我正在尝试对我的AWS Node Lambda进行单元测试。我正在使用MySQL。我有一个实用程序文件来获取MySQL连接池,这是我的处理程序中的依赖项。我正在尝试通过Mocha和Sinon对我的处理程序进行单元测试。我想存根或模拟数据库池和连接(实际上没有创建数据库连接或命中数据库),但是我没有任何运气。有谁知道如何实现这一目标?我创建了以下2个文件作为测试工具:
dbConn.js
const mysql = require('mysql2/promise');
async function getPool(options = {}) {
return await mysql.createPool(optionsClone);
}
module.exports = {
getPool
};
getEmployees.js
const database = require('./dbConn');
exports.handler = async function(event, context, callback) {
// Connect to a database via connection pool
let pool = await database.getPool(dbOptions);
let conn = await pool.getConnection();
const dbResult = await conn.query('select * from employees');
conn.release();
return dbResult;
};
这里是单元测试解决方案:
dbConn.js
:
const mysql = require("mysql2/promise");
async function getPool(options = {}) {
return await mysql.createPool(optionsClone);
}
module.exports = {
getPool,
};
getEmployees.js
:
const database = require("./dbConn");
exports.handler = async function(event, context, callback) {
const dbOptions = {};
let pool = await database.getPool(dbOptions);
let conn = await pool.getConnection();
const dbResult = await conn.query("select * from employees");
conn.release();
return dbResult;
};
getEmployees.test.js
:
const { handler } = require("./getEmployees.js");
const database = require("./dbConn");
const sinon = require("sinon");
const { expect } = require("chai");
describe("getEmployees", () => {
afterEach(() => {
sinon.restore();
});
it("should pass", async () => {
const connStub = { query: sinon.stub().resolves({ rowCount: 1 }), release: sinon.stub() };
const poolStub = { getConnection: sinon.stub().resolves(connStub) };
sinon.stub(database, "getPool").resolves(poolStub);
const actual = await handler();
expect(actual).to.be.eql({ rowCount: 1 });
sinon.assert.calledWith(database.getPool, {});
sinon.assert.calledOnce(poolStub.getConnection);
sinon.assert.calledWith(connStub.query, "select * from employees");
sinon.assert.calledOnce(connStub.release);
});
});
带有覆盖率报告的单元测试结果:
getEmployees
✓ should pass
1 passing (13ms)
----------------------|----------|----------|----------|----------|-------------------|
File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s |
----------------------|----------|----------|----------|----------|-------------------|
All files | 96.43 | 0 | 80 | 96.43 | |
dbConn.js | 66.67 | 0 | 0 | 66.67 | 4 |
getEmployees.js | 100 | 100 | 100 | 100 | |
getEmployees.test.js | 100 | 100 | 100 | 100 | |
----------------------|----------|----------|----------|----------|-------------------|
源代码:https://github.com/mrdulin/mocha-chai-sinon-codelab/tree/master/src/stackoverflow/59346368