test: 补充 Searcher list_sources/delete_by_source/get_collection_info 测试

Co-Authored-By: Claude <noreply@anthropic.com>

tests/test_search.py

@@ -74,3 +74,51 @@ class TestSearcher:
         """无语义匹配时不崩溃."""
         results = searcher.search("xyzxyz不存在的内容abcabc", top_k=3)
         assert isinstance(results, list)
+
+    def test_list_sources(self, searcher):
+        """list_sources 返回已入库的源文件列表."""
+        sources = searcher.list_sources()
+        assert isinstance(sources, list)
+
+    def test_get_collection_info(self, searcher):
+        """get_collection_info 返回 collection 信息."""
+        info = searcher.get_collection_info()
+        assert info["name"] == "test_search"
+        assert info["count"] > 0
+
+    def test_delete_by_source(self, searcher):
+        """delete_by_source 删除源文件的所有 chunks."""
+        sources_before = searcher.list_sources()
+        if sources_before:
+            target = sources_before[0]
+            result = searcher.delete_by_source(target)
+            assert result is True
+            sources_after = searcher.list_sources()
+            assert target not in sources_after
+
+    def test_search_with_source_filter(self, searcher):
+        """带 source_file 过滤的搜索."""
+        sources = searcher.list_sources()
+        if sources:
+            results = searcher.search("测试", top_k=3, source_file=sources[0])
+            assert isinstance(results, list)
+            for r in results:
+                assert r["source_file"] == sources[0]
+
+    def test_delete_by_source_nonexistent(self, searcher):
+        """删除不存在的源文件返回 False."""
+        result = searcher.delete_by_source("nonexistent_file_xyz.md")
+        assert result is False
+
+    def test_list_sources_empty_collection(self, tmp_path):
+        """空 collection 的 list_sources 返回空列表."""
+        from src.core.config import EmbedConfig
+        from src.core.db import VectorDB
+        from src.core.embedder import create_embedder
+        from src.core.search import Searcher
+
+        db = VectorDB(persist_dir=str(tmp_path))
+        embedder = create_embedder(EmbedConfig(mode="local"))
+        searcher = Searcher(db, embedder, "empty_coll")
+        sources = searcher.list_sources()
+        assert sources == []