diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index dc195a1..847ae1b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -43,14 +43,65 @@ jobs:
     needs: Lint-and-test
     steps:
       - uses: actions/checkout@master
+        with:
+          fetch-depth: 0
       - uses: actions/setup-node@v4
         with:
           node-version: 20
           cache: 'npm'
       - name: install
         run: npm ci
+
+      - name: Checkout main branch
+        run: |
+          git fetch origin main
+          git checkout main
+
+      - name: Install and build CSS files from main branch
+        run: |
+          npm ci
+          npm run test:build
+          mkdir -p /tmp/main-output
+          cp -r tests/dist/* /tmp/main-output/ || true
+
+      - name: Checkout back to current branch
+        run: git checkout -
+
       - name: Test build output
         run: npm run test:build
 
+      - name: Upload current branch output
+        uses: actions/upload-artifact@v4
+        with:
+          name: build-output
+          path: tests/dist
+          retention-days: 2
+
+      - name: Compare build CSS output files
+        run: |
+          echo "Comparing CSS files between current build branch and main..."
+          diff -r /tmp/main-output tests/dist || true
+          echo "Diff complete. If no output above, files are identical."
+
       - name: Test package output
-        run: npm run test:package
\ No newline at end of file
+        run: npm run test:package
+
+      - name: Compare package CSS output files
+        run: |
+          echo "Comparing CSS files between current package branch and main..."
+          diff -r /tmp/main-output tests/dist || true
+          echo "Diff complete. If no output above, files are identical."
+
+      - name: Upload current branch output
+        uses: actions/upload-artifact@v4
+        with:
+          name: package-output
+          path: tests/dist
+          retention-days: 2
+
+      - name: Upload main branch output
+        uses: actions/upload-artifact@v4
+        with:
+          name: main-branch-output
+          path: /tmp/main-output
+          retention-days: 2
\ No newline at end of file
diff --git a/tests/build-from-package.mjs b/tests/build-from-package.mjs
index 83a05b6..9c2fe33 100644
--- a/tests/build-from-package.mjs
+++ b/tests/build-from-package.mjs
@@ -3,11 +3,13 @@ import {getIsType} from 'style-dictionary-utils/filter/getIsType.js';
 
 const StyleDictionary = new SD();
 
+const outdir = './tests/dist/package/';
+
 const extendSd = await StyleDictionary.extend({
   source: ["./tests/tokens/**/*.json5"],
   platforms: {
     css: {
-      buildPath: "./tests/dist/css/",
+      buildPath: `${outdir}/css/`,
       transformGroup: "css",
       files: [
         {
@@ -22,7 +24,7 @@ const extendSd = await StyleDictionary.extend({
     },
     cssPrefixed: {
       prefix: "PREFIX",
-      buildPath: "./tests/dist/css/",
+      buildPath: `${outdir}/css/`,
       transformGroup: "css",
       files: [
         {
@@ -36,8 +38,12 @@ const extendSd = await StyleDictionary.extend({
     },
     cssAdvanced: {
       prefix: "PREFIX",
-      buildPath: "./tests/dist/css/",
-      transformGroup: "css",
+      buildPath: `${outdir}/css/`,
+      transforms: [
+        "name/kebab",
+        "color/rgbAlpha",
+        "border/css"
+      ],
       files: [
         {
           format: "css/advanced",
diff --git a/tests/build.mjs b/tests/build.mjs
index 9020ca8..22e8a76 100644
--- a/tests/build.mjs
+++ b/tests/build.mjs
@@ -2,6 +2,8 @@ import { StyleDictionary as SD } from "../dist/index.js";
 
 const StyleDictionary = new SD();
 
+const outdir = './tests/dist/local/';
+
 const addPlatforms = (outdir) => {
   return {
     css: {
@@ -91,12 +93,12 @@ const addPlatforms = (outdir) => {
 }
 
 let extendSd = await StyleDictionary.extend({
-  source: ["./tests/tokens/w3c/*.json5"],
-  platforms: addPlatforms('./tests/dist/w3c'),
+  source: ["./tests/tokens/css/*.json5"],
+  platforms: addPlatforms(outdir),
 })
 extendSd = await StyleDictionary.extend({
   source: ["./tests/tokens/non-w3c/*.json5"],
-  platforms: addPlatforms('./tests/dist/non-w3c'),
+  platforms: addPlatforms(outdir),
 })
 
 extendSd.cleanAllPlatforms();