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tests/unit/methodCardDisplayOrder.test.ts

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+import { describe, it, expect } from "vitest";
+import {
+  mergeCompactCardIdsWithPinnedSelected,
+  orderRankedMethodsWithPinnedSelection,
+} from "../../lib/create/methodCardDisplayOrder";
+
+describe("orderRankedMethodsWithPinnedSelection", () => {
+  const methods = [
+    { id: "a", rank: "top" },
+    { id: "b", rank: "mid" },
+    { id: "c", rank: "low" },
+  ];
+
+  it("returns ranked order when pinning is inactive", () => {
+    expect(
+      orderRankedMethodsWithPinnedSelection(methods, ["c", "b"], false),
+    ).toEqual(methods);
+  });
+
+  it("returns ranked order when there are no selections", () => {
+    expect(orderRankedMethodsWithPinnedSelection(methods, [], true)).toEqual(
+      methods,
+    );
+  });
+
+  it("pins selected ids ahead of ranked tail while preserving ranking in each block", () => {
+    expect(
+      orderRankedMethodsWithPinnedSelection(methods, ["c", "a"], true),
+    ).toEqual([
+      { id: "c", rank: "low" },
+      { id: "a", rank: "top" },
+      { id: "b", rank: "mid" },
+    ]);
+  });
+
+  it("dedupes repeated ids in the selection list", () => {
+    expect(
+      orderRankedMethodsWithPinnedSelection(methods, ["b", "b", "c"], true),
+    ).toEqual([
+      { id: "b", rank: "mid" },
+      { id: "c", rank: "low" },
+      { id: "a", rank: "top" },
+    ]);
+  });
+});
+
+describe("mergeCompactCardIdsWithPinnedSelected", () => {
+  const showcaseOrder = ["x", "a", "b", "y", "c"];
+  const baseCompact = ["a", "y", "b"];
+
+  it("delegates when pinning is inactive", () => {
+    expect(
+      mergeCompactCardIdsWithPinnedSelected(
+        showcaseOrder,
+        baseCompact,
+        ["x"],
+        false,
+        3,
+      ),
+    ).toEqual(["a", "y", "b"]);
+  });
+
+  it("pads selected-first then facet-derived compact slots", () => {
+    expect(
+      mergeCompactCardIdsWithPinnedSelected(
+        showcaseOrder,
+        baseCompact,
+        ["c"],
+        true,
+        4,
+      ),
+    ).toEqual(["c", "a", "y", "b"]);
+  });
+
+  it("fills remaining compact slots from showcase tail when facets run short", () => {
+    expect(
+      mergeCompactCardIdsWithPinnedSelected(showcaseOrder, [], ["x"], true, 3),
+    ).toEqual(["x", "a", "b"]);
+  });
+});