test: add really basic in_gid() test

diff --git a/src/test/test-user-util.c b/src/test/test-user-util.c
index 9475b99c2803e37fa0297b8e6d6b40b00c842f6f..47baacb518a19e94410123972ff17662eb355469 100644 (file)
--- a/src/test/test-user-util.c
+++ b/src/test/test-user-util.c
@@ -286,6 +286,15 @@ static void test_make_salt(void) {
         assert(!streq(s, t));
 }
 
+static void test_in_gid(void) {
+
+        assert(in_gid(getgid()) >= 0);
+        assert(in_gid(getegid()) >= 0);
+
+        assert(in_gid(GID_INVALID) < 0);
+        assert(in_gid(TTY_GID) == 0); /* The TTY gid is for owning ttys, it would be really really weird if we were in it. */
+}
+
 int main(int argc, char *argv[]) {
         test_uid_to_name_one(0, "root");
         test_uid_to_name_one(UID_NOBODY, NOBODY_USER_NAME);
@@ -320,5 +329,7 @@ int main(int argc, char *argv[]) {
 
         test_make_salt();
 
+        test_in_gid();
+
         return 0;
 }