diff --git a/src/__tests__/client.test.ts b/src/__tests__/client.test.ts
new file mode 100644
index 0000000..5ca8261
--- /dev/null
+++ b/src/__tests__/client.test.ts
@@ -0,0 +1,26 @@
+import { describe, it, expect } from 'vitest';
+import { OrbitStream } from '../client';
+
+describe('OrbitStream', () => {
+  it('should be defined', () => {
+    expect(OrbitStream).toBeDefined();
+  });
+
+  it('should create client with empty API key', () => {
+    const client = new OrbitStream({ apiKey: '' });
+    expect(client).toBeDefined();
+  });
+
+  it('should create client with default baseUrl', () => {
+    const client = new OrbitStream({ apiKey: 'sk_test_123' });
+    expect(client).toBeDefined();
+  });
+
+  it('should create client with custom baseUrl', () => {
+    const client = new OrbitStream({
+      apiKey: 'sk_test_123',
+      baseUrl: 'http://localhost:3001',
+    });
+    expect(client).toBeDefined();
+  });
+});