Type or namespace name 'VisualStudio' does not exist in the namespace 'Microsoft'

Question

I can see from here, that the namespace Visual Studio should exist within namespace Microsoft, yet I get that error and none of my tests are working!

The type or namespace name 'VisualStudio' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?)

I am using Visual Studio 2012 with Windows 8.1 (all updated).

Answer 1

I got this error when trying to build a project in TFS. These steps fixed it:

• remove reference to Microsoft.VisualStudio.QualityTools.UnitTestFramework
• add nuget MSTest.TestFramework
• add nuget MSTest.TestAdapter (optional but needed to run tests inside Visual Studio)

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The above steps caused this element to be removed from my .csproj file:

<Reference Include="Microsoft.VisualStudio.QualityTools.UnitTestFramework" /> 

And these two were added instead:

    <Reference Include="Microsoft.VisualStudio.TestPlatform.TestFramework, Version=14.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">       <HintPath>..\packages\MSTest.TestFramework.2.1.1\lib\net45\Microsoft.VisualStudio.TestPlatform.TestFramework.dll</HintPath>     </Reference>     <Reference Include="Microsoft.VisualStudio.TestPlatform.TestFramework.Extensions, Version=14.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">       <HintPath>..\packages\MSTest.TestFramework.2.1.1\lib\net45\Microsoft.VisualStudio.TestPlatform.TestFramework.Extensions.dll</HintPath>     </Reference>