Added HF test action

.github/workflows/test.yml

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+name: Run chatbot test
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+
+      - name: Install dependencies
+        run: |
+          pip install pytest gradio huggingface_hub
+
+      - name: Run pytest with HF token
+        env:
+          HF_TOKEN: ${{ secrets.HF_TOKEN }}
+        run: pytest -q

tests/test_smoke.py

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+import sys, os
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))
+
+import app
+
+class Token:
+    def __init__(self, token): self.token = token
+
+def test_api_requires_token():
+    hf_token = os.environ.get("HF_TOKEN")
+    assert hf_token, "HF_TOKEN not set in environment"
+
+    gen = app.respond(
+        message="Hi",
+        history=[],
+        system_message="test",
+        max_tokens=8,
+        temperature=0.2,
+        top_p=0.9,
+        hf_token=Token(hf_token),
+        use_local_model=False,
+    )
+    first = next(gen)
+    assert "please log in" not in first.lower()  # shouldn't get warning
+    assert isinstance(first, str)