public void GetPastDateTime_ReturnSoonDateTime()
{
var mockDateTimeHelper = new Mock <IDateTimeHelper>();
var fakeDate = new DateTime(2000, 1, 1);
mockDateTimeHelper.Setup(o => o.GetDateTimeNow())
.Returns(fakeDate);
((FakerGenerator)generator).DateTimeHelper.Value = mockDateTimeHelper.Object;
var soon = generator.Past();
soon.Should().BeBefore(fakeDate);
}