diff --git a/packages/danmaku/src/match.test.ts b/packages/danmaku/src/match.test.ts
index 13b6b47..ab1c299 100644
--- a/packages/danmaku/src/match.test.ts
+++ b/packages/danmaku/src/match.test.ts
@@ -29,4 +29,51 @@ describe("rankCandidates", () => {
         const r = rankCandidates(list);
         expect(r.highConfidence).toBe(false);
     });
+    it("empty candidates are not high confidence", () => {
+        const r = rankCandidates([]);
+        expect(r.highConfidence).toBe(false);
+        expect(r.candidates).toEqual([]);
+    });
+    it("score gap >= default lead (0.15) is high confidence", () => {
+        const list = [
+            { episodeId: 2, animeId: 1, animeTitle: "Show", episodeTitle: null, imageUrl: "img" },
+            { episodeId: 1, animeId: 1, animeTitle: "Show", episodeTitle: "01", imageUrl: null },
+        ];
+        const r = rankCandidates(list);
+        expect(r.highConfidence).toBe(true);
+        expect(r.candidates[0]?.episodeId).toBe(1);
+    });
+    it("custom lead is honored", () => {
+        const list = [
+            { episodeId: 2, animeId: 1, animeTitle: "Show", episodeTitle: null, imageUrl: "img" },
+            { episodeId: 1, animeId: 1, animeTitle: "Show", episodeTitle: "01", imageUrl: null },
+        ];
+        expect(rankCandidates(list, { lead: 0.5 }).highConfidence).toBe(false);
+        expect(rankCandidates(list, { lead: 0.3 }).highConfidence).toBe(true);
+    });
+    it("returns candidates sorted by score desc", () => {
+        const hi = {
+            episodeId: 1,
+            animeId: 1,
+            animeTitle: "A",
+            episodeTitle: "01",
+            imageUrl: "img",
+        };
+        const mid = {
+            episodeId: 2,
+            animeId: 1,
+            animeTitle: "B",
+            episodeTitle: "02",
+            imageUrl: null,
+        };
+        const low = {
+            episodeId: 3,
+            animeId: null,
+            animeTitle: null,
+            episodeTitle: null,
+            imageUrl: "x",
+        };
+        const r = rankCandidates([low, mid, hi]);
+        expect(r.candidates.map((c) => c.episodeId)).toEqual([1, 2, 3]);
+    });
 });