test: add open login modal test

packages/app/src/components/login-modal/index.tsx

@@ -11,7 +11,7 @@ interface LoginModalProps {
 
 export const LoginModal = ({ open, onClose }: LoginModalProps) => {
   return (
-    <Modal open={open} onClose={onClose}>
+    <Modal open={open} onClose={onClose} data-testid="login-modal">
       <ModalWrapper width={620} height={334}>
         <Header>
           <ModalCloseButton

packages/app/src/components/workspace-slider-bar/WorkspaceSelector/WorkspaceItem/LoginItem.tsx

@@ -9,7 +9,10 @@ import {
 export const LoginItem = () => {
   const { triggerLoginModal } = useModal();
   return (
-    <LoginItemWrapper onClick={() => triggerLoginModal()}>
+    <LoginItemWrapper
+      onClick={() => triggerLoginModal()}
+      data-testid="open-login-modal"
+    >
       <WorkspaceItemAvatar alt="AFFiNE" src={''}>
         A
       </WorkspaceItemAvatar>