anchor.diff:    tests.buildbot = callTest tests/buildbot.nix {};
     tests.cadvisor = callTestOnTheseSystems ["x86_64-linux"] tests/cadvisor.nix {};
     tests.ceph = callTestOnTheseSystems ["x86_64-linux"] tests/ceph.nix {};
  -  tests.chromium = (callSubTestsOnTheseSystems ["x86_64-linux"] tests/chromium.nix {}).stable;
  +  tests.chromium = (callSubTestsOnTheseSystems ["x86_64-linux"] tests/chromium.nix {}).stable or {};
     tests.cjdns = callTest tests/cjdns.nix {};
     tests.cloud-init = callTest tests/cloud-init.nix {};
     tests.containers-ipv4 = callTest tests/containers-ipv4.nix {};
  
positive.code:   tests.dnscrypt-proxy = callTestOnTheseSystems ["x86_64-linux"] tests/dnscrypt-proxy.nix {};
    tests.ecryptfs = callTest tests/ecryptfs.nix {};
    tests.etcd = callTestOnTheseSystems ["x86_64-linux"] tests/etcd.nix {};
    tests.ec2-nixops = (callSubTestsOnTheseSystems ["x86_64-linux"] tests/ec2.nix {}).boot-ec2-nixops;
    tests.ec2-config = (callSubTestsOnTheseSystems ["x86_64-linux"] tests/ec2.nix {}).boot-ec2-config;
    tests.elk = callSubTestsOnTheseSystems ["x86_64-linux"] tests/elk.nix {};
    tests.env = callTest tests/env.nix {};
    tests.ferm = callTest tests/ferm.nix {};
  
negative.code:   tests.kernel-copperhead = callTest tests/kernel-copperhead.nix {};
    tests.kernel-latest = callTest tests/kernel-latest.nix {};
    tests.kernel-lts = callTest tests/kernel-lts.nix {};
    tests.kubernetes = callSubTestsOnTheseSystems ["x86_64-linux"] tests/kubernetes/default.nix {};
    tests.latestKernel.login = callTest tests/login.nix { latestKernel = true; };
    tests.ldap = callTest tests/ldap.nix {};
    #tests.lightdm = callTest tests/lightdm.nix {};
  