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Add unit tests for the new used-to-be-signed check as introduced in [1]:
Results before applying [1]:
$ ./test-suite used-to-be-signed.c
TEST used-to-be-signed (used-to-be-signed.c)
error: actual error text does not match expected error text.
error: see used-to-be-signed.c.error.* for further investigation.
--- used-to-be-signed.c.error.expected 2025-09-23 00:50:07.079654644 +0900
+++ used-to-be-signed.c.error.got 2025-09-23 00:50:07.073654719 +0900
@@ -1,8 +0,0 @@
-used-to-be-signed.c:8:19: warning: unsigned value that used to be signed checked against zero?
-used-to-be-signed.c:6:33: signed value source
-used-to-be-signed.c:11:17: warning: unsigned value that used to be signed checked against zero?
-used-to-be-signed.c:6:33: signed value source
-used-to-be-signed.c:14:20: warning: unsigned value that used to be signed checked against zero?
-used-to-be-signed.c:6:33: signed value source
-used-to-be-signed.c:17:18: warning: unsigned value that used to be signed checked against zero?
-used-to-be-signed.c:6:33: signed value source
error: FAIL: test 'used-to-be-signed.c' failed
KO: out of 1 tests, 0 passed, 1 failed
...and after:
$ ./test-suite used-to-be-signed.c
TEST used-to-be-signed (used-to-be-signed.c)
OK: out of 1 tests, 1 passed, 0 failed
[1] Warn about "unsigned value that used to be signed against zero"
Link: https://lore.kernel.org/linux-sparse/20250921061337.3047616-1-mailhol@kernel.org/
Signed-off-by: Vincent Mailhol <mailhol@kernel.org>
Signed-off-by: Chris Li <sparse@chrisli.org>
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