[英]NSubstitute DateTime.Now() How can I get the DateTime.Now() to return an ever increasing date and time?
I have several unit tests in which we use NSubstitute for the DateTime.我有几个单元测试,我们使用 NSubstitute 作为 DateTime。 In some cases I want to increment the DateTime.Now() by some set amount so that each time it is called, the date and time are incremented a little.
在某些情况下,我想将 DateTime.Now() 增加一些设置量,以便每次调用它时,日期和时间都会增加一点。 Currently I have:
目前我有:
private int minutesToAdd = 1;
private DateTime dateToUse = new DateTime(2018, 1, 1, 0, 0, 0);
DateTime = Substitute.For<IDateTime>();
DateTime.Now().Returns(dateToUse.AddMinutes(minutesToAdd)).AndDoes(x => minutesToAdd++) ;
This returns 1/1/2/2018 00:01 every time the function is called.每次调用 function 时都会返回 1/1/2/2018 00:01。
I thought the "AndDoes" would increment the minutesToAdd each time and would increase the time by one minute.我认为“AndDoes”每次都会增加 minutesToAdd 并将时间增加一分钟。
Can I get the DateTime substitute to increment by one minute each time it is called?我可以让 DateTime 替代品每次被调用时增加一分钟吗?
There should be an overload of Returns()
that accepts a Func<,>
, try it:应该有一个接受
Func<,>
的Returns()
重载,试试看:
var DateTime = Substitute.For<IDateTime>();
DateTime.Now().Returns(x =>
{
var dt = dateToUse.AddMinutes(minutesToAdd);
minutesToAdd++;
return dt;
});
note that you could one-line the Returns()
, but I always thought that unncessarily using pre or post increments is unreadable:请注意,您可以单行
Returns()
,但我一直认为不必要地使用前置或后置增量是不可读的:
DateTime.Now().Returns(x => dateToUse.AddMinutes(minutesToAdd++));
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