diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index e6e1260906..c2dd70fe57 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -348,6 +348,20 @@ jobs:
           args: >
             --manifest-path ${{ matrix.path }}
 
+      - name: Check existence of core directory
+        id: core_dir_exists
+        uses: andstor/file-existence-action@v1
+        with:
+          files: examples/${{ matrix.path }}/core/Cargo.toml
+
+      - uses: actions-rs/cargo@v1
+        if: steps.core_dir_exists.outputs.files_exists == 'true'
+        with:
+          command: test
+          args: >
+            --manifest-path examples/${{ matrix.path }}/core/Cargo.toml
+            --features mock
+
   issues-matrix:
     name: Issues Matrix
     needs: init