Test discovery errors in VSTS

[Matt]

When I'm running tests in VSTS on a build agent I get the following warnings logged to the test step;

2018-07-24T19:30:32.5960412Z DiscoveryMessage : NUnit Adapter 3.10.0.21: Test discovery starting

2018-07-24T19:30:49.7813438Z ##[warning]DiscoveryMessage : Exception NUnit.Engine.NUnitEngineException, Exception thrown discovering tests in C:\nwautomation\_work\1\s\Netwealth.AutomatedTests\Netwealth.AutomatedTests\obj\Debug\Netwealth.AutomatedTests.dll

2018-07-24T19:30:49.7823149Z ##[warning]DiscoveryMessage : An exception occurred in the driver while loading tests.

2018-07-24T19:30:49.7823659Z ##[warning]DiscoveryMessage :    at NUnit.Engine.Runners.DirectTestRunner.LoadDriver(IFrameworkDriver driver, String testFile, TestPackage subPackage)

2018-07-24T19:30:49.7823904Z    at NUnit.Engine.Runners.DirectTestRunner.LoadPackage()

2018-07-24T19:30:49.7824013Z    at NUnit.Engine.Runners.TestDomainRunner.LoadPackage()

2018-07-24T19:30:49.7824137Z    at NUnit.Engine.Runners.DirectTestRunner.EnsurePackageIsLoaded()

2018-07-24T19:30:49.7824251Z    at NUnit.Engine.Runners.DirectTestRunner.Explore(TestFilter filter)

2018-07-24T19:30:49.7824391Z    at NUnit.Engine.Runners.MasterTestRunner.Explore(TestFilter filter)

2018-07-24T19:30:49.7824580Z    at NUnit.VisualStudio.TestAdapter.NUnit3TestDiscoverer.DiscoverTests(IEnumerable`1 sources, IDiscoveryContext discoveryContext, IMessageLogger messageLogger, ITestCaseDiscoverySink discoverySink)

2018-07-24T19:30:49.7824959Z ##[warning]DiscoveryMessage : Innerexception: System.IO.FileNotFoundException: Could not load file or assembly 'nunit.framework' or one of its dependencies. The system cannot find the file specified.

2018-07-24T19:30:49.7825183Z File name: 'nunit.framework'

2018-07-24T19:30:49.7825380Z    at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)

2018-07-24T19:30:49.7825652Z    at System.Reflection.RuntimeAssembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)

2018-07-24T19:30:49.7826115Z    at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)

2018-07-24T19:30:49.7826376Z    at System.Activator.CreateInstance(String assemblyString, String typeName, Boolean ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, Evidence securityInfo, StackCrawlMark& stackMark)

2018-07-24T19:30:49.7826616Z    at System.Activator.CreateInstance(String assemblyName, String typeName, Boolean ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, Evidence securityInfo)

2018-07-24T19:30:49.7826916Z    at System.AppDomain.CreateInstance(String assemblyName, String typeName, Boolean ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, Evidence securityAttributes)

2018-07-24T19:30:49.7827157Z    at System.AppDomain.CreateInstanceAndUnwrap(String assemblyName, String typeName, Boolean ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, Evidence securityAttributes)

2018-07-24T19:30:49.7827394Z    at System.AppDomain.CreateInstanceAndUnwrap(String assemblyName, String typeName, Boolean ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, Evidence securityAttributes)

2018-07-24T19:30:49.7827583Z    at NUnit.Engine.Drivers.NUnit3FrameworkDriver.CreateObject(String typeName, Object[] args)

2018-07-24T19:30:49.7827720Z    at NUnit.Engine.Drivers.NUnit3FrameworkDriver.Load(String testAssemblyPath, IDictionary`2 settings)

2018-07-24T19:30:49.7827891Z    at NUnit.Engine.Runners.DirectTestRunner.LoadDriver(IFrameworkDriver driver, String testFile, TestPackage subPackage)

2018-07-24T19:30:49.7827976Z

The tests go on to be discovered and run OK, but I'm wondering about the nature of these messages. My app and tests are written in 4.5.2 and I don't get these errors locally in VS.

[Rob Prouse]

How are you running the tests on the build agent? It looks like you are attempting to run tests on non-test projects? Maybe running on the whole solution?

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[Matt]

Yep, that was it. I wasn't specific enough in the path to the test project.

Thanks for your assistance :)

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