nixos/hledger-web: init module and test

nixos/tests/all-tests.nix

@@ -155,6 +155,7 @@ in
   # not on other platforms.
   hibernate = handleTestOn ["x86_64-linux"] ./hibernate.nix {};
   hitch = handleTest ./hitch {};
+  hledger-web = handleTest ./hledger-web.nix {};
   hocker-fetchdocker = handleTest ./hocker-fetchdocker {};
   home-assistant = handleTest ./home-assistant.nix {};
   hostname = handleTest ./hostname.nix {};

nixos/tests/hledger-web.nix

@@ -0,0 +1,53 @@
+import ./make-test-python.nix ({ pkgs, lib, ... }:
+let
+  journal = pkgs.writeText "test.journal" ''
+    2010/01/10 Loan
+        assets:cash                 500$
+        income:loan                -500$
+    2010/01/10 NixOS Foundation donation
+        expenses:donation           250$
+        assets:cash                -250$
+  '';
+in
+rec {
+  name = "hledger-web";
+  meta.maintainers = with lib.maintainers; [ marijanp ];
+
+  nodes = {
+    server = { config, pkgs, ... }: rec {
+      services.hledger-web = {
+        host = "127.0.0.1";
+        port = 5000;
+        enable = true;
+        journalFile = journal;
+      };
+      networking.firewall.allowedTCPPorts = [ services.hledger-web.port ];
+    };
+    apiserver = { config, pkgs, ... }: rec {
+      services.hledger-web = {
+        host = "127.0.0.1";
+        port = 5000;
+        enable = true;
+        serveApi = true;
+        journalFile = journal;
+      };
+      networking.firewall.allowedTCPPorts = [ services.hledger-web.port ];
+    };
+  };
+
+  testScript = ''
+    start_all()
+
+    server.wait_for_unit("hledger-web.service")
+    server.wait_for_open_port(5000)
+    with subtest("Check if web UI is accessible"):
+        page = server.succeed("curl -L http://127.0.0.1:5000")
+        assert "test.journal" in page
+
+    apiserver.wait_for_unit("hledger-web.service")
+    apiserver.wait_for_open_port(5000)
+    with subtest("Check if the JSON API is served"):
+        transactions = apiserver.succeed("curl -L http://127.0.0.1:5000/transactions")
+        assert "NixOS Foundation donation" in transactions
+  '';
+})