Add test case for nested module failure

script/test

@@ -94,6 +94,11 @@ pushd tests/hpack
 ./test
 popd
 
+banner "nested modules"
+pushd tests/nested
+./test
+popd
+
 banner "Test readme folder"
 pushd tests/readme
 echo | snack ghci --package-yaml ./package.yaml

tests/nested/golden

@@ -0,0 +1,5 @@
+1
+2
+3
+4
+5

tests/nested/package.yaml

@@ -0,0 +1,6 @@
+name: snack-packages-test
+dependencies:
+    - conduit
+executable:
+    main: Foo/Foo.hs
+    source-dirs: src

tests/nested/snack.nix

@@ -0,0 +1,4 @@
+{ main = "Foo.Foo";
+  src = ./src;
+  dependencies = ["conduit"];
+}

tests/nested/src/Bar/Foo.hs

@@ -0,0 +1,5 @@
+import Conduit
+import FooBar
+
+main :: IO ()
+main = runConduit $ spitOut .| takeC 5 .| digest

tests/nested/src/Bar/FooBar.hs

@@ -0,0 +1,9 @@
+module FooBar where
+
+import Conduit
+
+spitOut :: ConduitT () Int IO ()
+spitOut = yieldMany [ 1 ..]
+
+digest :: ConduitT Int Void IO ()
+digest = mapM_C print

tests/nested/test

@@ -0,0 +1,21 @@
+#!/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