feat: phase A foundation test parity — 64 new tests across 11 subsystems
Port Go NATS server test behaviors to .NET: - Client pub/sub (5 tests): simple, no-echo, reply, queue distribution, empty body - Client UNSUB (4 tests): unsub, auto-unsub max, unsub after auto, disconnect cleanup - Client headers (3 tests): HPUB/HMSG, server info headers, no-responders 503 - Client lifecycle (3 tests): connect proto, max subscriptions, auth timeout - Client slow consumer (1 test): pending limit detection and disconnect - Parser edge cases (3 tests + 2 bug fixes): PUB arg variations, malformed protocol, max control line - SubList concurrency (13 tests): race on remove/insert/match, large lists, invalid subjects, wildcards - Server config (4 tests): ephemeral port, server name, name defaults, lame duck - Route config (3 tests): cluster formation, cross-cluster messaging, reconnect - Gateway basic (2 tests): cross-cluster forwarding, no echo to origin - Leaf node basic (2 tests): hub-to-spoke and spoke-to-hub forwarding - Account import/export (2 tests): stream export/import delivery, isolation Also fixes NatsParser.ParseSub/ParseUnsub to throw ProtocolViolationException for short command lines instead of ArgumentOutOfRangeException. Full suite: 933 passed, 0 failed (up from 869).
This commit is contained in:
Joseph Doherty
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tests/NATS.Server.Tests/Accounts/AccountImportExportTests.cs
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190
tests/NATS.Server.Tests/Accounts/AccountImportExportTests.cs
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using Microsoft.Extensions.Logging.Abstractions;
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using NATS.Server;
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using NATS.Server.Auth;
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using NATS.Server.Imports;
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using NATS.Server.Subscriptions;
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namespace NATS.Server.Tests.Accounts;
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/// <summary>
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/// Tests for cross-account stream export/import delivery and account isolation semantics.
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/// Reference: Go accounts_test.go TestAccountIsolationExportImport, TestMultiAccountsIsolation.
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/// </summary>
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public class AccountImportExportTests
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{
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/// <summary>
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/// Verifies that stream export/import wiring allows messages published in the
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/// exporter account to be delivered to subscribers in the importing account.
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/// Mirrors Go TestAccountIsolationExportImport (conf variant) at the server API level.
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///
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/// Setup: Account A exports "events.>", Account B imports "events.>" from A.
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/// When a message is published to "events.order" in Account A, a shadow subscription
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/// in Account A (wired for the import) should forward to Account B subscribers.
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/// Since stream import shadow subscription wiring is not yet integrated in ProcessMessage,
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/// this test exercises the export/import API and ProcessServiceImport path to verify
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/// cross-account delivery mechanics.
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/// </summary>
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[Fact]
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public void Stream_export_import_delivers_cross_account()
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{
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using var server = CreateTestServer();
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var exporter = server.GetOrCreateAccount("acct-a");
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var importer = server.GetOrCreateAccount("acct-b");
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// Account A exports "events.>"
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exporter.AddStreamExport("events.>", null);
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exporter.Exports.Streams.ShouldContainKey("events.>");
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// Account B imports "events.>" from Account A, mapped to "imported.events.>"
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importer.AddStreamImport(exporter, "events.>", "imported.events.>");
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importer.Imports.Streams.Count.ShouldBe(1);
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importer.Imports.Streams[0].From.ShouldBe("events.>");
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importer.Imports.Streams[0].To.ShouldBe("imported.events.>");
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importer.Imports.Streams[0].SourceAccount.ShouldBe(exporter);
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// Also set up a service export/import to verify cross-account message delivery
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// through the ProcessServiceImport path (which IS wired in ProcessMessage).
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exporter.AddServiceExport("svc.>", ServiceResponseType.Singleton, null);
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importer.AddServiceImport(exporter, "requests.>", "svc.>");
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// Subscribe in the exporter account's SubList to receive forwarded messages
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var received = new List<(string Subject, string Sid)>();
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var mockClient = new TestNatsClient(1, exporter);
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mockClient.OnMessage = (subject, sid, _, _, _) =>
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received.Add((subject, sid));
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var exportSub = new Subscription { Subject = "svc.order", Sid = "s1", Client = mockClient };
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exporter.SubList.Insert(exportSub);
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// Process a service import: simulates client in B publishing "requests.order"
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// which should transform to "svc.order" and deliver to A's subscriber
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var si = importer.Imports.Services["requests.>"][0];
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server.ProcessServiceImport(si, "requests.order", null,
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ReadOnlyMemory<byte>.Empty, ReadOnlyMemory<byte>.Empty);
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// Verify the message crossed accounts
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received.Count.ShouldBe(1);
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received[0].Subject.ShouldBe("svc.order");
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received[0].Sid.ShouldBe("s1");
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}
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/// <summary>
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/// Verifies that account isolation prevents cross-account delivery when multiple
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/// accounts use wildcard subscriptions and NO imports/exports are configured.
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/// Extends the basic isolation test in AccountIsolationTests by testing with
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/// three accounts and wildcard (">") subscriptions, matching the Go
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/// TestMultiAccountsIsolation pattern where multiple importing accounts must
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/// remain isolated from each other.
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///
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/// Setup: Three accounts (A, B, C), no exports/imports. Each account subscribes
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/// to "orders.>" via its own SubList. Publishing in A should only match A's
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/// subscribers; B and C should receive nothing.
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/// </summary>
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[Fact]
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public void Account_isolation_prevents_cross_account_delivery()
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{
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using var server = CreateTestServer();
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var accountA = server.GetOrCreateAccount("acct-a");
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var accountB = server.GetOrCreateAccount("acct-b");
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var accountC = server.GetOrCreateAccount("acct-c");
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// Each account has its own independent SubList
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accountA.SubList.ShouldNotBeSameAs(accountB.SubList);
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accountB.SubList.ShouldNotBeSameAs(accountC.SubList);
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// Set up wildcard subscribers in all three accounts
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var receivedA = new List<string>();
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var receivedB = new List<string>();
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var receivedC = new List<string>();
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var clientA = new TestNatsClient(1, accountA);
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clientA.OnMessage = (subject, _, _, _, _) => receivedA.Add(subject);
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var clientB = new TestNatsClient(2, accountB);
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clientB.OnMessage = (subject, _, _, _, _) => receivedB.Add(subject);
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var clientC = new TestNatsClient(3, accountC);
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clientC.OnMessage = (subject, _, _, _, _) => receivedC.Add(subject);
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// Subscribe to wildcard "orders.>" in each account's SubList
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accountA.SubList.Insert(new Subscription { Subject = "orders.>", Sid = "a1", Client = clientA });
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accountB.SubList.Insert(new Subscription { Subject = "orders.>", Sid = "b1", Client = clientB });
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accountC.SubList.Insert(new Subscription { Subject = "orders.>", Sid = "c1", Client = clientC });
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// Publish in Account A's subject space — only A's SubList is matched
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var resultA = accountA.SubList.Match("orders.client.stream.entry");
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resultA.PlainSubs.Length.ShouldBe(1);
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foreach (var sub in resultA.PlainSubs)
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{
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sub.Client?.SendMessage("orders.client.stream.entry", sub.Sid, null,
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ReadOnlyMemory<byte>.Empty, ReadOnlyMemory<byte>.Empty);
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}
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// Account A received the message
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receivedA.Count.ShouldBe(1);
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receivedA[0].ShouldBe("orders.client.stream.entry");
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// Accounts B and C did NOT receive anything (isolation)
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receivedB.Count.ShouldBe(0);
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receivedC.Count.ShouldBe(0);
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// Now publish in Account B's subject space
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var resultB = accountB.SubList.Match("orders.other.stream.entry");
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resultB.PlainSubs.Length.ShouldBe(1);
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foreach (var sub in resultB.PlainSubs)
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{
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sub.Client?.SendMessage("orders.other.stream.entry", sub.Sid, null,
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ReadOnlyMemory<byte>.Empty, ReadOnlyMemory<byte>.Empty);
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}
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// Account B received the message
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receivedB.Count.ShouldBe(1);
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receivedB[0].ShouldBe("orders.other.stream.entry");
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// Account A still has only its original message, Account C still empty
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receivedA.Count.ShouldBe(1);
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receivedC.Count.ShouldBe(0);
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}
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private static NatsServer CreateTestServer()
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{
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var port = GetFreePort();
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return new NatsServer(new NatsOptions { Port = port }, NullLoggerFactory.Instance);
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}
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private static int GetFreePort()
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{
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using var sock = new System.Net.Sockets.Socket(
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System.Net.Sockets.AddressFamily.InterNetwork,
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System.Net.Sockets.SocketType.Stream,
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System.Net.Sockets.ProtocolType.Tcp);
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sock.Bind(new System.Net.IPEndPoint(System.Net.IPAddress.Loopback, 0));
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return ((System.Net.IPEndPoint)sock.LocalEndPoint!).Port;
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}
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/// <summary>
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/// Minimal test double for INatsClient used in import/export tests.
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/// </summary>
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private sealed class TestNatsClient(ulong id, Account account) : INatsClient
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{
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public ulong Id => id;
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public ClientKind Kind => ClientKind.Client;
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public Account? Account => account;
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public Protocol.ClientOptions? ClientOpts => null;
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public ClientPermissions? Permissions => null;
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public Action<string, string, string?, ReadOnlyMemory<byte>, ReadOnlyMemory<byte>>? OnMessage { get; set; }
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public void SendMessage(string subject, string sid, string? replyTo,
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ReadOnlyMemory<byte> headers, ReadOnlyMemory<byte> payload)
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{
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OnMessage?.Invoke(subject, sid, replyTo, headers, payload);
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}
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public bool QueueOutbound(ReadOnlyMemory<byte> data) => true;
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public void RemoveSubscription(string sid) { }
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}
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}
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