cluster/services/incandescence: test in simulacrum

cluster/services/incandescence/default.nix

@@ -3,6 +3,7 @@
 {
   imports = [
     ./options.nix
+    ./simulacrum/test-data.nix
   ];
 
   services.incandescence = {
@@ -15,6 +16,10 @@
         ./provider-options.nix
       ];
     };
-    simulacrum.deps = [ "consul" ];
+    simulacrum = {
+      enable = true;
+      deps = [ "consul" "locksmith" ];
+      settings = ./simulacrum/test.nix;
+    };
   };
 }

cluster/services/incandescence/simulacrum/test-data.nix

@@ -0,0 +1,8 @@
+{ config, lib, ... }:
+{
+  incandescence = lib.mkIf config.simulacrum {
+    providers = config.lib.forService "incandescence" {
+      test.objects.example = [ "example1" "example2" ];
+    };
+  };
+}

cluster/services/incandescence/simulacrum/test.nix

@@ -0,0 +1,47 @@
+{ cluster, lib, ... }:
+
+let
+  providers = lib.take 2 cluster.config.services.incandescence.nodes.provider;
+in
+
+{
+  nodes = lib.genAttrs providers (lib.const {
+    services.incandescence.providers.test = {
+      wantedBy = [ "multi-user.target" ];
+      partOf = [ ];
+      formulae.example = {
+        create = x: "consul kv put testData/${x} ${x}";
+        destroy = "consul kv delete testData/$OBJECT";
+      };
+    };
+  });
+
+  testScript = ''
+    import json
+    nodeNames = json.loads('${builtins.toJSON providers}')
+    nodes = [ n for n in machines if n.name in nodeNames ]
+
+    start_all()
+
+    consulConfig = json.loads(nodes[0].succeed("cat /etc/consul.json"))
+    addr = consulConfig["addresses"]["http"]
+    port = consulConfig["ports"]["http"]
+    setEnv = f"CONSUL_HTTP_ADDR={addr}:{port}"
+
+    with subtest("should create objects"):
+      for node in nodes:
+        node.wait_for_unit("incandescence-test.target")
+      nodes[0].succeed(f"[[ $({setEnv} consul kv get testData/example1) == example1 ]]")
+      nodes[0].succeed(f"[[ $({setEnv} consul kv get testData/example2) == example2 ]]")
+
+    with subtest("should destroy objects"):
+      nodes[0].succeed(f"{setEnv} consul kv put testData/example3 example3")
+      nodes[0].succeed(f"{setEnv} consul kv put services/incandescence/providers/test/formulae/example/example3/alive true")
+      nodes[1].succeed(f"{setEnv} consul kv get testData/example3")
+      for node in nodes:
+        node.systemctl("isolate default")
+      for node in nodes:
+        node.wait_for_unit("incandescence-test.target")
+      nodes[0].fail(f"{setEnv} consul kv get testData/example3")
+  '';
+}