Add testcases for nixproc-supervisord-deploy-stateless

tests/webapps-agnostic-supervisord-stateless.nix

@@ -0,0 +1,61 @@
+{nixpkgs ? <nixpkgs>}:
+
+with import "${nixpkgs}/nixos/lib/testing-python.nix" { system = builtins.currentSystem; };
+
+let
+  processesEnvAuto = import ../nixproc/create-managed-process/supervisord/build-supervisord-env.nix {
+    exprFile = ../examples/webapps-agnostic/processes.nix;
+  };
+
+  tools = import ../tools {};
+
+  nix-processmgmt = ./..;
+
+  env = "NIX_PATH=nixpkgs=${nixpkgs}";
+in
+makeTest {
+  machine =
+    {pkgs, ...}:
+
+    {
+      virtualisation.pathsInNixDB = [ pkgs.stdenv ] ++ pkgs.coreutils.all ++ [ processesEnvAuto ];
+      virtualisation.writableStore = true;
+      virtualisation.memorySize = 1024;
+
+      # We can't download any substitutes in a test environment. To make tests
+      # faster, we disable substitutes so that Nix does not waste any time by
+      # attempting to download them.
+      nix.extraOptions = ''
+        substitute = false
+      '';
+
+      environment.systemPackages = [
+        pkgs.stdenv
+        pkgs.pythonPackages.supervisor
+        pkgs.dysnomia
+        tools.build
+        tools.systemd
+        tools.supervisord
+      ];
+    };
+
+  testScript = ''
+    def check_nginx_redirection():
+        machine.succeed(
+            "curl --fail -H 'Host: webapp.local' http://localhost:8080 | grep 'listening on port: 5000'"
+        )
+
+
+    start_all()
+
+    # Deploy the advanced example with multiple instances and see if it works
+
+    machine.succeed(
+        "${env} nixproc-supervisord-deploy-stateless ${nix-processmgmt}/examples/webapps-agnostic/processes.nix &"
+    )
+
+    machine.succeed("sleep 30")
+    machine.succeed("cat supervisord.log >&2")
+    check_nginx_redirection()
+  '';
+}