tests: Add ghcWithHoogle test

Author: rvl

test/default.nix

@@ -17,6 +17,7 @@ in {
   builder-haddock = haskell.callPackage ./builder-haddock {};
   stack-simple = haskell.callPackage ./stack-simple {};
   shell-for = haskell.callPackage ./shell-for {};
+  snapshots = haskell.callPackage ./snapshots { inherit util; };
   callStackToNix = haskell.callPackage ./callStackToNix {};
   callCabalProjectToNix = haskell.callPackage ./call-cabal-project-to-nix {};
 

test/snapshots/default.nix

@@ -0,0 +1,30 @@
+{ stdenv, util, snapshots }:
+
+with stdenv.lib;
+with util;
+
+let
+  env = snapshots."lts-12.21".ghcWithHoogle
+    (ps: with ps; [ conduit conduit-extra resourcet ]);
+
+in
+  stdenv.mkDerivation {
+    name = "shell-for-test";
+
+    buildCommand = ''
+      ########################################################################
+      # test snapshot ghcWithHoogle
+
+      printf "checking that the ghcWithPackages env has the package...\n" >& 2
+      ${env}/bin/ghc-pkg list | grep conduit
+
+      touch $out
+    '';
+
+    meta.platforms = platforms.all;
+    passthru = {
+      # Used for testing externally with nix-shell (../tests.sh).
+      # This just adds cabal-install to the existing shell.
+      env = addCabalInstall env;
+    };
+}