[Bug Report] unit test has an international I18N report error.

[mgbq]

Element UI version

2.3.9

OS/Browsers version

1.9

Vue version

2.5.17-beta.0

Reproduction Link

Molunerfinn/vue-koa-demo#32

Steps to reproduce

你好，我参考了element test util.js ，我是这样引入i18n的
import i18n from '@/lang'
Vue.use(Element, {
size: 'medium', // set element-ui default size
i18n: (key, value) => i18n.t(key, value)
})

可是它报错了 信息为 ERROR LOG: TypeError: undefined is not an object (evaluating 'i18n._t')
改成
import i18n from '@/lang'
Vue.use(i18n) 也是报这个错，百忙中求解答

What is Expected?

期望正常test

What is actually happening?

ERROR LOG: TypeError: undefined is not an object (evaluating 'i18n._t')

[element-bot]

Translation of this issue:

Element UI version
2.3.9

OS/Browsers version
One point nine

Vue version
2.5.17-beta.0

Reproduction Link
Molunerfinn/vue-koa-demo#32

Steps to reproduce
Hello, I refer to element test util.js. I introduced I18N in this way.

Import I18N from'@/lang'
Vue.use (Element, {

Size:'medium', / / / set element-ui default size
I18n: (key, value) = > i18n.t (key, value)

})
However, it reported the wrong information as ERROR LOG: TypeError: undefined is not an object (evaluating'i18n._t').

Change into
Import I18N from'@/lang'

Vue.use (I18N) also reported this mistake and asked for answers in busy schedule.
What is Expected?

Expected normal test
What is actually happening?

ERROR LOG: TypeError: undefined is not an object (evaluating'i18n._t')

[mgbq]

thanks

[jikkai]

根据你给出的片段感觉是用法有问题，请仔细阅读文档 - 国际化获得帮助。如果确认不是用法问题而是可复现的 bug，请整理一个最小化可复现 demo。