block: Use JSON null instead of "" to disable backing file

[qemu.git] / tests / qemu-iotests / 030

diff --git a/tests/qemu-iotests/030 b/tests/qemu-iotests/030
index e00c11b80463b2ce1d7f06ea853d343edc230d46..feee86115dd3260c7457ecda98af09eb6f45bd73 100755 (executable)
--- a/tests/qemu-iotests/030
+++ b/tests/qemu-iotests/030
@@ -147,6 +147,10 @@ class TestSingleDrive(iotests.QMPTestCase):
         result = self.vm.qmp('block-stream', device='nonexistent')
         self.assert_qmp(result, 'error/class', 'GenericError')
 
+    def test_job_id_missing(self):
+        result = self.vm.qmp('block-stream', device='mid')
+        self.assert_qmp(result, 'error/class', 'GenericError')
+
 
 class TestParallelOps(iotests.QMPTestCase):
     num_ops = 4 # Number of parallel block-stream operations