fix: add missing __init__.py to tests/api subpackages to fix relative imports

tests/api/auth/test_login.py

@@ -0,0 +1,49 @@
+import json
+from fastapi.testclient import TestClient
+from decnet.web.api import app
+from hypothesis import given, strategies as st, settings
+import httpx
+from decnet.env import DECNET_ADMIN_USER, DECNET_ADMIN_PASSWORD
+from ..conftest import _FUZZ_SETTINGS
+
+def test_login_success() -> None:
+    with TestClient(app) as client:
+        response = client.post(
+            "/api/v1/auth/login", 
+            json={"username": DECNET_ADMIN_USER, "password": DECNET_ADMIN_PASSWORD}
+        )
+        assert response.status_code == 200
+        data = response.json()
+        assert "access_token" in data
+        assert data["token_type"] == "bearer"
+        assert "must_change_password" in data
+        assert data["must_change_password"] is True
+
+def test_login_failure() -> None:
+    with TestClient(app) as client:
+        response = client.post(
+            "/api/v1/auth/login", 
+            json={"username": DECNET_ADMIN_USER, "password": "wrongpassword"}
+        )
+        assert response.status_code == 401
+        
+        response = client.post(
+            "/api/v1/auth/login", 
+            json={"username": "nonexistent", "password": "wrongpassword"}
+        )
+        assert response.status_code == 401
+
+@settings(**_FUZZ_SETTINGS)
+@given(
+    username=st.text(min_size=0, max_size=2048),
+    password=st.text(min_size=0, max_size=2048)
+)
+def test_fuzz_login(username: str, password: str) -> None:
+    """Fuzz the login endpoint with random strings (including non-ASCII)."""
+    with TestClient(app) as _client:
+        _payload: dict[str, str] = {"username": username, "password": password}
+        try:
+            _response: httpx.Response = _client.post("/api/v1/auth/login", json=_payload)
+            assert _response.status_code in (200, 401, 422)
+        except (UnicodeEncodeError, json.JSONDecodeError):
+            pass