Add more packages to require-dev
What's needed alltogether:
"require": {
"behat/behat": "~3.0.6",
"behat/mink": "1.7.x-dev",
"behat/mink-goutte-driver": "^1.2",
"behat/mink-selenium2-driver": "^1.3",
"behat/web-api-extension": "dev-master",
"drupal/coder": "^8.2.12",
"drupal/drupal-extension": "^3.1",
"drush/drush": "@stable",
"feature-browser/feature-browser": "~1.0",
"jcalderonzumba/gastonjs": "^1.0.2",
"jcalderonzumba/mink-phantomjs-driver": "^0.3.1",
"mikey179/vfsStream": "^1.2",
"phpspec/prophecy": "^1.4",
"phpunit/phpunit": "^4.8.35 || ^6.1",
"symfony/css-selector": "^3.4.0",
"symfony/debug": "^3.4.0",
"symfony/phpunit-bridge": "^3.4.3",
},
Edited by Jürgen Haas