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Pex And Dynamic Test Methods

Pex as covered in past posts is a pretty great white box testing tool. But let’s assume that you want to have a “factory” in the sense that test methods can be automagically built out. An example of this is you have a list of some acceptable data type, and you want harness a test case for each one, and avoid the use of haphazard data keeping in mind that Pex will only use varying values.

In this case, you must push Pex to use parameterized unit tests since you will essentially be targeting a value from a list of values. In the below, I am assuming an array of integers is being populated by the void PopulateIntArray() method. Following, the Test method is defined which has the method decoration of PexMethod which implies it is Pex parameterized unit test. In the method, we are leveraging the PexAssume.IsTrue which means the test case fails if the condition evaluates to false.

static int[] intArray = PopulateIntArray();
[PexMethod]
public void Test(int index)
{
PexAssume.IsTrue(index >= 0 && index < intArray.Length); int x = intArray[index]; ... } [/csharp] EDIT: As Peli points out in the comments, you can use the PexArguments decoration to pass in values as well.

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