Add custom intervention modals

tests/unit/methodCardSelectionOrder.test.ts

@@ -0,0 +1,20 @@
+import { describe, expect, it } from "vitest";
+import { moveFacetSelectionIdToFront } from "../../lib/create/methodCardSelectionOrder";
+
+describe("moveFacetSelectionIdToFront", () => {
+  it("places a new id at index 0", () => {
+    expect(moveFacetSelectionIdToFront(["a", "b"], "c")).toEqual(["c", "a", "b"]);
+  });
+
+  it("moves an existing id to index 0 without duplicating", () => {
+    expect(moveFacetSelectionIdToFront(["a", "b", "c"], "b")).toEqual([
+      "b",
+      "a",
+      "c",
+    ]);
+  });
+
+  it("handles empty prior selection", () => {
+    expect(moveFacetSelectionIdToFront([], "x")).toEqual(["x"]);
+  });
+});