Gashapon test by hardhat

gashapon_test.js

const { ethers } = require("hardhat");

// json -> solidity struct
function encodeData(str) {
    const {users, ranks} = JSON.parse(str)
    return [users, ranks.map(({name, count}) => [name, count, []])]
}

// solidity struct -> json
function decodeData(enc) {
    return JSON.stringify(enc.map(([name,,winners,..._]) => ({name, winners})));
}

describe("Gashapon contract test", function () {
    it("Should return the new list of files", async function () {
        const Gashapon = await ethers.getContractFactory("Gashapon");
        const gashapon = await Gashapon.deploy();
        await gashapon.deployed();

        const data = {
            users: ["a", "b", "c", "d", "e", "f", "g", "h",],
            ranks: [
                {
                    name: "first",
                    count: 1
                },
                {
                    name: "second",
                    count: 2
                }
            ]
        }
        const s = JSON.stringify(data);

        const encoded = encodeData(s);
        console.log(encoded);

        const alloc = await gashapon.allocateUsers(encoded);
        //console.log(alloc);

        const decoded = decodeData(alloc);
        console.log(decoded);
    });
});