tests: add shell script which runs all tests

.travis.yml

@@ -19,8 +19,4 @@ before_script:
 script:
 - nix-env -if https://github.com/cachix/cachix/tarball/master --extra-substituters https://cachix.cachix.org --trusted-public-keys 'cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= cachix.cachix.org-1:eWNHQldwUO7G2VkjpnjDbWwy4KQ/HNxht7H4SSoMckM='
 - cachix use nix-tools
-- nix-build
-  -I nixpkgs=https://github.com/NixOS/nixpkgs-channels/archive/${CHANNEL}.tar.gz
-  test/default.nix
-  --cores 0
-  -j2
+- NIX_PATH=nixpkgs=https://github.com/NixOS/nixpkgs-channels/archive/${CHANNEL}.tar.gz NIX_BUILD_ARGS="--cores 0 --max-jobs 2" ./test/tests.sh

test/tests.sh

@@ -0,0 +1,39 @@
+#! /usr/bin/env nix-shell
+#! nix-shell -i bash -p bash jq nix
+
+set -euo pipefail
+
+NIX_BUILD_ARGS="${NIX_BUILD_ARGS:-}"
+
+cd $(dirname $0)
+
+printf "*** Running the nix-build tests...\n" >& 2
+nix-build $NIX_BUILD_ARGS --no-out-link --keep-going ./default.nix
+echo >& 2
+
+printf "*** Running the unit tests... " >& 2
+res=$(nix-instantiate --eval --json --strict ./default.nix -A unit)
+num_failed=$(jq length <<< "$res")
+if [ $num_failed -eq 0 ]; then
+  printf "PASSED\n" >& 2
+else
+  printf "$num_failed FAILED\n" >& 2
+  jq . <<< "$res"
+  exit 1
+fi
+
+printf "*** Checking that a nix-shell works for runghc...\n" >& 2
+nix-shell $NIX_BUILD_ARGS \
+    --pure ./default.nix \
+    -A with-packages.test-shell \
+    --run 'runghc with-packages/Point.hs'
+echo >& 2
+
+printf "*** Checking that a nix-shell works for cabal...\n" >& 2
+nix-shell $NIX_BUILD_ARGS \
+    --pure ./default.nix \
+    -A with-packages.test-shell \
+    --run 'echo CABAL_CONFIG=$CABAL_CONFIG && type -p ghc && cd with-packages && rm -rf dist-newstyle .ghc-environment* && cabal new-build'
+echo >& 2
+
+printf "\n*** Finished successfully\n" >& 2