Update RawExample.js

Author: ealush

website/src/components/RawExample.js

@@ -20,7 +20,11 @@ test("username", "Username is required", () => {
 });
 
 test("username", "Username must be at least 3 chars", () => {
-  enforce(data.username).longerThanOrEquals(3)
+  enforce(data.username).longerThanOrEquals(3);
+});
+
+test('username', 'Username already taken', async () => {
+  await doesUserExist(data.username);
 });
 `}</CodeBlock>
     </section>