Command::Complete should set results instead of progress

Change-Id: I81bc8124ebf41a62b69df58032f38c825a03b817
diff --git a/buffet/dbus_command_proxy_unittest.cc b/buffet/dbus_command_proxy_unittest.cc
index 5988d98..06a393e 100644
--- a/buffet/dbus_command_proxy_unittest.cc
+++ b/buffet/dbus_command_proxy_unittest.cc
@@ -78,7 +78,7 @@
     EXPECT_CALL(*command_, MockGetProgress())
         .WillRepeatedly(ReturnRefOfCopy<std::string>("{}"));
     EXPECT_CALL(*command_, MockGetResults())
-        .WillOnce(ReturnRefOfCopy<std::string>("{}"));
+        .WillRepeatedly(ReturnRefOfCopy<std::string>("{}"));
 
     // Set up a mock ExportedObject to be used with the DBus command proxy.
     std::string cmd_path = buffet::dbus_constants::kCommandServicePathPrefix;