test: VIRTUAL_PORT != single exposed port

test/test_multiple-ports/test_VIRTUAL_PORT-single-different-from-single-port.py

@@ -0,0 +1,8 @@
+import pytest
+import re
+
+
+def test_answer_is_served_from_virtual_port_which_is_ureachable(docker_compose, nginxproxy):
+    r = nginxproxy.get("http://web.nginx-proxy.tld/port")
+    assert r.status_code == 502
+    assert re.search(r"\n\s+server \d+\.\d+\.\d+\.\d+:90;\n", nginxproxy.get_conf().decode('ASCII'))

test/test_multiple-ports/test_VIRTUAL_PORT-single-different-from-single-port.yml

@@ -0,0 +1,15 @@
+web:
+  image: web
+  expose:
+    - "81"
+  environment:
+    WEB_PORTS: "81"
+    VIRTUAL_HOST: "web.nginx-proxy.tld"
+    VIRTUAL_PORT: "90"
+
+
+sut:
+  image: nginxproxy/nginx-proxy:test
+  volumes:
+    - /var/run/docker.sock:/tmp/docker.sock:ro
+    - ../lib/ssl/dhparam.pem:/etc/nginx/dhparam/dhparam.pem:ro