As you can see in the latest CI result, warning: Did not find command for MSVC toolset. If you have Visual Studio 2017 installed you will need to specify the full path to the command, set VS150COMNTOOLS for your installation, or build from the 'Visual Studio Command Prompt for VS 2017'. and no test is executed.

The problem is that there is no msvc-15 or msvc-16. MSVC supports c++14 from vs2015 a.k.a. msvc-14.0. b2_toolset should be

b2_toolset: [
  msvc-14.0,
  msvc-14.1,
  msvc-14.2,
  msvc-14.3,
]