[PATCH v3 10/11] iotests.py: add VM.qmp_check() helper

[Vladimir Sementsov-Ogievskiy <vsementsov@xxxxxxxxxxxxx>]

I'm tired of this pattern being everywhere. Let's add a helper.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@xxxxxxxxxxxxx>
---
 tests/qemu-iotests/iotests.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index 1b48c5b9c9..dd33970454 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -977,6 +977,10 @@ def get_block_graph(self):
     def assert_edges_list(self, edges):
         assert sorted(edges) == sorted(self.get_block_graph())
 
+    def qmp_check(self, *args, **kwargs):
+        result = self.qmp(*args, **kwargs)
+        assert result == {'return': {}}
+
     def assert_block_path(self, root, path, expected_node, graph=None):
         """
         Check whether the node under the given path in the block graph
-- 
2.31.1