public async Task ExecuteAsync_WhenCalled_AssertToDomainWasCalledOnCommand()
        {
            CommandHandler sut = CreateSut();

            Mock <ICreateContactGroupCommand> commandMock = CreateCommandMock();
            await sut.ExecuteAsync(commandMock.Object);

            commandMock.Verify(m => m.ToDomain(), Times.Once);
        }
        public async Task ExecuteAsync_WhenCalled_AssertCreateContactGroupAsyncWasCalledOnContactRepository()
        {
            CommandHandler sut = CreateSut();

            IContactGroup contactGroup         = _fixture.BuildContactGroupMock().Object;
            ICreateContactGroupCommand command = CreateCommandMock(contactGroup).Object;
            await sut.ExecuteAsync(command);

            _contactRepositoryMock.Verify(m => m.CreateContactGroupAsync(It.Is <IContactGroup>(value => value == contactGroup)), Times.Once);
        }