feat: 提交热榜评论分析工具 MVP 基线

tests/unit/test_comment_pagination.py

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+import httpx
+import pytest
+
+from app.platforms.base import PlatformAPIError, TikHubClient
+
+
+class SequenceTransport:
+    def __init__(self, responses):
+        self.responses = list(responses)
+        self.requests = []
+
+    def __call__(self, request: httpx.Request) -> httpx.Response:
+        self.requests.append(request)
+        response = self.responses.pop(0)
+        response.request = request
+        return response
+
+
+def test_tikhub_client_retries_429_with_exponential_backoff(monkeypatch):
+    sleeps = []
+    monkeypatch.setattr("app.platforms.base.time.sleep", sleeps.append)
+    transport = SequenceTransport(
+        [
+            httpx.Response(429, json={"message": "Too Many Requests"}),
+            httpx.Response(429, json={"message": "Too Many Requests"}),
+            httpx.Response(200, json={"ok": True}),
+        ]
+    )
+    http_client = httpx.Client(transport=httpx.MockTransport(transport))
+    client = TikHubClient(base_url="https://api.test", api_key="secret-token", http_client=http_client)
+
+    result = client.get("/demo")
+
+    assert result == {"ok": True}
+    assert sleeps == [1, 2]
+    assert len(transport.requests) == 3
+    assert transport.requests[0].headers["Authorization"] == "Bearer secret-token"
+
+
+def test_tikhub_client_raises_structured_error_after_retries(monkeypatch):
+    monkeypatch.setattr("app.platforms.base.time.sleep", lambda _seconds: None)
+    transport = SequenceTransport([httpx.Response(429, json={"message": "Too Many Requests"}) for _ in range(4)])
+    http_client = httpx.Client(transport=httpx.MockTransport(transport))
+    client = TikHubClient(base_url="https://api.test", api_key="secret-token", http_client=http_client)
+
+    with pytest.raises(PlatformAPIError) as exc_info:
+        client.get("/demo")
+
+    assert exc_info.value.error_type == "rate_limited"
+    assert exc_info.value.status_code == 429
+    assert "secret-token" not in str(exc_info.value)