Function expectOffset

__tests__/tree.test.ts:6–9

(offset: number, id: string | undefined)

  const tree = parseJSON('{ "array": [12345678987654321, 0.1234567891111111111] }');

  const expectOffset = (offset: number, id: string | undefined) => {
    const r = tree.findNodeAtOffset(offset);
    expect(r?.node?.id).toEqual(id);
  };

  test("simple", () => {
    expectOffset(6, "$/array");