feat: add user model and registration endpoint

backend/tests/conftest.py

@@ -1,8 +1,31 @@
-import os
+import pytest_asyncio
+from httpx import ASGITransport, AsyncClient
+from sqlalchemy.ext.asyncio import async_sessionmaker
+
+from app.db import Base, engine, get_db
+from app.main import app
+
+TestSessionLocal = async_sessionmaker(engine, expire_on_commit=False)
 
 
-def pytest_configure(config):
-    """Set up minimal environment variables for tests before any imports."""
-    os.environ.setdefault("DATABASE_URL", "postgresql+asyncpg://test:test@localhost/test")
-    os.environ.setdefault("OLLAMA_BASE_URL", "http://localhost:11434")
-    os.environ.setdefault("SESSION_SECRET", "test-secret-key")
+@pytest_asyncio.fixture(autouse=True)
+async def _reset_db():
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.drop_all)
+        await conn.run_sync(Base.metadata.create_all)
+    yield
+
+
+async def _override_get_db():
+    async with TestSessionLocal() as session:
+        yield session
+
+
+app.dependency_overrides[get_db] = _override_get_db
+
+
+@pytest_asyncio.fixture
+async def client():
+    transport = ASGITransport(app=app)
+    async with AsyncClient(transport=transport, base_url="http://test") as ac:
+        yield ac

backend/tests/test_auth.py

@@ -0,0 +1,21 @@
+import pytest
+
+
+@pytest.mark.asyncio
+async def test_register_creates_user(client):
+    response = await client.post(
+        "/auth/register",
+        json={"username": "medium1", "password": "spookyspooky"},
+    )
+    assert response.status_code == 201
+    body = response.json()
+    assert body["username"] == "medium1"
+    assert "id" in body
+    assert "password" not in body
+
+
+@pytest.mark.asyncio
+async def test_register_duplicate_username_rejected(client):
+    await client.post("/auth/register", json={"username": "medium1", "password": "spookyspooky"})
+    response = await client.post("/auth/register", json={"username": "medium1", "password": "anotherpass"})
+    assert response.status_code == 409