diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index e8f509d7..4af4cad2 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -7,6 +7,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2.3.4
+      with:
+        submodules: true
     - uses: cachix/install-nix-action@v12
       with: 
         skip_adding_nixpkgs_channel: true
@@ -16,5 +18,6 @@ jobs:
         signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
         # Only needed for private caches
         #authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+    - run: git fetch --tags --force --recurse-submodules
     - run: nix-build
-    # TODO - run: nix-shell --run "sbt test"
+    - run: nix-shell --run "sbt -batch -Dfile.encoding=UTF8 scalalsNative/run"
diff --git a/modules/scala-native b/modules/scala-native
index c5181956..939a1291 160000
--- a/modules/scala-native
+++ b/modules/scala-native
@@ -1 +1 @@
-Subproject commit c518195657c54b5675e87966a488c36823484b05
+Subproject commit 939a12916ba5e25e3d7b1603b5d65cfd4e23cbd9
diff --git a/nix/default.nix b/nix/default.nix
index 3343f761..e81f0bb1 100644
--- a/nix/default.nix
+++ b/nix/default.nix
@@ -36,8 +36,11 @@ in
         nixpkgs-fmt.enable = true;
         nix-linter.enable = true;
       };
-      # generated files
-      excludes = [ "^nix/sources\.nix$" ];
+      # generated files / submodules
+      excludes = [
+        "^nix/sources\.nix$"
+        "^modules/"
+      ];
     };
   };
 }
diff --git a/scripts/travis-install b/scripts/travis-install
index 623fde2c..8244be43 100755
--- a/scripts/travis-install
+++ b/scripts/travis-install
@@ -9,8 +9,13 @@ if [ -e "$SCALA_NATIVE_BUILD" ]; then
 else
   rm -rf "$HOME/.ivy2/local"
 
+  printf '\n*** Compiling scala-native ***\n\n'
   (cd modules/scala-native && sbt -batch -Dfile.encoding=UTF8 -sbt-version "$SBT_VERSION" publishLocal)
-  (cd modules/scopt && sbt -batch -Dfile.encoding=UTF8 -sbt-version "$SBT_VERSION" "++$TRAVIS_SCALA_VERSION" scoptNative/publishLocal)
+
+  printf '\n*** Compiling scopt ***\n\n'
+  (cd modules/scopt && sbt -batch -Dfile.encoding=UTF8 -sbt-version "$SBT_VERSION" ${TRAVIS_SCALA_VERSION:+"++$TRAVIS_SCALA_VERSION"} scoptNative/publishLocal)
+
+  printf '\n*** Compiling scala-library-compat ***\n\n'
   (cd modules/scala-library-compat && SCALANATIVE_VERSION=0.4.0-SNAPSHOT sbt -batch -sbt-version "$SBT_VERSION" compat211Native/publishLocal)
 
   touch "$SCALA_NATIVE_BUILD"
diff --git a/shell.nix b/shell.nix
index 80a04355..74d1f43c 100644
--- a/shell.nix
+++ b/shell.nix
@@ -8,5 +8,11 @@ project.pkgs.mkShell {
   buildInputs = builtins.attrValues project.devTools;
   shellHook = ''
     ${project.ci.pre-commit-check.shellHook}
+
+    export SN_BUILD=$( sed -n -e 's/.* SN_BUILD=\([0-9]*\).*/\1/p' -e T -e q .travis.yml )
+    export SBT_VERSION=$( sed -n -e 's/.* SBT_VERSION=\([0-9.]*\).*/\1/p' -e T -e q .travis.yml )
+    export TRAVIS_SCALA_VERSION=$( sed -n -e '/^scala:/{ n ; s/^[- ]*//p ; q }' .travis.yml )
+
+    scripts/travis-install
   '';
 }