diff --git a/apps/api/src/index.test.ts b/apps/api/src/index.test.ts
new file mode 100644
index 0000000..4724145
--- /dev/null
+++ b/apps/api/src/index.test.ts
@@ -0,0 +1,12 @@
+import { describe, expect, it } from 'vitest';
+
+describe('API App', () => {
+  it('should have a basic test', () => {
+    expect(true).toBe(true);
+  });
+
+  it('should validate API endpoint structure', () => {
+    const endpoint = '/api/v1/users';
+    expect(endpoint).toMatch(/^\/api\/v\d+\/\w+$/);
+  });
+});
diff --git a/apps/app/src/index.test.ts b/apps/app/src/index.test.ts
new file mode 100644
index 0000000..8b33f02
--- /dev/null
+++ b/apps/app/src/index.test.ts
@@ -0,0 +1,13 @@
+import { describe, expect, it } from 'vitest';
+
+describe('App', () => {
+  it('should have a basic test', () => {
+    expect(true).toBe(true);
+  });
+
+  it('should validate app configuration', () => {
+    const config = { name: 'AICD App', version: '1.0.0' };
+    expect(config).toHaveProperty('name');
+    expect(config).toHaveProperty('version');
+  });
+});
diff --git a/apps/web/src/index.test.ts b/apps/web/src/index.test.ts
new file mode 100644
index 0000000..2b95afc
--- /dev/null
+++ b/apps/web/src/index.test.ts
@@ -0,0 +1,12 @@
+import { describe, expect, it } from 'vitest';
+
+describe('Web App', () => {
+  it('should have a basic test', () => {
+    expect(true).toBe(true);
+  });
+
+  it('should validate web route structure', () => {
+    const route = '/dashboard/users';
+    expect(route).toMatch(/^\/\w+(\/\w+)*$/);
+  });
+});
diff --git a/packages/auth/src/index.test.ts b/packages/auth/src/index.test.ts
new file mode 100644
index 0000000..176f0fb
--- /dev/null
+++ b/packages/auth/src/index.test.ts
@@ -0,0 +1,30 @@
+import { describe, expect, it, vi } from 'vitest';
+import { authenticate, createToken } from './index';
+import type { User } from '@aicd/core';
+
+describe('Auth', () => {
+  it('should have an authenticate function', () => {
+    expect(typeof authenticate).toBe('function');
+  });
+
+  it('should return null for any token (placeholder)', () => {
+    const consoleSpy = vi.spyOn(console, 'log');
+    const result = authenticate('test-token');
+    
+    expect(result).toBeNull();
+    expect(consoleSpy).toHaveBeenCalledWith('Authenticating token:', 'test-token');
+    
+    consoleSpy.mockRestore();
+  });
+
+  it('should create a token for a user', () => {
+    const user: User = {
+      id: '123',
+      email: 'test@example.com',
+      name: 'Test User'
+    };
+    
+    const token = createToken(user);
+    expect(token).toBe('token-123');
+  });
+});
diff --git a/packages/cms/src/index.test.ts b/packages/cms/src/index.test.ts
new file mode 100644
index 0000000..eb144a2
--- /dev/null
+++ b/packages/cms/src/index.test.ts
@@ -0,0 +1,37 @@
+import { describe, expect, it, vi } from 'vitest';
+import CMS from './index';
+
+describe('CMS', () => {
+  it('should create a CMS instance', () => {
+    const cms = new CMS();
+    expect(cms).toBeInstanceOf(CMS);
+  });
+
+  it('should return null when getting content', async () => {
+    const cms = new CMS();
+    const consoleSpy = vi.spyOn(console, 'log');
+    
+    const result = await cms.getContent('test-id');
+    
+    expect(result).toBeNull();
+    expect(consoleSpy).toHaveBeenCalledWith('Getting content:', 'test-id');
+    
+    consoleSpy.mockRestore();
+  });
+
+  it('should create content', async () => {
+    const cms = new CMS();
+    const consoleSpy = vi.spyOn(console, 'log');
+    
+    const contentData = {
+      title: 'Test Content',
+      body: 'Test body'
+    };
+    
+    await cms.createContent(contentData);
+    
+    expect(consoleSpy).toHaveBeenCalledWith('Creating content:', contentData);
+    
+    consoleSpy.mockRestore();
+  });
+});
diff --git a/packages/core/src/index.test.ts b/packages/core/src/index.test.ts
new file mode 100644
index 0000000..93341b5
--- /dev/null
+++ b/packages/core/src/index.test.ts
@@ -0,0 +1,33 @@
+import { describe, expect, it } from 'vitest';
+import { formatDate, validateInput } from './index';
+
+describe('formatDate', () => {
+  it('should format a valid date string', () => {
+    const result = formatDate('2024-01-01');
+    expect(result).toMatch(/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{3}Z$/);
+  });
+
+  it('should format a Date object', () => {
+    const date = new Date('2024-01-01');
+    const result = formatDate(date);
+    expect(result).toBe(date.toISOString());
+  });
+
+  it('should throw an error for invalid date', () => {
+    expect(() => formatDate('invalid-date')).toThrow('Invalid date provided');
+  });
+});
+
+describe('validateInput', () => {
+  it('should return true for valid input', () => {
+    expect(validateInput('test')).toBe(true);
+    expect(validateInput('  test  ')).toBe(true);
+  });
+
+  it('should return false for empty or invalid input', () => {
+    expect(validateInput('')).toBe(false);
+    expect(validateInput('   ')).toBe(false);
+    expect(validateInput(null as any)).toBe(false);
+    expect(validateInput(undefined as any)).toBe(false);
+  });
+});
diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
index 5810fa1..cb6c707 100644
--- a/packages/core/src/index.ts
+++ b/packages/core/src/index.ts
@@ -17,4 +17,17 @@ export function validateInput(input: string): boolean {
   return input.trim().length > 0;
 }
 
+/**
+ * Format a date string for consistent display across the application
+ * @param date - The date to format (string or Date object)
+ * @returns Formatted date string in ISO format
+ */
+export function formatDate(date: string | Date): string {
+  const dateObj = typeof date === 'string' ? new Date(date) : date;
+  if (Number.isNaN(dateObj.getTime())) {
+    throw new Error('Invalid date provided');
+  }
+  return dateObj.toISOString();
+}
+
 export * from './types';
diff --git a/packages/database/src/index.test.ts b/packages/database/src/index.test.ts
new file mode 100644
index 0000000..7d431b5
--- /dev/null
+++ b/packages/database/src/index.test.ts
@@ -0,0 +1,38 @@
+import { describe, expect, it, vi } from 'vitest';
+import { Database, type DatabaseConfig } from './index';
+
+describe('Database', () => {
+  it('should create a database instance', () => {
+    const config: DatabaseConfig = {
+      connectionString: 'test://localhost:5432/test'
+    };
+    const db = new Database(config);
+    expect(db).toBeInstanceOf(Database);
+  });
+
+  it('should log connection message', async () => {
+    const config: DatabaseConfig = {
+      connectionString: 'test://localhost:5432/test'
+    };
+    const db = new Database(config);
+    const consoleSpy = vi.spyOn(console, 'log');
+    
+    await db.connect();
+    
+    expect(consoleSpy).toHaveBeenCalledWith('Connecting to database with connection string: test://localhost:5432/test');
+    consoleSpy.mockRestore();
+  });
+
+  it('should log disconnect message', async () => {
+    const config: DatabaseConfig = {
+      connectionString: 'test://localhost:5432/test'
+    };
+    const db = new Database(config);
+    const consoleSpy = vi.spyOn(console, 'log');
+    
+    await db.disconnect();
+    
+    expect(consoleSpy).toHaveBeenCalledWith('Disconnecting from database...');
+    consoleSpy.mockRestore();
+  });
+});