Rename NVRAM to the correct application id before start the server

tests/modules/iou/test_iou_vm.py

@@ -85,6 +85,18 @@ def test_start(loop, vm, monkeypatch):
                     assert vm.is_running()
 
 
+def test_rename_nvram_file(loop, vm, monkeypatch):
+    """
+    It should rename the nvram file to the correct name before launching the VM
+    """
+
+    with open(os.path.join(vm.working_dir, "nvram_0000{}".format(vm.application_id + 1)), 'w+') as f:
+        f.write("1")
+
+    vm._rename_nvram_file()
+    assert os.path.exists(os.path.join(vm.working_dir, "nvram_0000{}".format(vm.application_id)))
+
+
 def test_stop(loop, vm):
     process = MagicMock()