diff --git a/libs/client-api/src/http.rs b/libs/client-api/src/http.rs
index d7ea08b7..538042b9 100644
--- a/libs/client-api/src/http.rs
+++ b/libs/client-api/src/http.rs
@@ -408,20 +408,32 @@ impl Client {
     email: &str,
     password: &str,
   ) -> Result<User, AppResponseError> {
-    Ok(
-      self
-        .gotrue_client
-        .admin_add_user(
-          &self.access_token()?,
-          &AdminUserParams {
-            email: email.to_owned(),
-            password: Some(password.to_owned()),
-            email_confirm: true,
-            ..Default::default()
-          },
-        )
-        .await?,
-    )
+    let user = self
+      .gotrue_client
+      .admin_add_user(
+        &self.access_token()?,
+        &AdminUserParams {
+          email: email.to_owned(),
+          password: Some(password.to_owned()),
+          email_confirm: true,
+          ..Default::default()
+        },
+      )
+      .await?;
+    Ok(user)
+  }
+
+  // filter is postgre sql like filter
+  #[instrument(level = "debug", skip_all, err)]
+  pub async fn admin_list_users(
+    &self,
+    filter: Option<&str>,
+  ) -> Result<Vec<User>, AppResponseError> {
+    let user = self
+      .gotrue_client
+      .admin_list_user(&self.access_token()?, filter)
+      .await?;
+    Ok(user.users)
   }
 
   /// Only expose this method for testing
diff --git a/tests/workspace/member_crud.rs b/tests/workspace/member_crud.rs
index 7a4b599c..7ad8f3fa 100644
--- a/tests/workspace/member_crud.rs
+++ b/tests/workspace/member_crud.rs
@@ -1,5 +1,5 @@
 use app_error::ErrorCode;
-use client_api_test_util::TestClient;
+use client_api_test_util::{admin_user_client, TestClient};
 use database_entity::dto::AFRole;
 use shared_entity::dto::workspace_dto::CreateWorkspaceMember;
 
@@ -253,3 +253,34 @@ async fn get_user_workspace_info_after_open_workspace() {
     workspace_id_c1
   );
 }
+
+#[tokio::test]
+async fn add_workspace_member_not_exists() {
+  let c1 = TestClient::new_user_without_ws_conn().await;
+  let workspace_id_c1 = c1.workspace_id().await;
+  let non_exist_email = format!("{}@appflowy.io", uuid::Uuid::new_v4());
+  c1.api_client
+    .add_workspace_members(
+      &workspace_id_c1,
+      vec![CreateWorkspaceMember {
+        email: non_exist_email.clone(),
+        role: AFRole::Member,
+      }],
+    )
+    .await
+    .expect("should be able to add member whose email not exists yet");
+
+  let admin_client = admin_user_client().await;
+  let users = admin_client
+    .admin_list_users(Some(&non_exist_email))
+    .await
+    .expect("should be able to list users");
+  println!("---------non_exist_email: {}", non_exist_email);
+  let non_exist_user = users
+    .iter()
+    .find(|u| u.email == non_exist_email)
+    .expect("should find the user");
+
+  // since user does not exist and is just created, it should not be confirmed yet
+  assert!(non_exist_user.confirmed_at.is_none());
+}