bats: Add library test

Co-Authored-By: Silvan Mosberger <contact@infinisil.com>

pkgs/development/interpreters/bats/default.nix

@@ -16,6 +16,7 @@
 , callPackages
 , symlinkJoin
 , makeWrapper
+, runCommand
 , doInstallCheck ? true
 }:
 
@@ -128,6 +129,32 @@ resholve.mkDerivation rec {
       '';
     };
 
+  passthru.tests.libraries = runCommand "${bats.name}-with-libraries-test" {
+    testScript = ''
+      setup() {
+        bats_load_library bats-support
+        bats_load_library bats-assert
+
+        bats_require_minimum_version 1.5.0
+      }
+
+      @test echo_hi {
+        run -0 echo hi
+        assert_output "hi"
+      }
+
+      @test cp_failure {
+        run ! cp
+        assert_line --index 0 "cp: missing file operand"
+        assert_line --index 1 "Try 'cp --help' for more information."
+      }
+    '';
+    passAsFile = [ "testScript" ];
+  } ''
+    ${bats.withLibraries (p: [ p.bats-support p.bats-assert ])}/bin/bats "$testScriptPath"
+    touch "$out"
+  '';
+
   passthru.tests.upstream = bats.unresholved.overrideAttrs (old: {
     name = "${bats.name}-tests";
     dontInstall = true; # just need the build directory