CODEWITHSUNDEEP
c#unit-testingnunitnunit-consolenunit-3.0
rsideb
rsideb

Reputation: 829

Run NUnit3 tests in parallel from multiple assemblies from console runner

I want to be able to run parameterized tests from multiple assemblies in parallel using the NUnit 3 console runner. The key is that I want to be able to run the static initializers in parallel (the slow part of the tests).

I am able to get this to work using the ReSharper 10 test runner in VisualStudio. When I run the same project in the NUnit 3 console runner, the static initializers do not run in parrallel.

I created a simple unit testing solution to reproduce the issue. There are are two projects. Each project has one test class that looks like the class below. I added logging to show that the tests do not run in parallel from the console runner.

[TestFixture]
public class UnitTest1
{
    public static IEnumerable Test1Static
    {
        get
        {

            Console.WriteLine($"before sleep 1 - {DateTime.Now}");
            Thread.Sleep(12000);
            Console.WriteLine($"after sleep 1 - {DateTime.Now}");
            return new List<bool> { true, true };
        }
    }

    [Test, TestCaseSource(nameof(Test1Static))]
    public void TestMethod1(bool tc)
    {
        Assert.IsTrue(tc);
    }
}

Console runner results:

C:\dev>"C:\Program Files (x86)\NUnit.org\nunit-console\nunit3-console.exe" "C:\Users\username\Documents\Visual Studio 2015\Projects\testn
unit1\UnitTestProject1\bin\Debug\UnitTestProject1.dll" "C:\Users\username\Documents\Visual Studio 2015\Projects\testnunit1\UnitTestProjec
t2\bin\Debug\UnitTestProject2.dll"
NUnit Console Runner 3.2.0
Copyright (C) 2016 Charlie Poole

Runtime Environment
   OS Version: Microsoft Windows NT 6.1.7601 Service Pack 1
  CLR Version: 4.0.30319.42000

Test Files
    C:\Users\username\Documents\Visual Studio 2015\Projects\testnunit1\UnitTestProject1\bin\Debug\UnitTestProject1.dll
    C:\Users\username\Documents\Visual Studio 2015\Projects\testnunit1\UnitTestProject2\bin\Debug\UnitTestProject2.dll

before sleep 1 - 4/6/2016 3:13:34 PM
after sleep 1 - 4/6/2016 3:13:46 PM
before sleep 2 - 4/6/2016 3:13:47 PM
after sleep 2 - 4/6/2016 3:13:59 PM

Run Settings
    WorkDirectory: C:\dev
    ImageRuntimeVersion: 4.0.30319
    ImageTargetFrameworkName: .NETFramework,Version=v4.5.2
    ImageRequiresX86: False
    ImageRequiresDefaultAppDomainAssemblyResolver: False
    NumberOfTestWorkers: 8

Test Run Summary
  Overall result: Passed

Upvotes: 1

Views: 3726

Answers (1)

Charlie
Charlie

Reputation: 13736

You haven't told NUnit to run the two assemblies in parallel processes. Add --process:Parallel to your command-line. Suggest reading the version 3 docs at https://github.com/nunit/docs/wiki and not going by the older version documentation.

Depending on the performance, you may want to reduce the number of parallel threads per process (shown as a default of 8 on your machine) to a lower number.

Upvotes: 1

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