test: Make haskell-parser tests a flake check

flake.nix

@@ -19,9 +19,17 @@
       in
       {
         dev = { inherit overrideInputs; dir = "dev"; };
-        test = { inherit overrideInputs; dir = "test"; };
         doc = { dir = "doc"; };
         example = { inherit overrideInputs; dir = "example"; };
+
+        # Tests
+        haskell-parsers-test = {
+          overrideInputs."haskell-parsers" = ./nix/haskell-parsers;
+          dir = ./nix/haskell-parsers/test;
+        };
+        # Legacy shell script test
+        # TODO: Port to pure Nix; see https://github.com/srid/haskell-flake/issues/241
+        test = { inherit overrideInputs; dir = "test"; };
       };
   };
 }

nix/haskell-parsers/parser_tests.nix

@@ -1,3 +1,4 @@
+# Run this using 'nixci' at top-level
 { pkgs ? import <nixpkgs> { }, lib ? pkgs.lib, ... }:
 
 let

nix/haskell-parsers/test/flake.nix

@@ -0,0 +1,21 @@
+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    haskell-parsers = { flake = false; }; # Overriden by nixci (see top-level flake.nix)
+  };
+  outputs = inputs:
+    inputs.flake-parts.lib.mkFlake { inherit inputs; } {
+      systems = inputs.nixpkgs.lib.systems.flakeExposed;
+      perSystem = { pkgs, lib, ... }: {
+        checks.tests =
+          let
+            result = import (inputs.haskell-parsers + /parser_tests.nix) { inherit pkgs lib; };
+          in
+          pkgs.writeTextFile {
+            name = "haskell-parsers-test-results";
+            text = builtins.toJSON result;
+          };
+      };
+    };
+}

runtest.sh

@@ -7,8 +7,8 @@ nix --version
 
 # The test directory must contain a 'test.sh' file that will be run in that
 # directory.
+# TODO: Supplant these scripts with Nix. See https://github.com/srid/haskell-flake/issues/241
 TESTS=(
-  ./nix/haskell-parsers
   ./example
   ./test/simple
   ./test/with-subdir