WIP: add remote_endpoint_test

test/remote_endpoint_test.zig

@@ -0,0 +1,100 @@
+const std = @import("std");
+const thespian = @import("thespian");
+const cbor = @import("cbor");
+const framing = @import("framing");
+const protocol = @import("protocol");
+const endpoint = @import("endpoint");
+const build_options = @import("build_options");
+
+const Allocator = std.mem.Allocator;
+const result = thespian.result;
+const unexpected = thespian.unexpected;
+const pid_ref = thespian.pid_ref;
+const Receiver = thespian.Receiver;
+const message = thespian.message;
+const extract = thespian.extract;
+
+/// Top-level test actor. Registers as "test_receiver", spawns the endpoint,
+/// sends ["hello"] to the child's echo actor, and verifies the reply.
+const TestActor = struct {
+    allocator: Allocator,
+    ep: thespian.pid,
+    receiver: Receiver(*@This()),
+
+    const Args = struct { allocator: Allocator };
+
+    fn start(args: Args) result {
+        return init(args) catch |e| return thespian.exit_error(e, @errorReturnTrace());
+    }
+
+    fn init(args: Args) !void {
+        // Register self so the endpoint can deliver the echo reply here.
+        thespian.env.get().proc_set("test_receiver", thespian.self_pid().ref());
+
+        const argv = try args.allocator.dupe(u8, message.fmt(.{build_options.remote_child_endpoint_path}).buf);
+        const ep = try thespian.spawn_link(
+            args.allocator,
+            endpoint.Args{
+                .allocator = args.allocator,
+                .argv = argv,
+            },
+            endpoint.start,
+            "endpoint",
+        );
+
+        // Send ["hello"] to the child's "echo" actor through the endpoint.
+        try ep.send(.{ "send", @as(u64, 1), "echo", .{"hello"} });
+
+        const self = try args.allocator.create(@This());
+        self.* = .{
+            .allocator = args.allocator,
+            .ep = ep,
+            .receiver = .init(receive_fn, deinit, self),
+        };
+        errdefer self.deinit();
+        thespian.receive(&self.receiver);
+    }
+
+    fn deinit(self: *@This()) void {
+        self.ep.deinit();
+        self.allocator.destroy(self);
+    }
+
+    fn receive_fn(self: *@This(), from: pid_ref, m: message) result {
+        return self.receive(from, m) catch |e| return thespian.exit_error(e, @errorReturnTrace());
+    }
+
+    fn receive(_: *@This(), _: pid_ref, m: message) !void {
+        // The endpoint delivers the echo reply as the raw payload: ["hello"]
+        if (try m.match(.{"hello"})) {
+            return thespian.exit("success");
+        } else {
+            return unexpected(m);
+        }
+    }
+};
+
+test "remote: endpoint delivers message cross-process and receives reply" {
+    const allocator = std.testing.allocator;
+    var ctx = try thespian.context.init(allocator);
+    defer ctx.deinit();
+
+    var success = false;
+    var exit_handler = thespian.make_exit_handler(&success, struct {
+        fn handle(ok: *bool, status: []const u8) void {
+            ok.* = std.mem.eql(u8, status, "success");
+        }
+    }.handle);
+
+    _ = try ctx.spawn_link(
+        TestActor.Args{ .allocator = allocator },
+        TestActor.start,
+        "test_actor",
+        &exit_handler,
+        null,
+    );
+
+    ctx.run();
+
+    if (!success) return error.TestFailed;
+}