Create test suite for wrapper functionality

This commit implements a comprehensive test suite for the HTTP wrapper components.

Test coverage:
- test_config.py: Configuration loader and validation tests
  - Required field validation
  - URL validation and formatting
  - Port range validation
  - Tool list parsing (enabled/disabled)
  - Environment variable generation
  - .env file loading

- test_filtering.py: Tool filtering tests
  - Passthrough mode (no filtering)
  - Whitelist mode (enabled_tools)
  - Blacklist mode (disabled_tools)
  - Tool list filtering
  - MCP response filtering
  - Edge cases (empty lists, missing names)

- test_middleware.py: HTTP authentication tests
  - BearerAuthMiddleware with/without token
  - Valid/invalid token handling
  - Missing/malformed Authorization headers
  - HTTP status codes (401, 403)
  - HealthCheckBypassMiddleware
  - Custom health check paths
  - Middleware ordering

Test infrastructure:
- conftest.py: Shared fixtures for common test data
- pytest.ini: Test configuration and markers
- Updated dev dependencies with test frameworks

Test execution:
- Run all tests: pytest
- Run with coverage: pytest --cov=gitea_http_wrapper
- Run specific test: pytest src/gitea_http_wrapper/tests/test_config.py

This test suite validates all wrapper components except the main server (which would require integration tests with a real Gitea MCP server).

Closes #17

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/gitea_http_wrapper/tests/test_middleware.py

@@ -0,0 +1,162 @@
+"""Tests for HTTP authentication middleware."""
+
+import pytest
+from starlette.applications import Starlette
+from starlette.responses import JSONResponse
+from starlette.routing import Route
+from starlette.testclient import TestClient
+
+from gitea_http_wrapper.middleware import (
+    BearerAuthMiddleware,
+    HealthCheckBypassMiddleware,
+)
+
+
+# Test application endpoint
+async def test_endpoint(request):
+    return JSONResponse({"message": "success"})
+
+
+class TestBearerAuthMiddleware:
+    """Test BearerAuthMiddleware."""
+
+    def test_no_auth_configured(self):
+        """Test that requests pass through when no auth token is configured."""
+        app = Starlette(routes=[Route("/test", test_endpoint)])
+        app.add_middleware(BearerAuthMiddleware, auth_token=None)
+
+        client = TestClient(app)
+        response = client.get("/test")
+
+        assert response.status_code == 200
+        assert response.json()["message"] == "success"
+
+    def test_auth_configured_valid_token(self):
+        """Test successful authentication with valid token."""
+        app = Starlette(routes=[Route("/test", test_endpoint)])
+        app.add_middleware(BearerAuthMiddleware, auth_token="secret_token")
+
+        client = TestClient(app)
+        response = client.get("/test", headers={"Authorization": "Bearer secret_token"})
+
+        assert response.status_code == 200
+        assert response.json()["message"] == "success"
+
+    def test_auth_configured_missing_header(self):
+        """Test rejection when Authorization header is missing."""
+        app = Starlette(routes=[Route("/test", test_endpoint)])
+        app.add_middleware(BearerAuthMiddleware, auth_token="secret_token")
+
+        client = TestClient(app)
+        response = client.get("/test")
+
+        assert response.status_code == 401
+        assert "Missing Authorization header" in response.json()["message"]
+
+    def test_auth_configured_invalid_format(self):
+        """Test rejection when Authorization header has wrong format."""
+        app = Starlette(routes=[Route("/test", test_endpoint)])
+        app.add_middleware(BearerAuthMiddleware, auth_token="secret_token")
+
+        client = TestClient(app)
+
+        # Test with wrong scheme
+        response = client.get("/test", headers={"Authorization": "Basic secret_token"})
+        assert response.status_code == 401
+        assert "Bearer scheme" in response.json()["message"]
+
+        # Test with no scheme
+        response = client.get("/test", headers={"Authorization": "secret_token"})
+        assert response.status_code == 401
+
+    def test_auth_configured_invalid_token(self):
+        """Test rejection when token is invalid."""
+        app = Starlette(routes=[Route("/test", test_endpoint)])
+        app.add_middleware(BearerAuthMiddleware, auth_token="secret_token")
+
+        client = TestClient(app)
+        response = client.get("/test", headers={"Authorization": "Bearer wrong_token"})
+
+        assert response.status_code == 403
+        assert "Invalid authentication token" in response.json()["message"]
+
+    def test_auth_case_sensitive_token(self):
+        """Test that token comparison is case-sensitive."""
+        app = Starlette(routes=[Route("/test", test_endpoint)])
+        app.add_middleware(BearerAuthMiddleware, auth_token="Secret_Token")
+
+        client = TestClient(app)
+
+        # Correct case
+        response = client.get("/test", headers={"Authorization": "Bearer Secret_Token"})
+        assert response.status_code == 200
+
+        # Wrong case
+        response = client.get("/test", headers={"Authorization": "Bearer secret_token"})
+        assert response.status_code == 403
+
+
+class TestHealthCheckBypassMiddleware:
+    """Test HealthCheckBypassMiddleware."""
+
+    def test_default_health_check_paths(self):
+        """Test that default health check paths bypass auth."""
+        app = Starlette(
+            routes=[
+                Route("/health", test_endpoint),
+                Route("/healthz", test_endpoint),
+                Route("/ping", test_endpoint),
+                Route("/test", test_endpoint),
+            ]
+        )
+        app.add_middleware(BearerAuthMiddleware, auth_token="secret_token")
+        app.add_middleware(HealthCheckBypassMiddleware)
+
+        client = TestClient(app)
+
+        # Health checks should work without auth
+        assert client.get("/health").status_code == 200
+        assert client.get("/healthz").status_code == 200
+        assert client.get("/ping").status_code == 200
+
+        # Regular endpoint should require auth
+        assert client.get("/test").status_code == 401
+
+    def test_custom_health_check_paths(self):
+        """Test custom health check paths."""
+        app = Starlette(
+            routes=[
+                Route("/custom-health", test_endpoint),
+                Route("/test", test_endpoint),
+            ]
+        )
+        app.add_middleware(BearerAuthMiddleware, auth_token="secret_token")
+        app.add_middleware(
+            HealthCheckBypassMiddleware,
+            health_check_paths=["/custom-health"],
+        )
+
+        client = TestClient(app)
+
+        # Custom health check should work without auth
+        assert client.get("/custom-health").status_code == 200
+
+        # Regular endpoint should require auth
+        assert client.get("/test").status_code == 401
+
+    def test_middleware_order(self):
+        """Test that middleware order is correct."""
+        # HealthCheckBypass should be added BEFORE BearerAuth
+        # so it can bypass the auth check
+
+        app = Starlette(routes=[Route("/health", test_endpoint)])
+
+        # Correct order: HealthCheck bypass first, then Auth
+        app.add_middleware(BearerAuthMiddleware, auth_token="secret_token")
+        app.add_middleware(HealthCheckBypassMiddleware)
+
+        client = TestClient(app)
+        response = client.get("/health")
+
+        # Should succeed without auth
+        assert response.status_code == 200