refactor: unify DM pairing challenge flows

src/pairing/pairing-challenge.test.ts

@@ -0,0 +1,90 @@
+import { describe, expect, it, vi } from "vitest";
+import { issuePairingChallenge } from "./pairing-challenge.js";
+
+describe("issuePairingChallenge", () => {
+  it("creates and sends a pairing reply when request is newly created", async () => {
+    const sent: string[] = [];
+
+    const result = await issuePairingChallenge({
+      channel: "telegram",
+      senderId: "123",
+      senderIdLine: "Your Telegram user id: 123",
+      upsertPairingRequest: async () => ({ code: "ABCD", created: true }),
+      sendPairingReply: async (text) => {
+        sent.push(text);
+      },
+    });
+
+    expect(result).toEqual({ created: true, code: "ABCD" });
+    expect(sent).toHaveLength(1);
+    expect(sent[0]).toContain("ABCD");
+  });
+
+  it("does not send a reply when request already exists", async () => {
+    const sendPairingReply = vi.fn(async () => {});
+
+    const result = await issuePairingChallenge({
+      channel: "telegram",
+      senderId: "123",
+      senderIdLine: "Your Telegram user id: 123",
+      upsertPairingRequest: async () => ({ code: "ABCD", created: false }),
+      sendPairingReply,
+    });
+
+    expect(result).toEqual({ created: false });
+    expect(sendPairingReply).not.toHaveBeenCalled();
+  });
+
+  it("supports custom reply text builder", async () => {
+    const sent: string[] = [];
+
+    await issuePairingChallenge({
+      channel: "line",
+      senderId: "u1",
+      senderIdLine: "Your line id: u1",
+      upsertPairingRequest: async () => ({ code: "ZXCV", created: true }),
+      buildReplyText: ({ code }) => `custom ${code}`,
+      sendPairingReply: async (text) => {
+        sent.push(text);
+      },
+    });
+
+    expect(sent).toEqual(["custom ZXCV"]);
+  });
+
+  it("calls onCreated and forwards meta to upsert", async () => {
+    const onCreated = vi.fn();
+    const upsert = vi.fn(async () => ({ code: "1111", created: true }));
+
+    await issuePairingChallenge({
+      channel: "discord",
+      senderId: "42",
+      senderIdLine: "Your Discord user id: 42",
+      meta: { name: "alice" },
+      upsertPairingRequest: upsert,
+      onCreated,
+      sendPairingReply: async () => {},
+    });
+
+    expect(upsert).toHaveBeenCalledWith({ id: "42", meta: { name: "alice" } });
+    expect(onCreated).toHaveBeenCalledWith({ code: "1111" });
+  });
+
+  it("captures reply errors through onReplyError", async () => {
+    const onReplyError = vi.fn();
+
+    const result = await issuePairingChallenge({
+      channel: "signal",
+      senderId: "+1555",
+      senderIdLine: "Your Signal sender id: +1555",
+      upsertPairingRequest: async () => ({ code: "9999", created: true }),
+      sendPairingReply: async () => {
+        throw new Error("send failed");
+      },
+      onReplyError,
+    });
+
+    expect(result).toEqual({ created: true, code: "9999" });
+    expect(onReplyError).toHaveBeenCalledTimes(1);
+  });
+});