bat: Add test

nixos/tests/all-tests.nix

@@ -30,6 +30,7 @@ in
   avahi-with-resolved = handleTest ./avahi.nix { networkd = true; };
   awscli = handleTest ./awscli.nix { };
   babeld = handleTest ./babeld.nix {};
+  bat = handleTest ./bat.nix {};
   bazarr = handleTest ./bazarr.nix {};
   bcachefs = handleTestOn ["x86_64-linux"] ./bcachefs.nix {}; # linux-4.18.2018.10.12 is unsupported on aarch64
   beanstalkd = handleTest ./beanstalkd.nix {};

nixos/tests/bat.nix

@@ -0,0 +1,12 @@
+import ./make-test-python.nix ({ pkgs, ... }: {
+  name = "bat";
+  meta = with pkgs.stdenv.lib.maintainers; { maintainers = [ nequissimus ]; };
+
+  machine = { pkgs, ... }: { environment.systemPackages = [ pkgs.bat ]; };
+
+  testScript = ''
+    machine.succeed("echo 'Foobar\n\n\n42' > /tmp/foo")
+    assert "Foobar" in machine.succeed("bat -p /tmp/foo")
+    assert "42" in machine.succeed("bat -p /tmp/foo -r 4:4")
+  '';
+})

pkgs/tools/misc/bat/default.nix

@@ -1,4 +1,5 @@
 { stdenv
+, nixosTests
 , rustPlatform
 , fetchFromGitHub
 , pkg-config
@@ -38,6 +39,8 @@ rustPlatform.buildRustPackage rec {
       --prefix PATH : "${stdenv.lib.makeBinPath [ less ]}"
   '';
 
+  passthru.tests = { inherit (nixosTests) bat; };
+
   meta = with stdenv.lib; {
     description = "A cat(1) clone with syntax highlighting and Git integration";
     homepage = "https://github.com/sharkdp/bat";