app.json

  {
      "environments": {
          "test": {
              "scripts": {
                  "test": "python manage.py test"
              },
              "buildpacks": [{
                      "url": "https://github.com/cyberdelia/heroku-geo-buildpack.git"
                  },
                  {
                      "url": "heroku/python"
                  }
              ],
              "env": {
                  "DJANGO_SETTINGS_MODULE": {
                      "value": "config.settings.test"
                  },
                  "LD_LIBRARY_PATH": {
                      "value": "/app/lib"
                  },
                  "BUILD_WITH_GEO_LIBRARIES": {
                      "value": "1"
                  }
              }
          }
      }
  }