Add comprehensive unit tests for IRC command handling and message formatting

- Implemented IrcCommandHandlerTests to cover various IRC commands including PING, JOIN, PART, and authentication scenarios.
- Added IrcMessageFormatterTests to validate message formatting for different message types such as text, images, files, and audio.
- Created IrcMessageTests to ensure correct parsing of IRC messages and handling of various command formats.
- Introduced TestHelpers to facilitate testing with mock connections and streams, including a FakeChatService and FakeEncryptionService for simulating chat behavior.

docs/changelog/index.md

@@ -4,6 +4,8 @@ Release history for EchoHub.
 
 ## Releases
 
+- [v0.2.5](v0.2.5.md) - IRC Gateway Fixes & Test Coverage
+- [v0.2.4](v0.2.4.md) - E2E Message Encryption
 - [v0.2.3](v0.2.3.md) - Moderation, Embeds & UI Overhaul
 - [v0.2.2](v0.2.2.md) - Startup & Shutdown Fixes
 - [v0.2.1](v0.2.1.md) - Shutdown & CI Fixes

docs/changelog/toc.yml

@@ -1,5 +1,7 @@
 - name: Overview
   href: index.md
+- name: v0.2.5
+  href: v0.2.5.md
 - name: v0.2.4
   href: v0.2.4.md
 - name: v0.2.3

docs/changelog/v0.2.4.md

@@ -28,5 +28,5 @@
 - `Encryption:EncryptDatabase` server setting (default `false`) controls whether messages are encrypted at rest
 - DB column max lengths increased for encrypted content: `Message.Content` 2000 → 16000, `Message.EmbedJson` 8000 → 32000
 - EF Core migration: `AddEncryptionSupport`
-- Encryption test suite: server-side, client-side, and cross-compatibility tests (87 total)
+- Encryption test suite: server-side, client-side, and cross-compatibility tests
 - Documentation article: `docs/articles/encryption.md`

docs/changelog/v0.2.5.md

@@ -0,0 +1,14 @@
+# v0.2.5 - IRC Gateway Fixes & Test Coverage
+
+## Fixes
+
+### IRC Gateway
+
+- **Fixed: IRC JOIN history replay showed encrypted gibberish** — `IrcCommandHandler.HandleJoinAsync` now decrypts channel history before formatting for IRC clients (history was encrypted for SignalR transport but sent raw to IRC)
+- **Fixed: `JoinedChannels` race condition** — `IrcClientConnection.JoinedChannels` replaced with thread-safe methods (`JoinChannel`, `LeaveChannel`, `IsInChannel`, `GetJoinedChannels`) using lock synchronization; prevents crashes when broadcaster threads read while the command handler writes
+- **Fixed: `RequireRegistered` fire-and-forget** — converted from sync `bool` to `async Task<bool>` (`RequireRegisteredAsync`) so the error reply is properly awaited before the handler returns
+
+## Infrastructure
+
+- IRC abstraction layer test suite: IrcMessage parsing, IrcMessageFormatter, IrcClientConnection, IrcCommandHandler, IrcBroadcaster (214 total tests)
+- Test helpers: `TestDuplexStream`, `TestIrcConnectionFactory`, `FakeChatService`, `FakeEncryptionService` for IRC unit testing without network I/O