public async Task GetByIds()
        {
            var parent1 = ParentGenerator.Generate();

            parent1 = await _parentRepository.AddAsync(parent1, o => o.ImmediateConsistency());

            Assert.NotNull(parent1?.Id);

            var child1 = ChildGenerator.Generate(parentId: parent1.Id);

            child1 = await _childRepository.AddAsync(child1, o => o.ImmediateConsistency());

            Assert.NotNull(child1?.Id);

            var parent2 = ParentGenerator.Generate();

            parent2 = await _parentRepository.AddAsync(parent2, o => o.ImmediateConsistency());

            Assert.NotNull(parent2?.Id);

            var child2 = ChildGenerator.Generate(parentId: parent2.Id);

            child2 = await _childRepository.AddAsync(child2, o => o.ImmediateConsistency());

            Assert.NotNull(child2?.Id);

            var ids = new Ids(child1.Id, child2.Id);

            var results = await _childRepository.GetByIdsAsync(ids);

            Assert.NotNull(results);
            Assert.Equal(2, results.Count);

            var idsWithRouting = new Ids(new Id(child1.Id, parent1.Id), new Id(child2.Id, parent2.Id));

            var resultsWithRouting = await _childRepository.GetByIdsAsync(idsWithRouting);

            Assert.NotNull(resultsWithRouting);
            Assert.Equal(2, resultsWithRouting.Count);
        }