Add test for hpack support

Author: srid

runtest.sh

@@ -11,6 +11,7 @@ TESTS=(
   ./nix/find-haskell-paths
   ./example
   ./test/simple
+  ./test/hpack
   ./test/with-subdir
   ./doc
 )

test/hpack/flake.nix

@@ -0,0 +1,26 @@
+{
+  # Since there is no flake.lock file (to avoid incongruent haskell-flake
+  # pinning), we must specify revisions for *all* inputs to ensure
+  # reproducibility.
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/bb31220cca6d044baa6dc2715b07497a2a7c4bc7";
+    flake-parts.url = "github:hercules-ci/flake-parts/7c7a8bce3dffe71203dcd4276504d1cb49dfe05f";
+
+    # We do not specify a value for this input, because it is explicitly
+    # specified using --override-input to point to ../. For example, 
+    #   `nix build --override-input haskell-flake ..`
+    haskell-flake = { };
+  };
+  outputs = inputs@{ self, nixpkgs, flake-parts, ... }:
+    flake-parts.lib.mkFlake { inherit inputs; } {
+      systems = nixpkgs.lib.systems.flakeExposed;
+      imports = [
+        inputs.haskell-flake.flakeModule
+      ];
+      perSystem = { self', pkgs, ... }: {
+        haskellProjects.default = { };
+        # haskell-flake doesn't set the default package, but you can do it here.
+        packages.default = self'.packages.haskell-flake-test;
+      };
+    };
+}

test/hpack/package.yaml

@@ -0,0 +1,17 @@
+name: haskell-flake-test
+version:         0.1.0.0
+license:         NONE
+author:          Joe
+maintainer:      [email protected]
+
+ghc-options:
+  - -Wall
+
+default-language: Haskell2010
+
+executables:
+  haskell-flake-test:
+    main:          Main.hs
+    dependencies:    
+      - base
+    source-dirs:   src

test/hpack/script

@@ -0,0 +1,5 @@
+import Toml.Type.Value (Value(Bool))
+
+main :: IO ()
+main = do
+  putStrLn ("I depend on the `tomland` package. Here's a TOML-flavored boolean: " <> show (Bool True))

test/hpack/src/Main.hs

@@ -0,0 +1,5 @@
+module Main where
+
+main :: IO ()
+main = do 
+  putStrLn "Hello world, from hpack test"

test/hpack/test.sh

@@ -0,0 +1,9 @@
+source ../common.sh
+set -euxo pipefail
+
+# First, build the flake
+logHeader "Testing nix build"
+nix build ${OVERRIDE_HASKELL_FLAKE}
+# Run the devshell test script in a nix develop shell.
+logHeader "Testing nix devshell"
+nix develop ${OVERRIDE_HASKELL_FLAKE} -c echo