public async Task CreateAsync_ExistingTags_RelationAdded()
        {
            //arrange
            var expected = _fixture.Create<Printer>();

            const string printerName = "TestName";
            const string printerNetworkName = "TestNetworkName";

            var tagsToCreate = new List<string>

                               {
                                   "FirstTag",
                                   "SecondTag"
                               };

            var user = new UserInfo(1,
                                    "UserName",
                                    "Name",
                                    "FirstName",
                                    "LastName",
                                    "Email",
                                    false);

            var model = new PrinterCreateModel(printerName,
                                               printerNetworkName,
                                               tagsToCreate,
                                               user);

            var expectedFirstTagId = Guid.Parse("80B003D8-3E3B-46F2-BBE1-3B3FFFB32477");
            var expectedSecondTagId = Guid.Parse("ee9c7c3d-297d-4744-9c5e-8b1e33404392");

            var expectedUtcNow = new DateTimeOffset(2019,
                                                    8,
                                                    20,
                                                    11,
                                                    45,
                                                    0,
                                                    TimeSpan.Zero);

            var existsTags = new List<Tag>
                             {
                                 new Tag(expectedSecondTagId,
                                         "SecondTag",
                                         expectedUtcNow,
                                         user),
                             };

            var expectedMapsToAdd = new List<PrinterTagMap>
                                    {
                                        new PrinterTagMap(expected.Id, expectedFirstTagId),
                                        new PrinterTagMap(expected.Id, expectedSecondTagId)
                                    };

            _guidProviderMock.Setup(p => p.GenerateNewGuid()).Returns(expectedFirstTagId);

            _dateTimeProviderMock.Setup(p => p.GetUtcNow()).Returns(expectedUtcNow);

            _printerRepositoryMock.Setup(x => x.AddAsync(model))
                                  .Returns(new AddedEntry<Printer, Guid>(expected, s => s.Id));

            _tagsRepositoryMock.Setup(x => x.GetByNamesAsync(model.Tags)).ReturnsAsync(existsTags);

            //act
            await _printerService.CreateAsync(model);

            //assert
            _printerTagsMapRepositoryMock.Verify(r => r.Add(It.Is<IReadOnlyList<PrinterTagMap>>(maps => maps.IsDeepEqual(expectedMapsToAdd))));
        }