tests: standardize file structure & naming

test/test_ipv6/test_ipv6-prefer-ipv4-network.py

@@ -0,0 +1,16 @@
+def test_forwards_to_ipv4_only_network(docker_compose, nginxproxy):
+    r = nginxproxy.get("http://ipv4only.nginx-proxy.tld/port")
+    assert r.status_code == 200   
+    assert r.text == "answer from port 80\n"
+
+
+def test_forwards_to_dualstack_network(docker_compose, nginxproxy):
+    r = nginxproxy.get("http://dualstack.nginx-proxy.tld")
+    assert r.status_code == 200   
+    assert "Welcome to nginx!" in r.text
+
+
+def test_dualstack_network_prefer_ipv4_config(docker_compose, nginxproxy):
+    conf = nginxproxy.get_conf().decode('ASCII')
+    assert "IPv6 address: fd00:cafe:face:feed::2 (ignored; reachable but IPv4 prefered)" in conf
+    assert "server 172.16.20.2:80;" in conf