diff --git a/components/ShareButtons.test.tsx b/components/ShareButtons.test.tsx
new file mode 100644
index 00000000..40cd8ba0
--- /dev/null
+++ b/components/ShareButtons.test.tsx
@@ -0,0 +1,57 @@
+import { render, screen } from '@testing-library/react';
+import '@testing-library/jest-dom/vitest';
+import { describe, it, expect } from 'vitest';
+import ShareButtons from './ShareButtons';
+
+const TEST_URL = 'https://commitpulse.vercel.app/dashboard/testuser';
+const TEST_TITLE = 'Check out my CommitPulse streak!';
+
+describe('ShareButtons', () => {
+  it('renders LinkedIn and Twitter share buttons', () => {
+    render(<ShareButtons url={TEST_URL} />);
+
+    expect(screen.getByRole('link', { name: /linkedin/i })).toBeInTheDocument();
+    expect(screen.getByRole('link', { name: /twitter/i })).toBeInTheDocument();
+  });
+
+  it('LinkedIn share link contains correctly encoded URL', () => {
+    render(<ShareButtons url={TEST_URL} />);
+
+    const linkedin = screen.getByRole('link', { name: /linkedin/i });
+    expect(linkedin).toHaveAttribute(
+      'href',
+      `https://www.linkedin.com/sharing/share-offsite/?url=${encodeURIComponent(TEST_URL)}`
+    );
+  });
+
+  it('Twitter share link contains correctly encoded URL and title', () => {
+    render(<ShareButtons url={TEST_URL} title={TEST_TITLE} />);
+
+    const twitter = screen.getByRole('link', { name: /twitter/i });
+    const expected =
+      `https://x.com/intent/tweet?url=${encodeURIComponent(TEST_URL)}` +
+      `&text=${encodeURIComponent(TEST_TITLE)}`;
+    expect(twitter).toHaveAttribute('href', expected);
+  });
+
+  it('Twitter share link omits text parameter when title is not provided', () => {
+    render(<ShareButtons url={TEST_URL} />);
+
+    const twitter = screen.getByRole('link', { name: /twitter/i });
+    expect(twitter).toHaveAttribute(
+      'href',
+      `https://x.com/intent/tweet?url=${encodeURIComponent(TEST_URL)}`
+    );
+    expect(twitter.getAttribute('href')).not.toContain('&text=');
+  });
+
+  it('sets target="_blank" and rel="noopener noreferrer" on all share links', () => {
+    render(<ShareButtons url={TEST_URL} />);
+
+    const links = screen.getAllByRole('link');
+    links.forEach((link) => {
+      expect(link).toHaveAttribute('target', '_blank');
+      expect(link).toHaveAttribute('rel', 'noopener noreferrer');
+    });
+  });
+});