test: add massive scaling tests for urls utilities

utils/urls.massive-scaling.test.ts

@@ -0,0 +1,66 @@
+import { describe, expect, it, vi, afterEach } from 'vitest';
+import { getDashboardUrl, getOrigin } from './urls';
+
+afterEach(() => {
+  vi.unstubAllGlobals();
+  delete process.env.NEXT_PUBLIC_SITE_URL;
+});
+
+describe('urls Massive Data Sets & Extreme High Bounds Scaling', () => {
+  it('1. handles extremely long usernames without truncation or corruption', () => {
+    vi.stubGlobal('window', { location: { origin: 'https://example.com' } });
+
+    const massiveUsername = 'a'.repeat(100000);
+    const url = getDashboardUrl(massiveUsername);
+
+    expect(url.startsWith('https://example.com/dashboard/')).toBe(true);
+    expect(url.endsWith(massiveUsername)).toBe(true);
+  });
+
+  it('2. safely encodes massive usernames containing spaces and special characters', () => {
+    vi.stubGlobal('window', { location: { origin: 'https://example.com' } });
+
+    const massiveUsername = 'john doe @#$%^&*() '.repeat(5000).trim();
+    const url = getDashboardUrl(massiveUsername);
+
+    expect(url).toContain(encodeURIComponent('john doe'));
+    expect(url).toContain('%40');
+  });
+
+  it('3. processes massive volumes of dashboard URL generation within performance limits', () => {
+    vi.stubGlobal('window', { location: { origin: 'https://example.com' } });
+
+    const start = performance.now();
+
+    for (let i = 0; i < 100000; i++) {
+      getDashboardUrl(`user-${i}`);
+    }
+
+    const duration = performance.now() - start;
+    expect(duration).toBeLessThan(process.env.CI ? 10000 : 3000);
+  });
+
+  it('4. handles extremely large NEXT_PUBLIC_SITE_URL values correctly', () => {
+    vi.stubGlobal('window', undefined);
+
+    process.env.NEXT_PUBLIC_SITE_URL = 'https://example.com/' + 'segment/'.repeat(5000);
+
+    const origin = getOrigin();
+
+    expect(new URL(origin).origin).toBe('https://example.com');
+  });
+
+  it('5. remains stable under repeated high-volume origin resolution calls', () => {
+    vi.stubGlobal('window', undefined);
+    process.env.NEXT_PUBLIC_SITE_URL = 'https://staging.commitpulse.app';
+
+    const start = performance.now();
+
+    for (let i = 0; i < 100000; i++) {
+      expect(getOrigin()).toBe('https://staging.commitpulse.app');
+    }
+
+    const duration = performance.now() - start;
+    expect(duration).toBeLessThan(process.env.CI ? 10000 : 3000);
+  });
+});