public async Task RemoveMessageFromUser()
{
var options = new DbContextOptionsBuilder <ApplicationDbContext>()
.UseInMemoryDatabase(databaseName: "RemoveMessageFromUser_Database")
.Options;
var dbContext = new ApplicationDbContext(options);
var messageService = new MessageService(dbContext);
await messageService.AddMessageToUserAsync("Message1", "u1", null);
await messageService.AddMessageToUserAsync("Message2", "u2", null);
await messageService.MakeAllMessagesOld("u1");
await messageService.RemoveMessageFromUserAsync(1, "u1");
var messagesCount = await dbContext.Messages.CountAsync();
var message = await dbContext.Messages.FirstAsync();
Assert.Equal(2, message.Id);
Assert.Equal("Message2", message.Content);
Assert.Equal("u2", message.UserId);
Assert.True(message.IsNew);
Assert.Equal(1, messagesCount);
}