added cli-covarage tool and fixed more tests

libs/utils/test/user-agent.test.ts

@@ -0,0 +1,60 @@
+import { describe, expect, it } from 'bun:test';
+import { getRandomUserAgent } from '../src/user-agent';
+
+describe('User Agent', () => {
+  describe('getRandomUserAgent', () => {
+    it('should return a user agent string', () => {
+      const userAgent = getRandomUserAgent();
+      expect(typeof userAgent).toBe('string');
+      expect(userAgent.length).toBeGreaterThan(0);
+    });
+
+    it('should return a valid user agent containing Mozilla', () => {
+      const userAgent = getRandomUserAgent();
+      expect(userAgent).toContain('Mozilla');
+    });
+
+    it('should return different user agents on multiple calls', () => {
+      const userAgents = new Set();
+      // Get 20 user agents
+      for (let i = 0; i < 20; i++) {
+        userAgents.add(getRandomUserAgent());
+      }
+      // Should have at least 2 different user agents
+      expect(userAgents.size).toBeGreaterThan(1);
+    });
+
+    it('should return user agents with browser identifiers', () => {
+      const userAgent = getRandomUserAgent();
+      const hasBrowser =
+        userAgent.includes('Chrome') ||
+        userAgent.includes('Firefox') ||
+        userAgent.includes('Safari') ||
+        userAgent.includes('Edg');
+      expect(hasBrowser).toBe(true);
+    });
+
+    it('should return user agents with OS identifiers', () => {
+      const userAgent = getRandomUserAgent();
+      const hasOS =
+        userAgent.includes('Windows') ||
+        userAgent.includes('Macintosh') ||
+        userAgent.includes('Mac OS X');
+      expect(hasOS).toBe(true);
+    });
+
+    it('should handle multiple concurrent calls', () => {
+      const promises = Array(10)
+        .fill(null)
+        .map(() => Promise.resolve(getRandomUserAgent()));
+      
+      return Promise.all(promises).then(userAgents => {
+        expect(userAgents).toHaveLength(10);
+        userAgents.forEach(ua => {
+          expect(typeof ua).toBe('string');
+          expect(ua.length).toBeGreaterThan(0);
+        });
+      });
+    });
+  });
+});