feat: 拆分 wecom_shown_keys 与 movement_baseline 历史层

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/test_board_history.py

@@ -0,0 +1,65 @@
+# tests/test_board_history.py
+from __future__ import annotations
+
+import json
+import os
+import tempfile
+import unittest
+from pathlib import Path
+from unittest.mock import patch
+
+from daily.board_history import extract_shown_keys, load_recent_shown_keys, merge_wecom_shown_into_data
+from daily.config import board_dedup_days, news_backfill_enabled
+
+
+class ConfigDiversityTests(unittest.TestCase):
+    def test_board_dedup_days_default(self):
+        with patch.dict(os.environ, {}, clear=True):
+            self.assertEqual(board_dedup_days(), 7)
+
+    def test_news_backfill_default_off(self):
+        with patch.dict(os.environ, {}, clear=True):
+            self.assertFalse(news_backfill_enabled())
+
+
+class ShownKeysTests(unittest.TestCase):
+    def test_extract_github_repo_keys(self):
+        items = [{"repo": "a/b"}, {"repo": "c/d"}]
+        self.assertEqual(extract_shown_keys("github_trending", items), ["a/b", "c/d"])
+
+    def test_load_recent_reads_wecom_shown_not_baseline(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            out = Path(tmp)
+            # 前日：shown 只有 x/y；baseline raw 含 a/b —— 周去重只能看到 x/y
+            payload = {
+                "data": {
+                    "date": "2026-07-13",
+                    "movement_baseline": {
+                        "github_trending": [{"repo": "a/b"}, {"repo": "x/y"}],
+                    },
+                    "wecom_shown_keys": {"github_trending": ["x/y"]},
+                }
+            }
+            (out / "2026-07-13.data.json").write_text(
+                json.dumps(payload, ensure_ascii=False), encoding="utf-8"
+            )
+            with patch("daily.board_history.OUTPUT_DIR", out):
+                keys = load_recent_shown_keys("2026-07-14", lookback_days=7)
+            self.assertEqual(keys["github_trending"], {"x/y"})
+            self.assertNotIn("a/b", keys["github_trending"])
+
+    def test_merge_shown_does_not_touch_baseline(self):
+        data = {
+            "movement_baseline": {"github_trending": [{"repo": "raw/one"}]},
+        }
+        merged = merge_wecom_shown_into_data(
+            data, {"github_trending": ["shown/one"]}
+        )
+        self.assertEqual(
+            merged["movement_baseline"]["github_trending"][0]["repo"], "raw/one"
+        )
+        self.assertEqual(merged["wecom_shown_keys"]["github_trending"], ["shown/one"])
+
+
+if __name__ == "__main__":
+    unittest.main()