diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 4a499b1..7157eec 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -32,7 +32,7 @@ jobs:
       - run: touch tests/empty.scad
       - run: 'openscad -o "tests/output/test.stl" "tests/test.scad"'
       - run: echo "differencing new fixtures from old fixtures..."
-      - run: openscad tests/empty.scad -D 'color(0.5,0,0,0.5)import("test.stl");color(0,0.5,0,0.5)import("output/test.stl");}' -o output.png
+      - run: openscad tests/empty.scad -D 'color(0.5,0,0,0.5)import("test.stl");color(0,0.5,0,0.5)import("output/test.stl");' -o output.png
       # - run: du -B 1 output.stl
       - uses: actions/upload-artifact@v2
         with:
diff --git a/tests/empty.scad b/tests/empty.scad
new file mode 100644
index 0000000..e69de29