fix: harden restart recovery flow

src/restart-context.test.ts

@@ -0,0 +1,90 @@
+import { describe, expect, it } from 'vitest';
+
+import {
+  getInterruptedRecoveryCandidates,
+  type RestartContext,
+} from './restart-context.js';
+import type { RegisteredGroup } from './types.js';
+
+function makeGroup(folder: string): RegisteredGroup {
+  return {
+    name: folder,
+    folder,
+    trigger: '@Andy',
+    added_at: new Date().toISOString(),
+    requiresTrigger: false,
+  };
+}
+
+describe('getInterruptedRecoveryCandidates', () => {
+  it('returns only registered interrupted groups and deduplicates by chatJid', () => {
+    const registeredGroups: Record<string, RegisteredGroup> = {
+      'dc:1': makeGroup('group-one'),
+      'dc:2': makeGroup('group-two'),
+    };
+
+    const context: RestartContext = {
+      chatJid: 'dc:main',
+      summary: 'restart',
+      verify: [],
+      writtenAt: new Date().toISOString(),
+      interruptedGroups: [
+        {
+          chatJid: 'dc:1',
+          groupName: 'one',
+          status: 'processing',
+          elapsedMs: 1000,
+          pendingMessages: true,
+          pendingTasks: 0,
+        },
+        {
+          chatJid: 'dc:1',
+          groupName: 'one-duplicate',
+          status: 'waiting',
+          elapsedMs: null,
+          pendingMessages: false,
+          pendingTasks: 1,
+        },
+        {
+          chatJid: 'dc:2',
+          groupName: 'two',
+          status: 'idle',
+          elapsedMs: null,
+          pendingMessages: false,
+          pendingTasks: 0,
+        },
+        {
+          chatJid: 'dc:3',
+          groupName: 'missing',
+          status: 'processing',
+          elapsedMs: 500,
+          pendingMessages: true,
+          pendingTasks: 0,
+        },
+      ],
+    };
+
+    expect(
+      getInterruptedRecoveryCandidates(context, registeredGroups),
+    ).toEqual([
+      {
+        chatJid: 'dc:1',
+        groupFolder: 'group-one',
+        status: 'processing',
+        pendingMessages: true,
+        pendingTasks: 0,
+      },
+      {
+        chatJid: 'dc:2',
+        groupFolder: 'group-two',
+        status: 'idle',
+        pendingMessages: false,
+        pendingTasks: 0,
+      },
+    ]);
+  });
+
+  it('returns empty when there is no explicit restart context', () => {
+    expect(getInterruptedRecoveryCandidates(null, {})).toEqual([]);
+  });
+});