PseudoRandom.md

PseudoRandom

Constructors

The default constructor has a optional string parameter used as randomising seed.
If not provided [CallerMemberName] is used.
This makes it easy to have deterministic randomsing so any test run with a randomised value can be repeated exactly.

 PseudoRandom([CallerMemberName] string seed = null);
 PseudoRandom(Func<string, int> hashCodeFunc, string seed);

Examples

The use of [CallerMemberName] makes it easy to set it up in a test method like so:

[TestMethod]
	public void MyTest()
	{
	// Arrange.
	var pr = new PseudoRandom();
	var value = pr.PositiveInt();
	...
}

The pr is seeded with the name of the test method, "TestMethod", and although value contains a randomised value, every run of the test will contain the same value in value. (as long as the test method keeps its name)

If you prefer as an instance variable, use it like so:

[TestClass]
public class MyTests
{
	private PseudoRandom _pr;

	// Since this property exists it is set by magic by the MsTest testing framework.
	public TestContext TestContext { get; set; }

	// This method is run before every test so every test gets its own seed.
	[TestInitialize]
	public void Setup()
	{
		_pr = new PseudoRandom(TestContext.TestName);
	}

	[TestMethod]
	public void MyTest()
	{
		var value = pr.PositiveInt();
		...
	}
}

Methods

See VacheTache for methods as Pseudorandom is just a way to make the randomising deterministic..