DocumentOrganizer/Diligent.WebAPI.Tests/Services/ImportServiceTests.cs

using Diligent.WebAPI.Business.Services;
using Diligent.WebAPI.Contracts.DTOs.Applicant;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;

namespace Diligent.WebAPI.Tests.Services
{
    public class ImportServiceTests
    {
        private readonly List<ApplicantImportDto> _applicantImportDtos;
        private readonly ILogger<ImportService> _logger = Substitute.For<ILogger<ImportService>>();
        private readonly ISaveImportedDataService _service = Substitute.For<ISaveImportedDataService>();
        private readonly IFormFile file = Substitute.For<IFormFile>();
        public ImportServiceTests()
        {
            _applicantImportDtos = new List<ApplicantImportDto>
            {
                new ApplicantImportDto{ Email = "dzenis@dilig.net" },
                new ApplicantImportDto{ Email = "meris@dilig.net" },
                new ApplicantImportDto{ Email = "ermin@dilig.net" }
            };
        }

        [Fact]
        public async Task TesImport_ShouldHaveThreeItems_WhenISaveImportedDataServiceReturnsThreeItems()
        {
            ImportService importService = new ImportService(_logger, _service);
            _service.Save().Returns(_applicantImportDtos);

            var result = await importService.Import(file);

            result.Should().HaveCount(3);
        }

        [Fact]
        public async Task TesImport_ShouldThrowsException_WhenErrorIsPresent()
        {
            ImportService importService = new ImportService(_logger, _service);
            _service.When(x => x.Save()).Do(x => { throw new Exception(); });

            await Assert.ThrowsAsync<Exception>(async () => await importService.Import(file));
        }
    }
}