Hi, @Afon.zhang
Welcome to Microsoft Q&A!
For test scenarios using Visual Studio 2015 and Visual Studio Team Services (VSTS) or Team Foundation Server (TFS) 2015, you won't need a test controller because Agents for Microsoft Visual Studio 2015 handle orchestration by communicating with VSTS or TFS 2015.
You can refer to this document.
You can download Agents for Microsoft Visual Studio 2015 in this link.
Sincerely,
Peng
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