test: add test case

Author: zombieJ

src/Step.tsx

@@ -157,7 +157,7 @@ export default function Step(props: StepProps) {
         </div>
         {mergedContent && (
           <div
-            className={cls(`${itemCls}-description`, classNames.itemContent)}
+            className={cls(`${itemCls}-content`, classNames.itemContent)}
             style={styles.itemContent}
           >
             {mergedContent}

src/index.ts

@@ -1,5 +1,6 @@
-import Steps from './Steps';
+import Steps, { type StepsProps } from './Steps';
 import Step from './Step';
 
 export { Step };
+export type { StepsProps };
 export default Steps;