test: Add test case for default app redirect

Co-authored-by: Jonathan Underwood <junderwood@bitcoinbank.co.jp>

test/test_virtual-path/test_forwarding.py

@@ -0,0 +1,18 @@
+import pytest
+
+def test_root_redirects_to_web1(docker_compose, nginxproxy):
+    r = nginxproxy.get("http://www.nginx-proxy.tld/port", allow_redirects=False)
+    assert r.status_code == 301
+    assert "Location" in r.headers
+    assert "http://www.nginx-proxy.tld/web1/port" == r.headers['Location']
+
+def test_direct_access(docker_compose, nginxproxy):
+    r = nginxproxy.get("http://www.nginx-proxy.tld/web1/port", allow_redirects=False)
+    assert r.status_code == 200
+    assert "answer from port 81\n" in r.text
+
+def test_root_is_forwarded(docker_compose, nginxproxy):
+    r = nginxproxy.get("http://www.nginx-proxy.tld/port", allow_redirects=True)
+    assert r.status_code == 200
+    assert "answer from port 81\n" in r.text
+

test/test_virtual-path/test_forwarding.yml

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+web1:
+  image: web
+  expose:
+    - "81"
+  environment:
+    WEB_PORTS: "81"
+    VIRTUAL_HOST: "www.nginx-proxy.tld"
+    VIRTUAL_PATH: "/web1/"
+    VIRTUAL_DEST: "/"
+
+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
+    - ./certs:/etc/nginx/certs:ro
+  environment:
+    - DEFAULT_ROOT=301 http://$$host/web1$$request_uri