public async Task WhenThereIsNoBaselineYet_AndThereAreNoSteps_RunsZero()
            {
                A.CallTo(() => _baseliner.GetBaseline())
                .Returns(Task.FromResult <int?>(null));

                var sut = new ClientStoreMigrator(Enumerable.Empty <IClientStoreMigrationStep>(), _baseliner);

                var actual = await sut.Migrate();

                actual.Should().Be(0);
            }