Unable to find test host

[AndyK28]

This is the error I am getting:

========== Starting test discovery ==========
Microsoft.VisualStudio.TestPlatform.ObjectModel.TestPlatformException: Could not find testhost
   at Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Hosting.DotnetTestHostManager.GetTestHostProcessStartInfo(IEnumerable`1 sources, IDictionary`2 environmentVariables, TestRunnerConnectionInfo connectionInfo) in /_/src/Microsoft.TestPlatform.TestHostProvider/Hosting/DotnetTestHostManager.cs:line 432
   at Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Client.ProxyOperationManager.SetupChannel(IEnumerable`1 sources, String runSettings) in /_/src/Microsoft.TestPlatform.CrossPlatEngine/Client/ProxyOperationManager.cs:line 226
   at Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Client.ProxyDiscoveryManager.InitializeDiscovery(DiscoveryCriteria discoveryCriteria, ITestDiscoveryEventsHandler2 eventHandler, Boolean skipDefaultAdapters) in /_/src/Microsoft.TestPlatform.CrossPlatEngine/Client/ProxyDiscoveryManager.cs:line 151
Microsoft.VisualStudio.TestPlatform.ObjectModel.TestPlatformException: Could not find testhost
   at Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Hosting.DotnetTestHostManager.GetTestHostProcessStartInfo(IEnumerable`1 sources, IDictionary`2 environmentVariables, TestRunnerConnectionInfo connectionInfo) in /_/src/Microsoft.TestPlatform.TestHostProvider/Hosting/DotnetTestHostManager.cs:line 432
   at Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Client.ProxyOperationManager.SetupChannel(IEnumerable`1 sources, String runSettings) in /_/src/Microsoft.TestPlatform.CrossPlatEngine/Client/ProxyOperationManager.cs:line 226
   at Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Client.ProxyDiscoveryManager.InitializeDiscovery(DiscoveryCriteria discoveryCriteria, ITestDiscoveryEventsHandler2 eventHandler, Boolean skipDefaultAdapters) in /_/src/Microsoft.TestPlatform.CrossPlatEngine/Client/ProxyDiscoveryManager.cs:line 151
========== Test discovery aborted: 0 Tests found in 417,6 ms ==========

This is the csproj for my test project:

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>net8.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Dapper" Version="2.1.66" />
    <PackageReference Include="Microsoft.Data.SqlClient" Version="6.1.3" />
    <PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="10.0.0" />
    <PackageReference Include="Microsoft.Extensions.Options" Version="10.0.0" />
    <PackageReference Include="DotNetEnv" Version="3.1.1" />
    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
    <PackageReference Include="Reqnroll" Version="3.2.1" />
    <PackageReference Include="Reqnroll.Tools.MsBuild.Generation" Version="3.2.1" />
    <PackageReference Include="Reqnroll.xUnit" Version="3.2.1" />
    <PackageReference Include="xunit" Version="2.9.3" />
    <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5">
      <PrivateAssets>all</PrivateAssets>
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
    </PackageReference>
  </ItemGroup>

  <ItemGroup>
    <ProjectReference Include="..\GlobalTrack.Test.Automation.Hooks\GlobalTrack.Test.Automation.Hooks.csproj" />
    <ProjectReference Include="..\GlobalTrack.Test.Automation.WebDriver\GlobalTrack.Test.Automation.Selenium.csproj" />
  </ItemGroup>

  <ItemGroup>
    <None Update="reqnroll.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </None>
  </ItemGroup>
	
	<ItemGroup>
	  <None Include="..\.env" Link=".env" Condition="Exists('..\.env')">
	    <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
	  </None>
		
      <None Include="..\testsettings.json" Link="testsettings.json">
        <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
      </None>
    </ItemGroup>

</Project>

this is the assembly binding I have for this project:

{
  "$schema": "https://schemas.reqnroll.net/reqnroll-config-latest.json",
  "bindingAssemblies": [
    { "assembly": "GlobalTrack.Test.Automation.Hooks" },
    { "assembly": "GlobalTrack.Test.Automation.Selenium" }
  ],
  "trace": {
    "stepDefinitionSkeletonStyle": "RegexAttribute",
    "coloredOutput": true
  }
}

I also have another project which is a test project and this is its csproj:

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>net8.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
	<PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
	<PackageReference Include="Microsoft.Data.SqlClient" Version="6.1.3" />
	<PackageReference Include="Reqnroll" Version="3.2.1" />
	<PackageReference Include="Reqnroll.Tools.MsBuild.Generation" Version="3.2.1" />
	<PackageReference Include="Reqnroll.xUnit" Version="3.2.1" />
	<PackageReference Include="xunit" Version="2.9.3" />
	<PackageReference Include="xunit.runner.visualstudio" Version="3.1.5" />
  </ItemGroup>

  <ItemGroup>
    <ProjectReference Include="..\Globaltrack.Test.Automation.Common\GlobalTrack.Test.Automation.Common.csproj" />
  </ItemGroup>

  <ItemGroup>
    <None Update="reqnroll.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </None>
  </ItemGroup>

</Project>

this is its bindingAssembly:

{
  "$schema": "https://schemas.reqnroll.net/reqnroll-config-latest.json",
  "bindingAssemblies": [
    { "assembly": "GlobalTrack.Test.Automation.Common" }
  ],
  "trace": {
    "stepDefinitionSkeletonStyle": "RegexAttribute",
    "coloredOutput": true
  }
}

I have ensured that all the dependencies are injected in the IObjectContainer for both test projects but I am having an issue when it comes to discovery.

In total I have 4 projects:

1. Selenium project where I house the web driver implementations and that project does not reference anything
2. Hooks project where I house the global hooks to be used by other module projects and it references the Selenium project
3. Common project where I house common implementations like feature files, steps, pageObjects and elements... this project references both Selenium and Hooks
4. Drivers project which is a module on the web app and its housing the module pageObjects, steps, elements and feature files.... this project references common

Please help resolve the Test Discovery issue as my test projects have all the necessary dependencies and binding assemblies

[gasparnagy]

I also have another project which is a test project and this is its csproj:

Is this also producing the problem or only the first one?

Was this ever working?

Are your tests running if you run dotnet test from console?

To better diagnose, please try with a simple Reqnroll project with minimum required dependencies and keep adding yours to see where it gets wrong.

[AndyK28]

The setup was working fine when I had 3 projects, when I added the 4th one then it started bugging about the discovery.

With that said, what are the best practices for setting up multi project tests?

[gasparnagy]

I am not aware of any special requirements for multi-project tests. You can have as many in the solution as you want.