diff --git a/mobile/src/api/config.test.ts b/mobile/src/api/config.test.ts
new file mode 100644
index 0000000..6fff1a7
--- /dev/null
+++ b/mobile/src/api/config.test.ts
@@ -0,0 +1,22 @@
+import { describe, expect, it } from 'vitest';
+import { PRODUCT_ID, PRODUCT_NAME, API_CONFIG } from './config';
+
+describe('mobile API config', () => {
+  it('exports correct product identity', () => {
+    expect(PRODUCT_ID).toBe('notelett');
+    expect(PRODUCT_NAME).toBe('NoteLett');
+  });
+
+  it('API_CONFIG has expected shape', () => {
+    expect(API_CONFIG.productId).toBe('notelett');
+    expect(API_CONFIG.timeoutMs).toBe(15000);
+    expect(typeof API_CONFIG.platformBaseUrl).toBe('string');
+    expect(typeof API_CONFIG.productBaseUrl).toBe('string');
+  });
+
+  it('default URLs point to localhost', () => {
+    expect(API_CONFIG.platformBaseUrl).toContain('localhost');
+    expect(API_CONFIG.productBaseUrl).toContain('localhost');
+    expect(API_CONFIG.productBaseUrl).toContain('4016');
+  });
+});