feat: replace browser login with imported Reddit sessions

tests/reddit-session-exporter.test.ts

@@ -0,0 +1,51 @@
+import { describe, expect, it } from 'vitest';
+import { createSessionExportDownload } from '../extensions/reddit-session-exporter/session-export.js';
+
+describe('createSessionExportDownload', () => {
+  it('creates a JSON data URL that Chrome can download from a service worker', () => {
+    const download = createSessionExportDownload([
+      {
+        name: 'reddit_session',
+        value: 'secret',
+        domain: '.reddit.com',
+        path: '/',
+        expirationDate: 1_800_000_000,
+        httpOnly: true,
+        secure: true,
+        sameSite: 'lax',
+      },
+    ], {
+      homeserver: 'https://matrix.redditspace.com',
+      accessToken: 'matrix-secret',
+      userId: '@t2_bot:reddit.com',
+      capturedAt: 1_700_000_000_000,
+    });
+
+    expect(download.filename).toBe('redditbot-session.json');
+    expect(download.url).toMatch(/^data:application\/json;charset=utf-8,/);
+    expect(JSON.parse(decodeURIComponent(download.url.split(',')[1]))).toEqual({
+      cookies: [
+        {
+          name: 'reddit_session',
+          value: 'secret',
+          domain: '.reddit.com',
+          path: '/',
+          expires: 1_800_000_000,
+          httpOnly: true,
+          secure: true,
+          sameSite: 'lax',
+        },
+      ],
+      matrix: {
+        homeserver: 'https://matrix.redditspace.com',
+        accessToken: 'matrix-secret',
+        userId: '@t2_bot:reddit.com',
+        capturedAt: 1_700_000_000_000,
+      },
+    });
+  });
+
+  it('refuses to create an incomplete dump without Matrix credentials', () => {
+    expect(() => createSessionExportDownload([], null)).toThrow(/Reddit Chat/i);
+  });
+});