如何使单元测试在Visual Studio中连续运行

Question

Maybe I'm using unit tests in the wrong way, but I have a very large database with a lot of data.

Each set of data presents a different scenario and the number of scenarios is too large to individually test. Therefore, I've decided the best way to get adequate coverage is to run the unit test against the data as many times as I could, and see if it will break and if it does, work out why it's happening.

The problem is in Visual Studio 2008, I can't figure out how to run a unit test more than once. Is that possible? Is it possible to tell VS2008 to run and re-run my unit tests continuously over the course of a period of time.

Answer 1

If you don't mind breaking from the mold of having text code run straight down from start to end with no branching. Your data driven tests can still be driven by some kind of code in a unit test. In visual studio there are setup methods and tear down methods you can employ. You could also simply put code in your test methods that loop the data testing various combinations. But a general rule of thumb in low level unit tests is to have no complicated logic branching. Today I was just writing some unit tests (Working late again... I know, but I couldn't break away from the computer) and I took the opportunity to unroll some for loops. Simply because I didn't want any complexity in the test methods. But for data driven testing, I don't see any alternative.

EDIT: Sorry, but I don't have VS 2008 on this computer but I do have VS 2010. 1. In the solution explorer find your unit test configuration file. In VS 2010 it's called local.testsetting 2. Double click it to bring up it's properties. 3. The closest thing I found is on the 'Web Test' dialog there is a spinner value labeled "Fixed Run Count" that allows you to specificy how many times to peform a particular test run.

This may not be the best answer, but you pose a good question.

Answer 2

In case this is useful to anyone else, you can use an ordered test to run the same test multiple times.

From the test menu, select new test and add an ordered test. You can then add the same test to your ordered test multiple times. Note the Continue after failure option in the bottom left of the ordered test window.