public async Task indicates_whether_activator_is_not_active()
        {
            var activator = new FromToActivatorBuilder()
                            .WithReleaseDates(DateTime.UtcNow.AddDays(-2), DateTime.UtcNow.AddDays(-1), format: "yyyy/MM/dd")
                            .Build();

            (await activator.IsActiveAsync("some_feature")).Should().Be(false);
        }
        public async Task use_dates_with_different_formats()
        {
            var activator = new FromToActivatorBuilder()
                            .WithReleaseDates(DateTime.UtcNow.AddDays(-1), DateTime.UtcNow.AddDays(1), format: "yyyy/MM/dd")
                            .Build();

            (await activator.IsActiveAsync("some_feature")).Should().Be(true);

            activator = new FromToActivatorBuilder()
                        .WithReleaseDates(DateTime.UtcNow.AddDays(-2), DateTime.UtcNow.AddDays(-1), format: "yyyy/MM/dd")
                        .Build();

            (await activator.IsActiveAsync("some_feature")).Should().Be(false);
        }