Use Yahoo Finance company descriptions

lib/server/yahoo-company-profile.test.ts

@@ -0,0 +1,66 @@
+import { beforeEach, describe, expect, it, mock } from 'bun:test';
+import {
+  __yahooCompanyProfileInternals,
+  getYahooCompanyDescription
+} from './yahoo-company-profile';
+
+describe('yahoo company profile', () => {
+  beforeEach(() => {
+    __yahooCompanyProfileInternals.resetCaches();
+  });
+
+  it('extracts a Yahoo session cookie from response headers', () => {
+    const headers = new Headers();
+    headers.append('set-cookie', 'A3=session-token; Domain=.yahoo.com; Path=/; Secure; HttpOnly');
+
+    expect(__yahooCompanyProfileInternals.pickYahooSessionCookie(headers)).toBe('A3=session-token');
+  });
+
+  it('normalizes and clips long descriptions', () => {
+    const value = `  Microsoft   builds software.\n\n\n${'x'.repeat(1800)}  `;
+    const normalized = __yahooCompanyProfileInternals.normalizeDescription(value);
+
+    expect(normalized).toContain('Microsoft builds software.');
+    expect((normalized?.length ?? 0) <= 1600).toBe(true);
+  });
+
+  it('fetches longBusinessSummary through Yahoo cookie and crumb endpoints', async () => {
+    const fetchMock = mock(async (input: string | URL | Request) => {
+      const url = String(input);
+
+      if (url === 'https://fc.yahoo.com') {
+        return new Response('', {
+          status: 404,
+          headers: {
+            'set-cookie': 'A3=session-token; Domain=.yahoo.com; Path=/; Secure; HttpOnly'
+          }
+        });
+      }
+
+      if (url === 'https://query1.finance.yahoo.com/v1/test/getcrumb') {
+        return new Response('crumb-token', { status: 200 });
+      }
+
+      if (url === 'https://query1.finance.yahoo.com/v10/finance/quoteSummary/MSFT?modules=assetProfile&crumb=crumb-token') {
+        return Response.json({
+          quoteSummary: {
+            result: [
+              {
+                assetProfile: {
+                  longBusinessSummary: 'Microsoft builds cloud and software products worldwide.'
+                }
+              }
+            ]
+          }
+        });
+      }
+
+      throw new Error(`Unexpected URL: ${url}`);
+    }) as unknown as typeof fetch;
+
+    const description = await getYahooCompanyDescription('msft', { fetchImpl: fetchMock });
+
+    expect(description).toBe('Microsoft builds cloud and software products worldwide.');
+    expect(fetchMock).toHaveBeenCalledTimes(3);
+  });
+});