test-qobject-input-visitor: Use strict visitor

The qobject input visitor comes in a strict and a non-strict variant.
This test is the non-strict variant's last user.  Turns out it relies
on non-strict only in test_visitor_in_null(), and just out of
laziness.  We don't actually test the non-strict behavior.

Clean up test_visitor_in_null(), and switch to the strict variant.
The next commit will drop the non-strict variant.

Signed-off-by: Markus Armbruster <[email protected]>
Reviewed-by: Eric Blake <[email protected]>
Message-Id: <[email protected]>

tests/test-qobject-input-visitor.c

@@ -49,7 +49,7 @@ static Visitor *visitor_input_test_init_internal(TestInputVisitorData *data,
     data->obj = qobject_from_jsonv(json_string, ap);
     g_assert(data->obj);
 
-    data->qiv = qobject_input_visitor_new(data->obj, false);
+    data->qiv = qobject_input_visitor_new(data->obj, true);
     g_assert(data->qiv);
     return data->qiv;
 }
@@ -290,14 +290,14 @@ static void test_visitor_in_null(TestInputVisitorData *data,
      * when input is not null.
      */
 
-    v = visitor_input_test_init(data, "{ 'a': null, 'b': '' }");
+    v = visitor_input_test_init(data, "{ 'a': null, 'b': '', 'c': null }");
     visit_start_struct(v, NULL, NULL, 0, &error_abort);
     visit_type_null(v, "a", &error_abort);
-    visit_type_str(v, "a", &tmp, &err);
-    g_assert(!tmp);
-    error_free_or_abort(&err);
     visit_type_null(v, "b", &err);
     error_free_or_abort(&err);
+    visit_type_str(v, "c", &tmp, &err);
+    g_assert(!tmp);
+    error_free_or_abort(&err);
     visit_check_struct(v, &error_abort);
     visit_end_struct(v, NULL);
 }