Proposed changes

Continuation of 5458 and 5445, this feature allows running Multiremote in parallel by passing an array of multiremote capabilities.

capabilities: [
        {
            browser1: { capabilities: { browserName: 'chrome' } },
            browser2: { capabilities: { browserName: 'chrome' } }
        },
        {
            browser1: { capabilities: { browserName: 'firefox' } },
            browser2: { capabilities: { browserName: 'firefox' } }
        },
        {
            browser1: { capabilities: { browserName: 'chrome' } },
            browser2: { capabilities: { browserName: 'firefox' } }
        }
    ],

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• I have added proper type definitions for new commands (if appropriate)

Further comments

I try to do this by not adding any new configuration, but instead adding logic to determine if the objects inside capabilities array are of multiremote type by checking for the 'capabilities' field. To use it, a user just have to put multiremote object in an array.

capabilities: [
        {
            browser1: { capabilities: { browserName: 'chrome' } },
            browser2: { capabilities: { browserName: 'chrome' } }
        },
        {
            browser1: { capabilities: { browserName: 'firefox' } },
            browser2: { capabilities: { browserName: 'firefox' } }
        },
    ],

I have run some test locally using devtools and selenium service and it went well.

I also try to make changes to other services that require it. However, I can only test non-cloud services locally. If there is any other place that I miss applying the changes, please let me know.

Reviewers: @webdriverio/project-committers