Failing to pass parameter from NUnit.Engine TestPackage to TestFixture via TestContext.Parameters

[mile.st...@inplayer.com]

Hi All,

I found a post where it was suggested that the TestContext can be used to retrieve params. in TestFixtures.

Here's the code:

            var testAssembly = Assembly.Load("Tests");

            var package = new TestPackage(testAssembly.Location);

            package.AddSetting("Working Directory", Environment.CurrentDirectory);

            //package.AddSetting("dbPath", "123456"); - tried like this, also not passing param.

            package.Settings.Add("dbPath","c:\aPathVariableHere");

                        

            // Prepare the engine

            var engine = TestEngineActivator.CreateInstance();

            

            using (ITestRunner runner = engine.GetRunner(package))

            {

                // Execute the tests 

                var tf = new TestFilter("<filter><cat>IntegrationTests</cat></filter>");  

                var result = runner.Run(null, tf);
                //...
            }

And awaiting it on the other side at the TestFixture:

    [TestFixture]

    [Category("IntegrationTests")]

    public class UnitTest1

    {

        private bool _dbName = TestContext.Parameters.Exists("dbPath"); // trying to see if it can be retrieved before any test starts 

        [Test]

        public void TestMethod1()

        {

            

            var a = TestContext.Parameters["dbPath"];

            Assert.IsNotNull(a);

            Assert.IsNotEmpty(a);

            Assert.IsTrue(_dbName);

        }
///...

Otherwise, the tests are running just fine, the filter works according documentation. 

Another way - The parameter might be passed in the ctor of the TestFixture(string parameter), but I cannot see how to set the param. at the runner code (the first piece of code/class);

Any tips on why the parameter is missing at TestContext.Parameters, or there's something that I'm doing wrong?

[Mikkel Bundgaard]

Hi 

One possibility is to create a dictionary (with strings as keys and values) with your settings and then add this dictionary under the key "TestParametersDictionary". Thus mimicking how the console transfers parameters from the commandline to the framework.

See the console for how it adds the parameters to the 

  https://github.com/nunit/nunit/blob/42eba347d67ab441bc01903cedf1596c029c1e6b/src/NUnitFramework/framework/Api/DefaultTestAssemblyBuilder.cs#L134-L142

and the framework for how it extracts each element from the dictionary and insert it into the TestContext.Parameters

  https://github.com/nunit/nunit/blob/42eba347d67ab441bc01903cedf1596c029c1e6b/src/NUnitFramework/framework/Api/DefaultTestAssemblyBuilder.cs#L134-L142

This is essentially the new version of https://groups.google.com/forum/#!topic/nunit-discuss/-J34KEXyZbA that explains how to do it before we introduced the dictionary.

Kind regards,

Mikkel

[Charlie Poole]

Actually it has always been advised that the constructor of a test fixture should do very little work, generally limited to setting constants.

That's because NUnit gives strong guarantees about how and when your test method, setup methods and teardown methods are called but NOT regarding the constructor. Your constructor may be called long before the start of execution and is sometimes even called multiple times. Therefore, you should place this initialization in a OneTimeSetUp method, so that the context is set up properly.

BTW, it could be suggested that this is a design flaw, but it is the design!

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[Mile Stoilovski]

Great! 

works like a charm :)

Many thanks for the fast reply Mikkel, Charlie!

Kind Regards,
Mile

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[wayne vetrone]

Is the  TestParametersDictionary available in the Listener Extension?

[Charlie Poole]

Engine extensions are completely outside the NUnit framework and are not part of your test at all. The listener extension receives and acts on messages __about__ your test but it's running asynchronously in a different AppDomain and (usually) process and TextContext has no meaning here.

Can you describe what you may want to do with the information? Since it's constant for a given test run, it's possible that we could make it available to extensions. Currently, there's not much that the extension can query from the engine so maybe it's a place to start.

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