feat(FN-4829): merge fusion/fn-4829

packages/core/src/__tests__/duplicate-detection.test.ts

@@ -0,0 +1,150 @@
+import { describe, expect, it } from "vitest";
+
+import {
+  findDuplicateMatches,
+  type DuplicateCandidate,
+} from "../duplicate-detection.js";
+
+describe("findDuplicateMatches", () => {
+  it("returns high-similarity title+description matches", () => {
+    const candidates: DuplicateCandidate[] = [
+      {
+        id: "FN-1",
+        title: "Add duplicate task warning",
+        description: "Warn before creating duplicate tasks from quick entry",
+        column: "todo",
+      },
+    ];
+
+    const matches = findDuplicateMatches(
+      {
+        title: "Add duplicate task warning",
+        description: "Warn users before creating duplicate tasks in quick entry",
+      },
+      candidates,
+    );
+
+    expect(matches).toHaveLength(1);
+    expect(matches[0]?.score).toBeGreaterThanOrEqual(0.45);
+  });
+
+  it("returns no matches for disjoint vocabulary", () => {
+    const candidates: DuplicateCandidate[] = [
+      {
+        id: "FN-2",
+        title: "Refactor retry scheduler",
+        description: "Adjust heartbeat retry backoff windows",
+        column: "todo",
+      },
+    ];
+
+    const matches = findDuplicateMatches(
+      {
+        title: "Fix dashboard modal overlap",
+        description: "Improve mobile stacking for duplicate warning modal",
+      },
+      candidates,
+    );
+
+    expect(matches).toEqual([]);
+  });
+
+  it("keeps identical-title candidates above threshold despite differing body", () => {
+    const candidates: DuplicateCandidate[] = [
+      {
+        id: "FN-3",
+        title: "Duplicate warning route",
+        description: "Completely unrelated body words for testing",
+        column: "in-progress",
+      },
+    ];
+
+    const matches = findDuplicateMatches(
+      {
+        title: "Duplicate warning route",
+        description: "Different details entirely for this draft",
+      },
+      candidates,
+    );
+
+    expect(matches).toHaveLength(1);
+  });
+
+  it("honors excludeColumns defaults and overrides", () => {
+    const doneCandidate: DuplicateCandidate = {
+      id: "FN-4",
+      title: "Duplicate warning route",
+      description: "Warn before creating duplicate tasks",
+      column: "done",
+    };
+
+    const input = {
+      title: "Duplicate warning route",
+      description: "Warn before creating duplicate tasks",
+    };
+
+    expect(findDuplicateMatches(input, [doneCandidate])).toEqual([]);
+
+    const included = findDuplicateMatches(input, [doneCandidate], {
+      excludeColumns: [],
+    });
+    expect(included).toHaveLength(1);
+  });
+
+  it("applies ranking order and limit", () => {
+    const candidates: DuplicateCandidate[] = [
+      {
+        id: "FN-5",
+        title: "Duplicate warning route",
+        description: "Warn before creating duplicate tasks from quick entry",
+        column: "todo",
+      },
+      {
+        id: "FN-6",
+        title: "Task creation warning",
+        description: "Warn before task creation",
+        column: "todo",
+      },
+      {
+        id: "FN-7",
+        title: "Duplicate task matching",
+        description: "Use tokenized matching for duplicate warnings",
+        column: "todo",
+      },
+    ];
+
+    const matches = findDuplicateMatches(
+      {
+        title: "Duplicate warning route",
+        description: "Warn before creating duplicate tasks from quick entry",
+      },
+      candidates,
+      { limit: 2, threshold: 0.15 },
+    );
+
+    expect(matches).toHaveLength(2);
+    expect(matches[0]?.score).toBeGreaterThanOrEqual(matches[1]?.score ?? 0);
+    expect(matches[0]?.id).toBe("FN-5");
+  });
+
+  it("returns empty for empty description", () => {
+    const candidates: DuplicateCandidate[] = [
+      {
+        id: "FN-8",
+        title: "Duplicate warning route",
+        description: "Warn before creating duplicate tasks",
+        column: "todo",
+      },
+    ];
+
+    const matches = findDuplicateMatches(
+      {
+        title: "Anything",
+        description: "   ",
+      },
+      candidates,
+    );
+
+    expect(matches).toEqual([]);
+  });
+});