The testing environment in TeamCity can be found at https://hashicorp.teamcity.com/
For details on processes and how to perform tasks in TeamCity, look at PERFORMING_TASKS_IN_TEAMCITY.md
For details on how to use TeamCity configuration files with TeamCity, look at USE_CONFIG_WITH_TEAMCITY.md
For details on contributing to the TeamCity configuration files, look at CONTRIBUTION_GUIDE.md