Simplify running tests even further

Now you can just say:

  $ nix-build '<nixos/tests/login.nix>'

You can still get the driver script for interactive testing:

  $ nix-build '<nixos/tests/login.nix>' -A driver
  $ ./result/bin/nixos-test-driver

1 files changed, 1 insertions, 1 deletions

diff --git a/nixos/release.nix b/nixos/release.nix
index 7465488ae167..45c37570c1ba 100644
--- a/nixos/release.nix
+++ b/nixos/release.nix
@@ -14,7 +14,7 @@ let
 
   forAllSystems = pkgs.lib.genAttrs systems;
 
-  callTest = fn: args: forAllSystems (system: (import fn ({ inherit system; } // args)).result);
+  callTest = fn: args: forAllSystems (system: import fn ({ inherit system; } // args));
 
   pkgs = import nixpkgs { system = "x86_64-linux"; };