`Cannot read property 'runtime' of undefined` in unit tests

[VladZen]

I have a problem in my unit tests only:

TypeError: Cannot read property 'runtime' of undefined
at ModuleCollection.unregister (node_modules/vuex/dist/vuex.common.js:219:28)
      at Store.unregisterModule (node_modules/vuex/dist/vuex.common.js:512:17)
      at Object.<anonymous>.module.exports (node_modules/vue-tables-2/compiled/state/register-module.js:19:17)
      at Object.<anonymous>.module.exports (node_modules/vue-tables-2/compiled/mixins/created.js:9:5)
      at VueComponent.created (node_modules/vue-tables-2/compiled/v-server-table.js:65:7)

After some research I figured out that users are stuck with the same problem using SSR. For example, vuejs/vue2-ssr-docs#137 (comment) . Diving deeper I discovered that It also can be rooted from the dynamic registration of the vuex module inside created hook instead of beforeCreate

Possible solutions:

1. vue-tables-2/lib/state/register-module.js

   Line 12 in 46e4da0

   if (self.$store && self.$store.state && self.$store.state[self.name]) {

   
   I suppose it could be better to check out the existence of the registered module using https://vuex.vuejs.org/api/#hasmodule

2. Move the registration of the module inside beforeCreate instead of created

These all things are just assumptions. I will try to test them and let you know if I come up with something.

[VladZen]

I was wrong and my error rooted from another reason. But still this can be changed to https://vuex.vuejs.org/api/#hasmodule . This functionality has been implemented recently in
vuejs/vuex#834

If someone is interested: I defined a property in the state mock, which name was the same as registered component. But I found out, that changing condition of unregistering of the module to self.$store && self.$store.hasModule(self.name) did the trick and prevented Store.unregisterModule from being called with the name of a nonexistent module.

This fact says, that self.$store.hasModule API has more stable logic because it relies on isRegistered property.