public async Task ShouldMakeUserParticipantInChat()
{
var dbContext = InfrastructureFactory.GetInMemoryContext(nameof(ShouldMakeUserParticipantInChat));
var unitOfWork = InfrastructureFactory.GetEfUnitOfWork(dbContext);
await unitOfWork.AddAndSaveAsync(EntityFactory.GetUser("johndoe", "Pass@123"));
await unitOfWork.AddAndSaveAsync(EntityFactory.GetUser("admin", "Pass@123"));
await unitOfWork.AddAndSaveAsync(EntityFactory.GetChat("foo", "admin"));
var mediator = InfrastructureFactory.GetMediatorSubstitute();
var handler = new JoinChatCommandHandler(unitOfWork, mediator, InfrastructureFactory.GetMachineDateTime());
await handler.Handle(new JoinChatCommand("johndoe", "foo"), default);
var pars = await unitOfWork.FetchAsync <ChatParticipantEntity, ChatParticipant>(
participants =>
participants.Where(p => p.Stock == "foo"));
Assert.AreEqual(1, pars.Count());
Assert.AreEqual("johndoe", pars.First().Nickname);
}