Flaky error handling test

[iurisilvio]

Version

3.5.3

Reproduction link

app.circleci.com

Steps to reproduce

Test error handling async component errors fails because NODE_ENV is not defined in the test file and use last definition. It fails depending on tests ordering.

https://app.circleci.com/pipelines/github/vuejs/vue-router/545/workflows/5f905817-db7d-437a-af9f-fc7c2b1561f2/jobs/7431

What is expected?

Tests always passing.

What is actually happening?

Test failing when I add new tests. I think it changes ordering.

[iurisilvio]

#3712 fix this issue.