Add stories for login.

packages/ra-ui-materialui/src/auth/Login.stories.tsx

@@ -0,0 +1,33 @@
+import * as React from 'react';
+import AccountBoxIcon from '@mui/icons-material/AccountBox';
+import { AdminContext } from '../AdminContext';
+import { Login } from './Login';
+
+export default { title: 'ra-ui-materialui/auth/Login' };
+
+export const DefaultLogin = () => {
+    return (
+        <Wrapper>
+            <Login />
+        </Wrapper>
+    );
+};
+
+export const CustomIcon = () => {
+    return (
+        <Wrapper>
+            <Login avatarIcon={<AccountBoxIcon />} />
+        </Wrapper>
+    );
+};
+
+const Wrapper = ({ children }) => {
+    const authProvider = {
+        login: () => Promise.resolve(),
+        logout: () => Promise.resolve(),
+        checkAuth: () => Promise.reject(),
+        checkError: () => Promise.resolve(),
+        getPermissions: () => Promise.resolve(),
+    };
+    return <AdminContext authProvider={authProvider}>{children}</AdminContext>;
+};