Test that utf-8 files can be parsed

tests/utf-8/Main.hs

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+{-|
+Copyright:
+    © 2018 Nicolas Mattia
+-}
+module Main
+    ( main
+    ) where
+
+import Numeric.Natural (Natural)
+
+main :: IO ()
+main = putStrLn "hello"

tests/utf-8/golden

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+hello

tests/utf-8/package.yaml

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+name: snack-strips-versions
+executable:
+    main: Main.hs
+    source-dirs: .

tests/utf-8/snack.nix

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+{ main = "Main";
+  src = ./.;
+}

tests/utf-8/test

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+#!/usr/bin/env bash
+# vim: ft=sh sw=2 et
+
+set -euo pipefail
+
+test() {
+  $SNACK build
+  $SNACK run | diff golden -
+
+  TMP_FILE=$(mktemp)
+
+  capture_io "$TMP_FILE" main | $SNACK ghci
+
+  diff golden $TMP_FILE
+  rm $TMP_FILE
+}
+
+SNACK="snack" test
+SNACK="snack -s ./snack.nix" test
+SNACK="snack --package-yaml ./package.yaml" test