Test the usage of ownerState in customized slots

packages/mui-base/src/InputUnstyled/InputUnstyled.spec.tsx

@@ -0,0 +1,23 @@
+import * as React from 'react';
+import InputUnstyled, {
+  InputUnstyledInputSlotProps,
+  InputUnstyledRootSlotProps,
+} from '@mui/base/InputUnstyled';
+
+const InputRoot = React.forwardRef(function InputRoot(
+  props: InputUnstyledRootSlotProps,
+  ref: React.Ref<HTMLDivElement>,
+) {
+  const { ownerState, ...other } = props;
+  return <div data-focused={ownerState.focused} {...other} ref={ref} />;
+});
+
+const InputInput = React.forwardRef(function InputInput(
+  props: InputUnstyledInputSlotProps,
+  ref: React.Ref<HTMLInputElement>,
+) {
+  const { ownerState, ...other } = props;
+  return <input data-focused={ownerState.focused} {...other} ref={ref} />;
+});
+
+const styledInput = <InputUnstyled components={{ Root: InputRoot, Input: InputInput }} />;