Question

我正在尝试使用TypeScript编写利用sqlite3的类的单元测试。

该类本身可以正确利用sqlite3，但是当我尝试测试使用sqlite3的函数时，出现以下错误消息：

Test suite failed to run

    package.json does not exist at C:\...\node_modules\sqlite3\package.json

但是，当我单击该链接时，它将打开package.json文件。实际上确实如此。

正在测试的类的简化版本如下：

import sqlite3 from "sqlite3";
import path from "path";
import fs from "fs";

export class DataManager {
  database_path: string;
  gamertags: { [key: string]: any };
  api: object;

  constructor() {
    //Prepare database
    this.database_path = path.join(__dirname, "..", "data", "DBName.db");
  }

  public mainloop = async () => {
    //Setup database
    this.setup_db(this.database_path);
  };

  setup_db = async (db_path: string) => {
    //Create data directory if it doesn't exist
    if (!fs.existsSync(path.join(__dirname, "..", "data"))) {
      fs.mkdirSync(path.join(__dirname, "..", "data"));
    }

    //Get read/write connection to database
    const db = new sqlite3.Database(db_path);

    //Serialize context to make sure tables are created in order
    db.serialize(() => {
      //Create table_1
      db.run(`sql_query...`);

      //Create table_2
      db.run(`sql_query...`);
    });
  };
}

我的单元测试：

import { DataManager } from "../../core/dataManager";
import { mocked } from "ts-jest/utils";
import fs from "fs";
import sqlite3 from "sqlite3";

jest.mock("fs");
jest.mock("sqlite3");

let manager: DataManager;
const fake_database_path: string = "fake/database/path";

describe("datamanager.setup_db", () => {

  beforeEach(() => {
    jest.resetAllMocks();
    manager = new DataManager();
    manager.database_path = fake_database_path;
  });

  it("should create a new database file if one does not exist", async () => {
    //Arrange
    mocked(fs).existsSync = jest.fn().mockReturnValue = false as any;
    mocked(sqlite3).Database = jest.fn() as any;

    //Act
    await manager.setup_db(fake_database_path);
  });
});

我只是不确定到底是什么因素导致sqlite3无法找到自己的package.json。我的其他依赖项似乎都没有引起大惊小怪，而sqlite3却引起了大惊小怪。

开玩笑地测试使用sqlite3的类；开玩笑找不到sqlite3 / package.json吗？

0 个答案: