public async Task GIVEN_no_invoice_with_id_WHEN_InvoiceExists_THEN_return_false(Guid invoiceId)
        {
            A.CallTo(() => _dbContext.Invoices).Returns(ContainerFactory.FakeContainer(new InvoiceState[0]));

            var invoiceExists = await _sut.InvoiceExists(invoiceId);

            Assert.False(invoiceExists);
        }