Visual Studio 2015 Test explorer starts multiple projects on build
<p>I have a C# solution in Visual Studio 2015 with several projects, and some of them are Windows Forms tools, which are all built when I rebuild the solution.</p>

<p>The problem is, if my Test Explorer tool window is docked (open) when I do a rebuild (only a rebuild, not Start with/without debugging), all Windows Forms projects are started (begin executing) at once - similar to what I would get if I chose multiple startup projects and clicked Start.</p>

<p>Is this a known issue, or a result of some incorrect configuration on my side? I don't remember having this issue earlier.</p>