diff --git a/src/__tests__/components/BaseModal.test.tsx b/src/__tests__/components/BaseModal.test.tsx
new file mode 100644
index 0000000..714940c
--- /dev/null
+++ b/src/__tests__/components/BaseModal.test.tsx
@@ -0,0 +1,59 @@
+import React from 'react';
+import { render, screen } from '@testing-library/react';
+import '@testing-library/jest-dom';
+import { BaseModal } from '../../components/base/BaseModal';
+
+describe('BaseModal', () => {
+  const defaultProps = {
+    isOpen: true,
+    onClose: jest.fn(),
+    title: 'Test Modal',
+    children: <div>Modal Content</div>,
+  };
+
+  it('should render modal when open', () => {
+    render(<BaseModal {...defaultProps} />);
+
+    expect(screen.getByText('Test Modal')).toBeInTheDocument();
+    expect(screen.getByText('Modal Content')).toBeInTheDocument();
+  });
+
+  it('should not render modal when closed', () => {
+    render(<BaseModal {...defaultProps} isOpen={false} />);
+
+    expect(screen.queryByText('Test Modal')).not.toBeInTheDocument();
+    expect(screen.queryByText('Modal Content')).not.toBeInTheDocument();
+  });
+
+  it('should render with custom maxWidth and maxHeight', () => {
+    render(
+      <BaseModal 
+        {...defaultProps} 
+        maxWidth="sm:max-w-[800px]" 
+        maxHeight="max-h-[80vh]" 
+      />
+    );
+
+    const modalContent = screen.getByTestId('modal-content');
+    expect(modalContent).toHaveClass('sm:max-w-[800px]');
+    expect(modalContent).toHaveClass('max-h-[80vh]');
+  });
+
+  it('should render with description when provided', () => {
+    render(
+      <BaseModal 
+        {...defaultProps} 
+        description="Test description" 
+      />
+    );
+
+    expect(screen.getByText('Test description')).toBeInTheDocument();
+  });
+
+  it('should render footer when provided', () => {
+    const footer = <button>Save</button>;
+    render(<BaseModal {...defaultProps} footer={footer} />);
+
+    expect(screen.getByText('Save')).toBeInTheDocument();
+  });
+});
diff --git a/src/__tests__/lib/utils.test.ts b/src/__tests__/lib/utils.test.ts
new file mode 100644
index 0000000..373abff
--- /dev/null
+++ b/src/__tests__/lib/utils.test.ts
@@ -0,0 +1,120 @@
+import { 
+  generateSlug, 
+  generateShortId, 
+  formatCurrency, 
+  formatDate,
+  validateEmail,
+  sanitizeHtml
+} from '../../lib/utils';
+
+describe('Utils Module', () => {
+  describe('generateSlug', () => {
+    it('should generate valid slug from title', () => {
+      const title = 'Test Campaign Title';
+      const slug = generateSlug(title);
+      
+      expect(slug).toBe('test-campaign-title');
+    });
+
+    it('should handle special characters', () => {
+      const title = 'Campagne avec des caractères spéciaux @#$%';
+      const slug = generateSlug(title);
+      
+      expect(slug).toBe('campagne-avec-des-caracteres-speciaux-');
+    });
+
+    it('should handle empty string', () => {
+      const slug = generateSlug('');
+      expect(slug).toBe('');
+    });
+
+    it('should handle multiple spaces', () => {
+      const title = 'Multiple    Spaces';
+      const slug = generateSlug(title);
+      
+      expect(slug).toBe('multiple-spaces');
+    });
+  });
+
+  describe('generateShortId', () => {
+    it('should generate short ID with correct length', () => {
+      const shortId = generateShortId();
+      
+      expect(shortId).toHaveLength(8);
+      expect(shortId).toMatch(/^[A-Z0-9]+$/);
+    });
+
+    it('should generate different IDs', () => {
+      const id1 = generateShortId();
+      const id2 = generateShortId();
+      
+      expect(id1).not.toBe(id2);
+    });
+  });
+
+  describe('formatCurrency', () => {
+    it('should format currency correctly', () => {
+      const result1 = formatCurrency(1000);
+      const result2 = formatCurrency(1234.56);
+      const result3 = formatCurrency(0);
+      
+      expect(result1).toMatch(/1\s*000,00\s*€/);
+      expect(result2).toMatch(/1\s*234,56\s*€/);
+      expect(result3).toMatch(/0,00\s*€/);
+    });
+
+    it('should handle negative values', () => {
+      const result = formatCurrency(-1000);
+      expect(result).toMatch(/-1\s*000,00\s*€/);
+    });
+  });
+
+  describe('formatDate', () => {
+    it('should format date correctly', () => {
+      const date = new Date('2024-01-15T10:30:00');
+      const formatted = formatDate(date);
+      
+      expect(formatted).toBe('15/01/2024');
+    });
+
+    it('should handle string date', () => {
+      const formatted = formatDate('2024-01-15');
+      expect(formatted).toBe('15/01/2024');
+    });
+  });
+
+  describe('validateEmail', () => {
+    it('should validate correct email addresses', () => {
+      expect(validateEmail('test@example.com')).toBe(true);
+      expect(validateEmail('user.name+tag@domain.co.uk')).toBe(true);
+      expect(validateEmail('123@test.org')).toBe(true);
+    });
+
+    it('should reject invalid email addresses', () => {
+      expect(validateEmail('invalid-email')).toBe(false);
+      expect(validateEmail('test@')).toBe(false);
+      expect(validateEmail('@example.com')).toBe(false);
+      expect(validateEmail('')).toBe(false);
+    });
+  });
+
+  describe('sanitizeHtml', () => {
+    it('should remove dangerous HTML tags', () => {
+      const input = '<script>alert("xss")</script><p>Safe content</p>';
+      const sanitized = sanitizeHtml(input);
+      
+      expect(sanitized).toBe('<p>Safe content</p>');
+    });
+
+    it('should allow safe HTML tags', () => {
+      const input = '<p>Paragraph</p><strong>Bold</strong><em>Italic</em>';
+      const sanitized = sanitizeHtml(input);
+      
+      expect(sanitized).toBe(input);
+    });
+
+    it('should handle empty string', () => {
+      expect(sanitizeHtml('')).toBe('');
+    });
+  });
+});
diff --git a/src/components/base/BaseModal.tsx b/src/components/base/BaseModal.tsx
index 0d59e77..286c875 100644
--- a/src/components/base/BaseModal.tsx
+++ b/src/components/base/BaseModal.tsx
@@ -24,7 +24,10 @@ export function BaseModal({
 }: BaseModalProps) {
   return (
     <Dialog open={isOpen} onOpenChange={onClose}>
-      <DialogContent className={`${maxWidth} ${maxHeight} overflow-y-auto`}>
+      <DialogContent 
+        className={`${maxWidth} ${maxHeight} overflow-y-auto`}
+        data-testid="modal-content"
+      >
         <DialogHeader>
           <DialogTitle>{title}</DialogTitle>
           {description && <DialogDescription>{description}</DialogDescription>}
diff --git a/src/lib/utils.ts b/src/lib/utils.ts
index 43ccc09..b25b6bf 100644
--- a/src/lib/utils.ts
+++ b/src/lib/utils.ts
@@ -43,3 +43,63 @@ export function parseFooterMessage(message: string, repositoryUrl: string): { te
   
   return { text: processedText, links };
 }
+
+/**
+ * Génère un slug à partir d'un titre
+ */
+export function generateSlug(title: string): string {
+  return title
+    .toLowerCase()
+    .normalize('NFD')
+    .replace(/[\u0300-\u036f]/g, '') // Supprime les accents
+    .replace(/[^a-z0-9\s-]/g, '') // Garde seulement lettres, chiffres, espaces et tirets
+    .replace(/\s+/g, '-') // Remplace les espaces par des tirets
+    .replace(/-+/g, '-') // Remplace les tirets multiples par un seul
+    .trim();
+}
+
+/**
+ * Génère un ID court aléatoire
+ */
+export function generateShortId(): string {
+  const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
+  let result = '';
+  for (let i = 0; i < 8; i++) {
+    result += chars.charAt(Math.floor(Math.random() * chars.length));
+  }
+  return result;
+}
+
+/**
+ * Formate un montant en euros
+ */
+export function formatCurrency(amount: number): string {
+  return new Intl.NumberFormat('fr-FR', {
+    style: 'currency',
+    currency: 'EUR',
+  }).format(amount);
+}
+
+/**
+ * Formate une date
+ */
+export function formatDate(date: Date | string): string {
+  const dateObj = typeof date === 'string' ? new Date(date) : date;
+  return dateObj.toLocaleDateString('fr-FR');
+}
+
+/**
+ * Valide une adresse email
+ */
+export function validateEmail(email: string): boolean {
+  const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
+  return emailRegex.test(email);
+}
+
+/**
+ * Nettoie le HTML pour éviter les attaques XSS
+ */
+export function sanitizeHtml(html: string): string {
+  // Supprime les balises dangereuses
+  return html.replace(/<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi, '');
+}