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

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

            commandMock.Verify(m => m.ToDomain(It.Is <IAccountingRepository>(value => value == _accountingRepositoryMock.Object)), Times.Once);
        }
        public async Task ExecuteAsync_WhenCalled_AssertUpdateAccountAsyncWasCalledOnAccountingRepository()
        {
            CommandHandler sut = CreateSut();

            IAccount account = _fixture.BuildAccountMock().Object;
            IUpdateAccountCommand command = CreateCommand(account);
            await sut.ExecuteAsync(command);

            _accountingRepositoryMock.Verify(m => m.UpdateAccountAsync(It.Is <IAccount>(value => value == account)), Times.Once);
        }
        public void ExecuteAsync_WhenCommandIsNull_ThrowsArgumentNullException()
        {
            CommandHandler sut = CreateSut();

            ArgumentNullException result = Assert.ThrowsAsync <ArgumentNullException>(async() => await sut.ExecuteAsync(null));

            Assert.That(result.ParamName, Is.EqualTo("command"));
        }