Comments on: Tests should last forever

By: Tigraine » Blog Archive » Beggars can’t be choosers: Dependency injection through global factories

Wed, 14 Oct 2009 16:34:49 +0000

[...] Oh, and btw: The example I did above was chosen deliberately to be something as simple as a abstraction of DateTime.Now. As said before, never depend on moving parts in your tests. [...]

By: Tigraine

Tigraine — Thu, 26 Mar 2009 22:35:39 +0000

The whole point of the posting was that if you initialize a variable in your test to DateTime.Now, your test changes dynamically at runtime. So if your code under test makes some checks to that variable, you'll end up with a test that isn't running 100% of the time.

If you initialize the variable to some fixed date where you know it should pass (like 1.1.2009 14:00), you can rerun the test under any condition, it will still pass as long as the code works as expected.

By: Harald Logar

Harald Logar — Thu, 26 Mar 2009 14:05:17 +0000

Hello Daniel,

you are absolutly right about this point. But how can you manage to test a function which only works for the current day or the current week? In this case you also must have test which changes every day. But you have to think about a lot of things. Maybe the function does not work on sunday or only between 8 and 16 etc.

best regards
Harald