tests: userspace: cover z_object_recycle()

We didn't have code coverage for this function anywhere
except indirectly through some network tests; exercise it
in the suite of userspace tests.

Signed-off-by: Andrew Boie <[email protected]>

Author: Andrew Boie

tests/kernel/mem_protect/userspace/src/main.c

@@ -1108,6 +1108,29 @@ void test_bad_syscall(void)
 
 }
 
+static struct k_sem recycle_sem;
+
+
+void test_object_recycle(void)
+{
+	struct _k_object *ko;
+	int perms_count = 0;
+
+	ko = z_object_find(&recycle_sem);
+	(void)memset(ko->perms, 0xFF, sizeof(ko->perms));
+
+	z_object_recycle(&recycle_sem);
+	zassert_true(ko != NULL, "kernel object not found");
+	zassert_true(ko->flags & K_OBJ_FLAG_INITIALIZED,
+		     "object wasn't marked as initialized");
+
+	for (int i = 0; i < CONFIG_MAX_THREAD_BYTES; i++) {
+		perms_count += popcount(ko->perms[i]);
+	}
+
+	zassert_true(perms_count == 1, "invalid number of thread permissions");
+}
+
 void test_main(void)
 {
 	struct k_mem_partition *parts[] = {&part0, &part1,
@@ -1160,7 +1183,8 @@ void test_main(void)
 			 ztest_unit_test(domain_remove_thread_context_switch),
 			 ztest_unit_test(test_stack_buffer),
 			 ztest_user_unit_test(test_unimplemented_syscall),
-			 ztest_user_unit_test(test_bad_syscall)
+			 ztest_user_unit_test(test_bad_syscall),
+			 ztest_unit_test(test_object_recycle)
 			 );
 	ztest_run_test_suite(userspace);
 }