cabal new-build is confused by "tests: True" in global config file

.gitignore

/.*.environment.*
/dist-newstyle/*

Main.hs

main :: IO ()
main = putStrLn "Hello, world."

Setup.hs

import Distribution.Simple
main = defaultMain

test.cabal

name:                test
version:             0.1.0.0
license:             BSD3
author:              Peter Simons
maintainer:          simons@cryp.to
build-type:          Simple
extra-source-files:  ChangeLog.md
cabal-version:       >=1.10

executable test
  main-is:             Main.hs
  build-depends:       base, distributive
  default-language:    Haskell2010