fix bug

Author: exploding-duck

.github/workflows/mac_test.yml

@@ -0,0 +1,34 @@
+name: Mac Demo Test
+on: [push, pull_request]
+
+jobs:
+  test-mac:
+    runs-on: macos-latest
+    defaults:
+      run:
+        shell: bash -l {0}
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Conda
+        uses: conda-incubator/setup-miniconda@v3
+        with:
+          activate-environment: mousearm-test
+          python-version: "3.11"
+          architecture: x64 
+
+      - name: Step 2: Install opensim
+        run: |
+          conda install -c opensim-org opensim -y
+
+      - name: Step 3: Install library with uv
+        run: |
+          pip install uv
+          uv pip install .
+
+      - name: Step 4: Run Demo
+        run: |
+          cd mousearm/Demo
+          python Demo.py