simple test for docker network using reverse proxy

tests.nix

@@ -6,6 +6,7 @@ with import <nixpkgs/nixos/lib/testing-python.nix> { inherit system pkgs; };
 
 let
   registry = import ./static_registry/default.nix;
+  nginx_image = registry.nginx.nginx_7d0cdcc60a96;
 in
 {
   mytest = makeTest {
@@ -15,23 +16,40 @@ in
       virtualisation.cores = 4;
       virtualisation.memorySize = 1024;
 
-      foo.bar.enable = true;
 
-      docker-containers.nginx = let
-        image = registry.nginx.nginx_7d0cdcc60a96;
-      in
+      docker-networks.web = {
+        usedBy = [ "nginx_alpha" "nginx_bravo" ];
+      };
+      docker-containers.nginx_alpha =
       {
-        image = image.tag;
-        imageFile = image.image;
+        image = nginx_image.tag;
+        imageFile = nginx_image.image;
+        extraDockerOptions = [ "--network=web" ];
         ports = ["8181:80"];
+        volumes = [
+          "${./nginx.conf}:/etc/nginx/conf.d/default.conf:ro"
+          "${./index.alpha.html}:/var/www/html/index.html:ro"
+        ];
+      };
+      docker-containers.nginx_bravo =
+      {
+        image = nginx_image.tag;
+        imageFile = nginx_image.image;
+        extraDockerOptions = [ "--network=web" ];
+        volumes = [
+          "${./nginx.conf}:/etc/nginx/conf.d/default.conf:ro"
+          "${./index.bravo.html}:/var/www/html/index.html:ro"
+        ];
       };
     };
 
     testScript = ''
       machine.start()
-      machine.wait_for_unit("docker-nginx.service")
+      machine.wait_for_unit("docker-nginx_alpha.service")
+      machine.wait_for_unit("docker-nginx_bravo.service")
       machine.wait_for_open_port(8181)
-      machine.wait_until_succeeds("curl http://localhost:8181")
+      machine.wait_until_succeeds("curl http://localhost:8181 | grep alpha")
+      machine.wait_until_succeeds("curl http://localhost:8181/bravo | grep bravo")
     '';
   };
 }