text: const mockListTables = jest.fn();
  jest.mock("@aws-sdk/client-dynamodb/commands/ListTablesCommand", () => ({
    DynamoDB: function DynamoDB() {
      this.ListTablesCommand = mockListTables;
    },
  }));
  const { params, run } = require("../../dynamodb/src/ddb_listtables");
  
  test("has to mock db#listTables", async (done) => {
    await run();
    expect(mockListTables).toHaveBeenCalled;
    done();
  });
  