public async Task WhenGetConversationParticipantsGetsCalled()
{
Setup();
_conversationParticipants = new Fixture().CreateMany <ConversationParticipant>().ToList();
ConversationsRepository.Setup(repository =>
repository.GetConversationParticipantsByConversationId(It.IsAny <Guid>()))
.ReturnsAsync(_conversationParticipants);
_participantIds = await ConversationsService.GetConversationParticipants(_conversationId);
}