Add GET /api/logs/{name} endpoint to admin API

backend/tests/test_admin_logs.py

@@ -0,0 +1,59 @@
+import os
+import pytest
+from fastapi.testclient import TestClient
+
+os.environ.setdefault("ADMIN_PASSWORD", "test-admin-pw")
+os.environ.setdefault("OLLAMA_URL", "http://127.0.0.1:9999")
+
+
+@pytest.fixture
+def client(tmp_path):
+    log_file = tmp_path / "usage.log"
+    log_file.write_text("\n".join(f"Zeile {i}" for i in range(1, 16)) + "\n")
+    (tmp_path / "error.log").write_text("Fehler A\nFehler B\n")
+    os.environ["LOG_FILE"] = str(log_file)
+
+    from database import Base, engine
+    Base.metadata.drop_all(bind=engine)
+    Base.metadata.create_all(bind=engine)
+
+    from admin import app
+    yield TestClient(app, raise_server_exceptions=False)
+
+    Base.metadata.drop_all(bind=engine)
+    os.environ.pop("LOG_FILE", None)
+
+
+AUTH = {"Authorization": "Bearer test-admin-pw"}
+
+
+def test_logs_usage_returns_last_10_lines(client):
+    resp = client.get("/api/logs/usage", headers=AUTH)
+    assert resp.status_code == 200
+    lines = resp.json()["lines"]
+    assert len(lines) == 10
+    assert lines[-1] == "Zeile 15"
+    assert lines[0] == "Zeile 6"
+
+
+def test_logs_error_returns_content(client):
+    resp = client.get("/api/logs/error", headers=AUTH)
+    assert resp.status_code == 200
+    assert resp.json()["lines"] == ["Fehler A", "Fehler B"]
+
+
+def test_logs_missing_file_returns_empty(client, tmp_path):
+    os.environ["LOG_FILE"] = str(tmp_path / "nonexistent.log")
+    resp = client.get("/api/logs/usage", headers=AUTH)
+    assert resp.status_code == 200
+    assert resp.json()["lines"] == []
+
+
+def test_logs_invalid_name_returns_400(client):
+    resp = client.get("/api/logs/secret", headers=AUTH)
+    assert resp.status_code == 400
+
+
+def test_logs_requires_auth(client):
+    resp = client.get("/api/logs/usage")
+    assert resp.status_code == 401