refactor: add inbound context helpers

src/channels/sender-identity.test.ts

@@ -0,0 +1,30 @@
+import { describe, expect, it } from "vitest";
+
+import type { MsgContext } from "../auto-reply/templating.js";
+import { validateSenderIdentity } from "./sender-identity.js";
+
+describe("validateSenderIdentity", () => {
+  it("allows direct messages without sender fields", () => {
+    const ctx: MsgContext = { ChatType: "direct" };
+    expect(validateSenderIdentity(ctx)).toEqual([]);
+  });
+
+  it("requires some sender identity for non-direct chats", () => {
+    const ctx: MsgContext = { ChatType: "group" };
+    expect(validateSenderIdentity(ctx)).toContain("missing sender identity (SenderId/SenderName/SenderUsername/SenderE164)");
+  });
+
+  it("validates SenderE164 and SenderUsername shape", () => {
+    const ctx: MsgContext = {
+      ChatType: "group",
+      SenderE164: "123",
+      SenderUsername: "@ada lovelace",
+    };
+    expect(validateSenderIdentity(ctx)).toEqual([
+      "invalid SenderE164: 123",
+      'SenderUsername should not include "@": @ada lovelace',
+      "SenderUsername should not include whitespace: @ada lovelace",
+    ]);
+  });
+});
+