 	test -z "$(git diff)" &&
 	test -z "$(git diff --staged)"
@@ -105,7 +105,7 @@ test_expect_success 'Clean merge with dirty index fails' '
 	git add foo &&
 	git diff --staged > expect &&
 	test_must_fail git merge clean_branch &&
-	test ! -f .git/MERGE_HEAD &&
+	test_path_is_missing .git/MERGE_HEAD &&
 	test "$pre_merge_head" = "$(git rev-parse HEAD)" &&
 	test -z "$(git diff)" &&
 	git diff --staged > actual &&
@@ -114,7 +114,7 @@ test_expect_success 'Clean merge with dirty index fails' '
 
 test_expect_success 'Conflicting merge with dirty index fails' '
 	test_must_fail git merge conflict_branch &&
-	test ! -f .git/MERGE_HEAD &&
+	test_path_is_missing .git/MERGE_HEAD &&
 	test "$pre_merge_head" = "$(git rev-parse HEAD)" &&
 	test -z "$(git diff)" &&
 	git diff --staged > actual &&
@@ -129,10 +129,10 @@ test_expect_success 'Reset index (but preserve worktree changes)' '
 
 test_expect_success 'Abort clean merge with non-conflicting dirty worktree' '
 	git merge --no-commit clean_branch &&
-	test -f .git/MERGE_HEAD &&
+	test_path_is_file .git/MERGE_HEAD &&
 	# Abort merge
 	git merge --abort &&
-	test ! -f .git/MERGE_HEAD &&
+	test_path_is_missing .git/MERGE_HEAD &&
 	test "$pre_merge_head" = "$(git rev-parse HEAD)" &&
 	test -z "$(git diff --staged)" &&
 	git diff > actual &&
@@ -141,10 +141,10 @@ test_expect_success 'Abort clean merge with non-conflicting dirty worktree' '
 
 test_expect_success 'Abort conflicting merge with non-conflicting dirty worktree' '
 	test_must_fail git merge conflict_branch &&
-	test -f .git/MERGE_HEAD &&
+	test_path_is_file .git/MERGE_HEAD &&
 	# Abort merge
 	git merge --abort &&
-	test ! -f .git/MERGE_HEAD &&
+	test_path_is_missing .git/MERGE_HEAD &&
 	test "$pre_merge_head" = "$(git rev-parse HEAD)" &&
 	test -z "$(git diff --staged)" &&
 	git diff > actual &&
@@ -159,7 +159,7 @@ test_expect_success 'Fail clean merge with conflicting dirty worktree' '
 	echo xyzzy >> bar &&
 	git diff > expect &&
 	test_must_fail git merge --no-commit clean_branch &&
-	test ! -f .git/MERGE_HEAD &&
+	test_path_is_missing .git/MERGE_HEAD &&
 	test "$pre_merge_head" = "$(git rev-parse HEAD)" &&
 	test -z "$(git diff --staged)" &&
 	git diff > actual &&
@@ -168,7 +168,7 @@ test_expect_success 'Fail clean merge with conflicting dirty worktree' '
 
 test_expect_success 'Fail conflicting merge with conflicting dirty worktree' '
 	test_must_fail git merge conflict_branch &&
-	test ! -f .git/MERGE_HEAD &&
+	test_path_is_missing .git/MERGE_HEAD &&
 	test "$pre_merge_head" = "$(git rev-parse HEAD)" &&
 	test -z "$(git diff --staged)" &&
 	git diff > actual &&
@@ -183,7 +183,7 @@ test_expect_success 'Fail clean merge with matching dirty worktree' '
 	echo bart > bar &&
 	git diff > expect &&
 	test_must_fail git merge --no-commit clean_branch &&
-	test ! -f .git/MERGE_HEAD &&
+	test_path_is_missing .git/MERGE_HEAD &&
 	test "$pre_merge_head" = "$(git rev-parse HEAD)" &&
 	test -z "$(git diff --staged)" &&
 	git diff > actual &&
@@ -194,7 +194,7 @@ test_expect_success 'Fail conflicting merge with matching dirty worktree' '
 	echo barf > bar &&
 	git diff > expect &&
 	test_must_fail git merge conflict_branch &&
-	test ! -f .git/MERGE_HEAD &&
+	test_path_is_missing .git/MERGE_HEAD &&
 	test "$pre_merge_head" = "$(git rev-parse HEAD)" &&
 	test -z "$(git diff --staged)" &&
 	git diff > actual &&