Version

3.0.0-rc.10

Node and OS info

node 8, npm 6, MacOS

Steps to reproduce

1. Create an vue app with cypress e2e test supported by VueCLI
2. Run e2e test with --config option for cypress:

vue-cli-service test:e2e --config video=false,viewportWidth=1280,viewportHeight=720

What is expected?

Cypress run correctly with config option setting

What is actually happening?

All the test cases failed with an error from cypress:

ERROR  Error: Command failed: /Users/xxxxx/node_modules/cypress/bin/cypress run --config baseUrl=http://localhost:8080/ --config video=false,viewportWidth=1280,viewportHeight=720

The error is caused by two config options set in the command for cypress-cli sent from the plugin.