init project

test/regressions/fixtures/Alert/HorizontalOverflow.js

@@ -0,0 +1,21 @@
+import * as React from 'react';
+import Button from '@mui/material/Button';
+import Typography from '@mui/material/Typography';
+import Alert from '@mui/material/Alert';
+import { Box } from '@mui/material';
+
+export default function MultilineAlertWithAction() {
+  return (
+    <Box sx={{ width: 500 }}>
+      <Alert
+        action={
+          <Button color="inherit" size="small">
+            UNDO
+          </Button>
+        }
+      >
+        <Typography as="div">{'a'.repeat(500)}</Typography>
+      </Alert>
+    </Box>
+  );
+}

test/regressions/fixtures/Alert/MultilineAlertWithAction.js

@@ -0,0 +1,19 @@
+import * as React from 'react';
+import Button from '@mui/material/Button';
+import Typography from '@mui/material/Typography';
+import Alert from '@mui/material/Alert';
+
+export default function MultilineAlertWithAction() {
+  return (
+    <Alert
+      action={
+        <Button color="inherit" size="small">
+          UNDO
+        </Button>
+      }
+    >
+      <Typography as="div">This is the first line.</Typography>
+      <Typography as="div">This is the second line.</Typography>
+    </Alert>
+  );
+}