diff --git a/Tests/LibMatrix.HomeserverEmulator/Services/UserStore.cs b/Tests/LibMatrix.HomeserverEmulator/Services/UserStore.cs
new file mode 100644
index 0000000..ca1c577
--- /dev/null
+++ b/Tests/LibMatrix.HomeserverEmulator/Services/UserStore.cs
@@ -0,0 +1,72 @@
+using LibMatrix.EventTypes.Spec.State;
+
+namespace LibMatrix.HomeserverEmulator.Services;
+
+public class UserStore(RoomStore roomStore) {
+ public List<User> _users = new();
+ private Dictionary<string, User> _usersById = new();
+ private Dictionary<string, User> _usersByToken = new();
+
+ private void RebuildIndexes() {
+ _usersById = _users.ToDictionary(u => u.UserId);
+ _usersByToken = _users.ToDictionary(u => u.AccessToken);
+ }
+
+ public async Task<User?> GetUserById(string userId, bool createIfNotExists = false) {
+ if (_usersById.TryGetValue(userId, out var user)) {
+ return user;
+ }
+
+ if (!createIfNotExists)
+ return null;
+
+ return await CreateUser(userId, Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), new Dictionary<string, object>());
+ }
+
+ public async Task<User?> GetUserByToken(string token, bool createIfNotExists = false, string? serverName = null) {
+ if (_usersByToken.TryGetValue(token, out var user)) {
+ return user;
+ }
+
+ if (!createIfNotExists)
+ return null;
+ if (string.IsNullOrWhiteSpace(serverName)) throw new NullReferenceException("Server name was not passed");
+ var uid = $"@{Guid.NewGuid().ToString()}:{serverName}";
+ return await CreateUser(uid, Guid.NewGuid().ToString(), token, new Dictionary<string, object>());
+ }
+
+ public async Task<User> CreateUser(string userId, string deviceId, string accessToken, Dictionary<string, object> profile) {
+ if (!profile.ContainsKey("displayname")) profile.Add("displayname", userId.Split(":")[0]);
+ if (!profile.ContainsKey("avatar_url")) profile.Add("avatar_url", null);
+ var user = new User {
+ UserId = userId,
+ DeviceId = deviceId,
+ AccessToken = accessToken,
+ Profile = profile
+ };
+ _users.Add(user);
+ RebuildIndexes();
+
+ if (roomStore._rooms.Count > 0)
+ foreach (var item in Random.Shared.GetItems(roomStore._rooms.ToArray(), Math.Min(roomStore._rooms.Count, 400))) {
+ item.AddUser(userId);
+ }
+
+ int random = Random.Shared.Next(10);
+ for (int i = 0; i < random; i++) {
+ var room = roomStore.CreateRoom(new());
+ room.AddUser(userId);
+ }
+
+ return user;
+ }
+
+ public class User {
+ public string UserId { get; set; }
+ public string AccessToken { get; set; }
+ public string DeviceId { get; set; }
+ public Dictionary<string, object> Profile { get; set; }
+
+ public List<string> JoinedRooms { get; set; } = new();
+ }
+}
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