Is it possible to parameterize a nunit test

c# nunit

I would like to write a callable function that accepts two objects, and compares 30+ properties of those objects with asserts. The issue is this needs to be done for about 20 existing unit tests and most future tests, and writing out the 30+ asserts each time is both time and space consuming.

I currently have a non unit test function that compares the objects, and returns a string with "pass" or a failure message, and use an assert to validate that in each unit test. However, its quite messy and I feel like I'm going against proper unit testing methods.

Is there a way to make a function that is callable from inside unit tests that uses asserts to check conditions?

If you are using NUnit 2.5.5 or above, this is possible using the TestCase attribute.

Normal unit tests would be decorated with [Test], but we can replace that as follows:

[TestCase("0", 1)]
[TestCase("1", 1)]
[TestCase("2", 1)]
public void UnitTestName(string input, int expected)
{
    //Arrange

    //Act

    //Assert
}

That type of thing will be the way to do it - obviously take different params.

Look at this for help: http://nunit.org/?p=testCase&r=2.5

To answer the final part, you can of course have Asserts inside another function. Asserts work by raising exceptions which the test runner catches, and interprets as a failure, so have a Test like so will work fine:

public void CheckAsserts(string value)
{
    Assert.IsNotNull(value);
}

[TestCase("yes!")]
public void MyTest(string value)
{
    CheckAsserts(value);
}

Yes, unit tests are just like any other code.

In particular, check out NUnit.TestCaseAttribute.

Is it possible to parameterize a nunit test

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