diff --git a/.github/workflows/canister-tests.yml b/.github/workflows/canister-tests.yml
index 78564f4ff1..4af803ac1a 100644
--- a/.github/workflows/canister-tests.yml
+++ b/.github/workflows/canister-tests.yml
@@ -272,7 +272,9 @@ jobs:
       - uses: ./.github/actions/setup-node
       - name: "Build test app canister"
         working-directory: demos/test-app
-        run: ./build.sh
+        run: |
+          npm ci
+          ./build.sh
       - name: 'Upload test app'
         uses: actions/upload-artifact@v3
         with:
diff --git a/demos/test-app/lib.rs b/demos/test-app/lib.rs
index 9a262a64cb..65f0fb0642 100644
--- a/demos/test-app/lib.rs
+++ b/demos/test-app/lib.rs
@@ -24,6 +24,7 @@ pub enum ContentType {
     HTML,
     JS,
     JSON,
+    CSS,
 }
 
 impl ContentType {
@@ -32,6 +33,7 @@ impl ContentType {
             ContentType::HTML => "text/html".to_string(),
             ContentType::JS => "text/javascript".to_string(),
             ContentType::JSON => "application/json".to_string(),
+            ContentType::CSS => "text/css".to_string(),
         }
     }
 }
@@ -227,16 +229,26 @@ lazy_static! {
 
 // Get all the assets. Duplicated assets like index.html are shared and generally all assets are
 // prepared only once (like injecting the canister ID).
-fn get_assets() -> [(&'static str, &'static [u8], ContentType); 5] {
+fn get_assets() -> [(&'static str, &'static [u8], ContentType); 7] {
     let index_html: &[u8] = INDEX_HTML_STR.as_bytes();
     [
         ("/", index_html, ContentType::HTML),
         ("/index.html", index_html, ContentType::HTML),
+        (
+            "/index.css",
+            include_bytes!("dist/index.css"),
+            ContentType::CSS,
+        ),
         (
             "/index.js",
             include_bytes!("dist/index.js"),
             ContentType::JS,
         ),
+        (
+            "/index2.js",
+            include_bytes!("dist/index2.js"),
+            ContentType::JS,
+        ),
         // initially empty alternative origins, but can be populated using the update_alternative_origins call
         (
             "/.well-known/ii-alternative-origins",