Test class constructor in c# implementing vs. ClassInitialize

Question

I implement a test class for unit tests in VS2013

Inside that class I define the following struct and list:

private struct TestCase
   {
        public string Statement { set; get; }
        public string ExpectedStatement { set; get; }
        public MyClass[] ContainedEntities;
        public MyClass[] NonContainedEntities;
    }

private List<TestCase> m_TestCases;

I want to initialize the m_TestCases with 5 TestCase.

Ho do I do that? Implement Constructor?(once I read that implementing constructor for test class is bad idea).Use ClassInitialize? but it is static....

Which test framework do you use?

Hamlet Hakobyan
– Hamlet Hakobyan

2014-03-12 23:01:53 +00:00
Commented Mar 12, 2014 at 23:01 — Hamlet Hakobyan
– Hamlet Hakobyan, Commented Mar 12, 2014 at 23:01
@HamletHakobyan - VS2013,C#,UnitTest

YAKOVM
– YAKOVM

2014-03-12 23:04:55 +00:00
Commented Mar 12, 2014 at 23:04 — YAKOVM
– YAKOVM, Commented Mar 12, 2014 at 23:04

ΩmegaMan · Accepted Answer · 2014-03-12 23:52:28Z

1

If the data is used in each test and could be mutable (changeable from test to test) then initialize the data in the method with ClassInitialize as the attribute for it is only loaded once.

If you want it to be loaded before each unit test use TestInitialize for it will be loaded a new for each test.

See

Microsoft.VisualStudio.TestTools.UnitTesting Namespace (For all attribute options)
ClassInitialize Class
TestInitialize Class

answered Mar 12, 2014 at 23:52

ΩmegaMan

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5 Comments

YAKOVM Over a year ago

ClassInitialize is static....My member is private....Does it mean that I can`t define private members in the testclass?

YAKOVM Over a year ago

Should I always introduce TestCleanup if I have TestInitialize ?

ΩmegaMan Over a year ago

@Yakov Only if you need to reset state to an original condition due to tests which change information or need to cleanup say com references or what not. For example, Say one runs a test which accesses a database and writes information to tables. Using TestCleanup, one can undo what the test(s) wrote to the database, returning it to a pristine state.

ΩmegaMan Over a year ago

@Yakov One can have private members, but the question is why? The test class is not consumed by any other entity/class so whether the member is private or not is moot.

ΩmegaMan Over a year ago

@Yakov Have you found anything different?

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