diff --git a/src/compat/string/capitalize.spec.ts b/src/compat/string/capitalize.spec.ts
new file mode 100644
index 00000000..03f7a4c1
--- /dev/null
+++ b/src/compat/string/capitalize.spec.ts
@@ -0,0 +1,10 @@
+import { describe, it, expect } from 'vitest';
+import { capitalize } from '../../string/capitalize';
+
+describe('capitalize', () => {
+  it('should capitalize the first character of a string', () => {
+    expect(capitalize('fred')).toBe('Fred');
+    expect(capitalize('Fred')).toBe('Fred');
+    expect(capitalize(' fred')).toBe(' fred');
+  });
+});