public void Should_remove_all_messages_from_hearing()
{
var conference = new ConferenceBuilder()
.WithMessages(5)
.Build();
var beforeCount = conference.GetInstantMessageHistory().Count;
//Act
conference.ClearInstantMessageHistory();
//Assert
var afterCount = conference.GetInstantMessageHistory().Count;
afterCount.Should().BeLessThan(beforeCount);
afterCount.Should().Be(0);
}