react-test/docs/data/material/components/alert/BasicAlerts.js

import Alert from '@mui/material/Alert';
import Stack from '@mui/material/Stack';

export default function BasicAlerts() {
  return (
    <Stack sx={{ width: '100%' }} spacing={2}>
      <Alert severity="success">This is a success Alert.</Alert>
      <Alert severity="info">This is an info Alert.</Alert>
      <Alert severity="warning">This is a warning Alert.</Alert>
      <Alert severity="error">This is an error Alert.</Alert>
    </Stack>
  );
}