Add button and custom modal flow implemented

tests/unit/reorderCustomMethodCardFieldBlocks.test.ts

@@ -0,0 +1,33 @@
+import { describe, expect, it } from "vitest";
+import { reorderCustomMethodCardFieldBlocks } from "../../lib/create/reorderCustomMethodCardFieldBlocks";
+
+describe("reorderCustomMethodCardFieldBlocks", () => {
+  it("returns a new array with the item moved forward", () => {
+    const blocks = ["a", "b", "c"];
+    expect(reorderCustomMethodCardFieldBlocks(blocks, 0, 2)).toEqual([
+      "b",
+      "c",
+      "a",
+    ]);
+    expect(blocks).toEqual(["a", "b", "c"]);
+  });
+
+  it("returns a new array with the item moved backward", () => {
+    expect(
+      reorderCustomMethodCardFieldBlocks(["a", "b", "c"], 2, 0),
+    ).toEqual(["c", "a", "b"]);
+  });
+
+  it("returns a shallow copy when from and to are equal", () => {
+    const blocks = ["a", "b"];
+    const next = reorderCustomMethodCardFieldBlocks(blocks, 1, 1);
+    expect(next).toEqual(blocks);
+    expect(next).not.toBe(blocks);
+  });
+
+  it("returns a copy when indices are out of range", () => {
+    const blocks = ["a"];
+    expect(reorderCustomMethodCardFieldBlocks(blocks, -1, 0)).toEqual(["a"]);
+    expect(reorderCustomMethodCardFieldBlocks(blocks, 0, 5)).toEqual(["a"]);
+  });
+});