tests: Add tests for how Let's Encrypt ACME challenge is handled

At the moment no changes to functionality are done, only the current
behavior is captured.

test/test_ssl/test_virtual_path.py

@@ -1,4 +1,5 @@
 import pytest
+from requests import ConnectionError
 
 @pytest.mark.parametrize("path", ["web1", "web2"])
 def test_web1_http_redirects_to_https(docker_compose, nginxproxy, path):
@@ -13,3 +14,11 @@ def test_web1_https_is_forwarded(docker_compose, nginxproxy, path, port):
     assert r.status_code == 200
     assert "answer from port %d\n" % port in r.text
 
+
+@pytest.mark.parametrize("port", [81, 82])
+def test_acme_challenge_does_not_work(docker_compose, nginxproxy, acme_challenge_path, port):
+    with pytest.raises(ConnectionError):
+        nginxproxy.get(
+            f"http://www.nginx-proxy.tld:{port}/{acme_challenge_path}",
+            allow_redirects=False
+        )