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1. It turns out that `device_id` is not defined in unit test environment which makes the `assert(self.kosync_device_id)` fail and somehow makes `luajit` segmentation fault. 2. In the device spec, stubbing `io.open` will make subsquent `require` all return boolean value and segmentation fault `luajit`. This patch is a minimum viable change that makes CI work on both my local box and Travis.