Codeception JSON fromat reporter, can be used in parallel run. This extension add another type of json report generator, since original one from PHPUnit is nor really suitble

1. Install Codeception via Composer
2. Add zondor/codeception-json-reporter": "*" to your composer.json
3. Run composer install.
4. Include extensions into codeception.yml configuration:

Sample:

paths:
    tests: tests
    log: tests/_log
    data: tests/_data
    helpers: tests/_helpers
reporters:
    json: Codeception\Reporter\Json

Then can be run us ususal reporter

php ./vendor/bin/codeception run --json=report.json