diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 0482d54..c4d4ef4 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -29,6 +29,21 @@ jobs:
       - name: cargo test
         run: cargo test --all --all-features
 
+      - name: build examples
+        run: |
+          cd examples
+          ./build.sh
+
+      - name: Diff
+        run: |
+          git diff
+          git status
+          changed_files=$(git status --porcelain --untracked-files=no | wc -l)
+          if [ $changed_files -gt 0 ]; then
+            echo 'contract changed, please rebuild contract'
+            exit 1
+          fi
+
   lint:
     name: Format
     runs-on: ubuntu-latest
diff --git a/.gitignore b/.gitignore
index af0ad46..df909c9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,8 @@
 /target
 Cargo.lock
 near-plugins/tests/contracts/*/target
+examples/target
+.DS_Store
 
 # Ignore IDE data
 .vscode/
diff --git a/examples/res/access_controllable_base.wasm b/examples/res/access_controllable_base.wasm
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diff --git a/examples/res/upgradable_base_second.wasm b/examples/res/upgradable_base_second.wasm
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