vue-js-modal test code issue from 2.0.0

[mercedesbenz00]

Problem:

Cannot do unit test for vue-js-modal from 2.0.0.
Because in https://github.com/euvl/vue-js-modal/blob/master/src/PluginCore.js, show/hide function is defined as const.
So we can not mock for unit test.

I think there is no way to test in this case, maybe need to remove const for show/hide function.
Thanks.

Version:

v2.0.1

Example & screenshots:

I have checked stackoverflow for solutions and 100% sure that this issue is not not related to my code.

[stale]

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