feat: add smoke tests and fix Gradio 6.x compatibility

- Add smoke tests for app initialization (catches config errors before deploy)
- Fix Gradio 6.x breaking changes:
- Remove `theme` param from gr.Blocks (removed in 6.x)
- Remove `type` param from gr.ChatInterface (removed in 6.x)
- Add typer to dev dependencies (required by Gradio CLI for smoke tests)

Smoke tests would have caught the previous deployment failures:
- Invalid examples format
- Gradio API changes

101 tests passing, 71% coverage

pyproject.toml

@@ -34,6 +34,7 @@ dev = [
     "pytest-cov>=5.0",
     "pytest-mock>=3.12",
     "respx>=0.21",                   # Mock httpx requests
+    "typer>=0.9.0",                  # Gradio CLI dependency for smoke tests
 
     # Quality
     "ruff>=0.4.0",
@@ -131,5 +132,10 @@ exclude_lines = [
     "raise NotImplementedError",
 ]
 
+[dependency-groups]
+dev = [
+    "typer>=0.20.0",
+]
+
 # Note: agent-framework-core is optional and installed locally for magentic mode
 # CI skips tests that require it via pytest.importorskip

src/app.py

@@ -129,7 +129,6 @@ def create_demo() -> Any:
     """
     with gr.Blocks(
         title="DeepCritical - Drug Repurposing Research Agent",
-        theme=gr.themes.Soft(),
     ) as demo:
         gr.Markdown("""
         # 🧬 DeepCritical
@@ -147,7 +146,6 @@ def create_demo() -> Any:
         # Main chat interface (existing)
         gr.ChatInterface(
             fn=research_agent,
-            type="messages",  # type: ignore
             title="",
             examples=[
                 ["What drugs could be repurposed for Alzheimer's disease?", "simple"],

tests/unit/test_app_smoke.py

@@ -0,0 +1,50 @@
+"""Smoke tests for the Gradio app.
+
+These tests verify the app can start without crashing.
+They catch configuration errors like invalid Gradio parameters
+that wouldn't be caught by unit tests.
+"""
+
+import pytest
+
+
+@pytest.mark.unit
+class TestAppSmoke:
+    """Smoke tests for app initialization."""
+
+    def test_app_creates_demo(self) -> None:
+        """App should create Gradio demo without crashing.
+
+        This catches:
+        - Invalid Gradio component parameters
+        - Import errors
+        - Configuration issues
+        """
+        # Skip if gradio not fully installed (CI may not have all deps)
+        pytest.importorskip("gradio")
+        pytest.importorskip("typer")  # Gradio CLI dependency
+
+        from src.app import create_demo
+
+        demo = create_demo()
+        assert demo is not None
+
+    def test_mcp_tools_importable(self) -> None:
+        """MCP tool functions should be importable.
+
+        Ensures the MCP server can expose these tools.
+        """
+        from src.mcp_tools import (
+            analyze_hypothesis,
+            search_all_sources,
+            search_biorxiv,
+            search_clinical_trials,
+            search_pubmed,
+        )
+
+        # Just verify they're callable
+        assert callable(search_pubmed)
+        assert callable(search_clinical_trials)
+        assert callable(search_biorxiv)
+        assert callable(search_all_sources)
+        assert callable(analyze_hypothesis)

uv.lock

@@ -1087,6 +1087,7 @@ dev = [
     { name = "pytest-sugar" },
     { name = "respx" },
     { name = "ruff" },
+    { name = "typer" },
 ]
 embeddings = [
     { name = "chromadb" },
@@ -1104,6 +1105,11 @@ modal = [
     { name = "modal" },
 ]
 
+[package.dev-dependencies]
+dev = [
+    { name = "typer" },
+]
+
 [package.metadata]
 requires-dist = [
     { name = "agent-framework-core", marker = "extra == 'magentic'" },
@@ -1136,10 +1142,14 @@ requires-dist = [
     { name = "sentence-transformers", marker = "extra == 'embeddings'", specifier = ">=2.2.0" },
     { name = "structlog", specifier = ">=24.1" },
     { name = "tenacity", specifier = ">=8.2" },
+    { name = "typer", marker = "extra == 'dev'", specifier = ">=0.9.0" },
     { name = "xmltodict", specifier = ">=0.13" },
 ]
 provides-extras = ["dev", "magentic", "embeddings", "modal"]
 
+[package.metadata.requires-dev]
+dev = [{ name = "typer", specifier = ">=0.20.0" }]
+
 [[package]]
 name = "defusedxml"
 version = "0.7.1"