nginx-proxy/test/test_default-host/test_default-host.yml

services:
  # GIVEN a webserver with VIRTUAL_HOST set to web1.tld
  web1:
    image: web
    expose:
      - "81"
    environment:
      WEB_PORTS: "81"
      VIRTUAL_HOST: web1.tld

  # WHEN nginx-proxy runs with DEFAULT_HOST set to web1.tld
  sut:
    image: nginxproxy/nginx-proxy:test
    volumes:
      - /var/run/docker.sock:/tmp/docker.sock:ro
    environment:
      DEFAULT_HOST: web1.tld