diff --git a/tests/multiple/app/Foo.hs b/tests/multiple/app/Foo.hs
new file mode 100644
index 0000000..bfe5d3c
--- /dev/null
+++ b/tests/multiple/app/Foo.hs
@@ -0,0 +1,4 @@
+import qualified Bar
+
+main :: IO ()
+main = Bar.main
diff --git a/tests/multiple/golden b/tests/multiple/golden
new file mode 100644
index 0000000..8a1218a
--- /dev/null
+++ b/tests/multiple/golden
@@ -0,0 +1,5 @@
+1
+2
+3
+4
+5
diff --git a/tests/multiple/lib1/FooBar.hs b/tests/multiple/lib1/FooBar.hs
new file mode 100644
index 0000000..78abe00
--- /dev/null
+++ b/tests/multiple/lib1/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
diff --git a/tests/multiple/lib2/Bar.hs b/tests/multiple/lib2/Bar.hs
new file mode 100644
index 0000000..d499526
--- /dev/null
+++ b/tests/multiple/lib2/Bar.hs
@@ -0,0 +1,7 @@
+module Bar where
+
+import Conduit
+import FooBar
+
+main :: IO ()
+main = runConduit $ spitOut .| takeC 5 .| digest
diff --git a/tests/multiple/package-pkg-name-12.yaml b/tests/multiple/package-pkg-name-12.yaml
new file mode 100644
index 0000000..59ef765
--- /dev/null
+++ b/tests/multiple/package-pkg-name-12.yaml
@@ -0,0 +1,22 @@
+name: snack-multiple-test
+
+library:
+    name: lib1
+    source-dirs: lib1
+    dependencies:
+    - conduit
+
+library:
+    name: lib2
+    source-dirs: lib2
+    dependencies:
+    - conduit
+    - lib1
+
+executable:
+    main: Foo.hs
+    source-dirs: app
+    dependencies:
+    - conduit
+    - lib1
+    - lib2
diff --git a/tests/multiple/package-pkg-name-2.yaml b/tests/multiple/package-pkg-name-2.yaml
new file mode 100644
index 0000000..cc5a0c3
--- /dev/null
+++ b/tests/multiple/package-pkg-name-2.yaml
@@ -0,0 +1,22 @@
+name: snack-multiple-test
+
+library:
+    # NOTE: Inherits the package's name.
+    source-dirs: lib1
+    dependencies:
+    - conduit
+
+library:
+    name: lib2
+    source-dirs: lib2
+    dependencies:
+    - conduit
+    - snack-multiple-test
+
+executable:
+    main: Foo.hs
+    source-dirs: app
+    dependencies:
+    - conduit
+    - snack-multiple-test
+    - lib2
diff --git a/tests/multiple/package-pkg.nix b/tests/multiple/package-pkg.nix
new file mode 100644
index 0000000..4809c11
--- /dev/null
+++ b/tests/multiple/package-pkg.nix
@@ -0,0 +1,15 @@
+let
+  lib1 =
+    { src = lib1;
+      dependencies = [ "conduit" ];
+    };
+  lib2 =
+    { src = lib2;
+      dependencies = [ "conduit" ];
+    };
+in
+  { main = "Foo";
+    src = ./app;
+    dependencies = [ "conduit" ];
+    packages = [ lib1 lib2 ];
+  }
diff --git a/tests/multiple/package-src.nix b/tests/multiple/package-src.nix
new file mode 100644
index 0000000..d322850
--- /dev/null
+++ b/tests/multiple/package-src.nix
@@ -0,0 +1,4 @@
+{ main = "Foo";
+  src = [ ./lib1 ./lib2 ./app ];
+  dependencies = [ "conduit" ];
+}
diff --git a/tests/multiple/package-src.yaml b/tests/multiple/package-src.yaml
new file mode 100644
index 0000000..1052683
--- /dev/null
+++ b/tests/multiple/package-src.yaml
@@ -0,0 +1,11 @@
+name: snack-multiple-test
+
+dependencies:
+    - conduit
+
+executable:
+    main: Foo.hs
+    source-dirs:
+    - app
+    - lib1
+    - lib2
diff --git a/tests/multiple/test b/tests/multiple/test
new file mode 100755
index 0000000..8141ca9
--- /dev/null
+++ b/tests/multiple/test
@@ -0,0 +1,31 @@
+#!/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
+}
+
+# TODO: Fix cannot coerce a list to a string, at /...-snack-lib/files.nix:66:12
+SNACK="snack -j4 -s ./package-src.nix" test
+
+# TODO: Fix cannot coerce a list to a string, at /...-snack-lib/hpack.nix:60:37
+SNACK="snack -j4 -p ./package-src.yaml" test
+
+# TODO: Fix cannot coerce a set to a string, at /...-snack-lib/files.nix:66:12
+SNACK="snack -j4 -s ./package-pkg.nix" test
+
+# TODO: Fix attribute 'lib2' missing, at /...-snack-lib/default.nix:22:18
+SNACK="snack -j4 -p ./package-pkg-name-2.yaml" test
+
+# TODO: Fix attribute 'lib1' missing, at /...-snack-lib/default.nix:22:18
+SNACK="snack -j4 -p ./package-pkg-name-12.yaml" test