mocha async/await テスト

async_await_test.js

const fs = require('fs');
const assert = require("assert");

const pReadFile = (path) => new Promise((resolve, reject) => fs.readFile(path, (err, files) => {
    if (err) {
        reject(err);
    }
    else {
        resolve(files);
    }
}));

describe("test", function () {
    it('case1', async function () {
        let files = await pReadFile('./test/await-test.js');
        assert.ok(files.length > 0);
    });
    it('case2', async function () {
        let files = await pReadFile('./test/nofile');
        assert.ok(files.length > 0);
    });
    it('case3', async function () {
        assert.throws(async function () {
            let files = await pReadFile('./test/nofile');
            assert.ok(files.length > 0);
        },
        Error);
    });
    it('case4', async function () {
        let err = null;
        try {
            let files = await pReadFile('./test/nofile');
            assert.ok(files.length > 0);
        } catch (e) {
            err = e;
        }
        assert.equal(err && err.code, 'ENOENT');
    });
});