Codeception acceptance tests run before browser starts - selenium

Question

When I run Codeception tests, sometimes on acceptance tests a browser starts too late, tests do not wait for it to start, and I get errors for tests that passed before a browser start:
[ConnectionException] Can't connect to Webdriver at http://127.0.0.1:4444/wd/hub. Please make sure that Selenium Server or PhantomJS is running.
#1 Codeception\Subscriber\Module->before
#2 D:\path\Yii\basic\vendor\symfony\event-dispatcher\EventDispatcher.php:212
#3 D:\path\Yii\basic\vendor\symfony\event-dispatcher\EventDispatcher.php:44
One time a browser didn't start at all.
My command:
C:\Windows\System32\cmd.exe /K "cd /D D:\path\Yii\basic && vendor\bin\codecept run"
acceptance.suite.yml:
class_name: AcceptanceTester
extensions:
enabled:
- Codeception\Extension\RunProcess:
- java -jar -Dwebdriver.chrome.driver="D:/Selenium/chromedriver.exe" -Dwebdriver.gecko.driver="D:/Selenium/geckodriver.exe" "D:/Selenium/selenium-server-standalone-3.6.0.jar"
modules:
enabled:
- WebDriver:
url: https://hotel.localhost/
browser: chrome
- Yii2:
part: orm
entryScript: index-test.php
cleanup: false
codeception.yml:
actor: Tester
paths:
tests: tests
log: tests/_output
data: tests/_data
helpers: tests/_support
settings:
bootstrap: _bootstrap.php
memory_limit: 1024M
colors: true
modules:
config:
Yii2:
configFile: 'config/test.php'
cleanup: false
coverage:
enabled: true
whitelist:
include:
- models/*
- controllers/*
Thank you in advance.

Answer 1

Add some sleep to RunProcess configuration as documented here.
To wait for the process to be launched use sleep option. In this case you need configuration to be specified as object:
extensions:
enabled:
- Codeception\Extension\RunProcess:
0: java -jar ~/selenium-server.jar
1: mailcatcher
sleep: 5 # wait 5 seconds for processes to boot