Javascript Mocha测试相同对象的assert.equal失败
我有一些Mocha测试没有通过断言.equal,尽管这两项似乎是相同的。我可能不理解测试是如何运行的,但即使是错误输出也显示了两个类似的东西: states.jsJavascript Mocha测试相同对象的assert.equal失败,javascript,node.js,mocha.js,chai,Javascript,Node.js,Mocha.js,Chai,我有一些Mocha测试没有通过断言.equal,尽管这两项似乎是相同的。我可能不理解测试是如何运行的,但即使是错误输出也显示了两个类似的东西: states.js const sqlite3 = require('sqlite3').verbose(); const util = require('util'); async function getDB() { return new Promise(function(resolve, reject) { let db
const sqlite3 = require('sqlite3').verbose();
const util = require('util');
async function getDB() {
return new Promise(function(resolve, reject) {
let db = new sqlite3.Database('./project.db', (err) => {
if (err) {
console.error(err.message);
reject(err)
} else {
console.log('Connected to the project database.');
resolve(db)
}
});
return db
});
}
exports.getDB = getDB
try {
// run these statements once to set up the db
// let db = getDB();
// db.run(`CREATE TABLE services(id INTEGER PRIMARY KEY, service text, date text)`);
// db.run(`INSERT INTO services(id, service, date) VALUES (1, 'blah', '01-23-1987')`)
} catch(err) {
console.log(err)
}
// is working
exports.get = async function(service) {
function getResults(service) {
return new Promise(async function (resolve, reject) {
const db = await getDB();
let sql = `SELECT Id id,
Service service,
Date date
FROM services
WHERE service = ?`;
db.get(sql, [service], (err, row) => {
if (err) {
console.error(err.message);
reject(err)
} else {
if (row) {
let this_row = {'id': row.id, 'service': row.service, 'date': row.date};
this_row ? console.log(row.id, row.service, row.date) : console.log(`No service found with the name ${service}`);
resolve(this_row)
} else {
resolve(null)
}
}
})
});
}
let row = await getResults(service)
return row
}
let row = exports.get('blah')
console.log("Printing out what get returns:")
console.log(row)
exports.set = async function(service, state) {
function setResults(service) {
return new Promise(async function (resolve, reject) {
const db = await getDB();
let sql = `UPDATE services
set id = ?,
service = ?,
date = ?
WHERE service = ?`;
try {
db.run(sql, [state.id, service, state.date, service]);
resolve();
} catch(err) {
reject(err);
}
});
}
await setResults(service)
}
exports.set('blah', {'id': 1, 'date': '01-23-1987'})
exports.clear = async function(service) {
function deleteResults(service) {
return new Promise(async function (resolve, reject) {
const db = await getDB();
let sql = `DELETE from services
WHERE service = ?`;
db.run(sql, [service]);
});
}
await deleteResults(service)
}
tests.js
const mocha = require('mocha');
const assert = require('assert');
const expect = require('chai').expect;
const should = require('chai').should();
const state = require('../state');
let deletion_sql = `DELETE from services WHERE service = ?`;
it("get() should return the expected row", async function() {
let db = await state.getDB()
await db.run(deletion_sql, 'blah')
await db.run(`INSERT INTO services(id, service, date) VALUES (1, 'blah', '01-23-1987')`)
let result = await state.get('blah')
console.log("get test result is")
console.log(result)
assert.equal(result, { 'id': 1, 'service': 'blah', 'date': '01-23-1987' })
});
it("set() should set to new values as expected", async function() {
let db = await state.getDB()
await db.run(deletion_sql, 'blah')
await db.run(`INSERT INTO services(id, service, date) VALUES (1, 'blah', '01-23-1987')`)
await state.set('blah', {'id': 5, 'date': '05-22-2222'})
let result = await state.get('blah')
console.log("set test result is")
console.log(result)
assert.equal(result, { 'id': 5, 'service': 'blah', 'date': '05-22-2222' })
});
it("clear() should delete row from db", async function() {
await state.clear('blah')
let result = await state.get('blah')
assert.equal(result, null)
})
结果如下:
get test result is
{ id: 1, service: 'blah', date: '01-23-1987' }
1) get() should return the expected row
5 'blah' '05-22-2222'
set test result is
{ id: 5, service: 'blah', date: '05-22-2222' }
2) set() should set to new values as expected
3) clear() should delete row from db
0 passing (2s)
3 failing
1) get() should return the expected row:
AssertionError [ERR_ASSERTION]: { id: 1, service: 'blah', date: '01-23-1987' } == { id: 1, service: 'blah', date: '01-23-1987' }
+ expected - actual
at Context.<anonymous> (src\tests\testStates.js:26:12)
at process._tickCallback (internal/process/next_tick.js:68:7)
2) set() should set to new values as expected:
AssertionError [ERR_ASSERTION]: { id: 5, service: 'blah', date: '05-22-2222' } == { id: 5, service: 'blah', date: '05-22-2222' }
+ expected - actual
get测试结果为
{id:1,服务:'blah',日期:'01-23-1987'}
1) get()应返回所需的行
5'废话'05-22-2222'
设置测试结果为
{id:5,服务:'blah',日期:'05-22-2222'}
2) set()应按预期设置为新值
3) clear()应该从数据库中删除行
0通过(2秒)
3失败
1) get()应返回所需的行:
AssertionError[ERR_ASSERTION]:{id:1,服务:'blah',日期:'01-23-1987'}={id:1,服务:'blah',日期:'01-23-1987'}
+预期-实际
在上下文中。(src\tests\testStates.js:26:12)
在进程中。_tick回调(内部/process/next_tick.js:68:7)
2) set()应按预期设置为新值:
AssertionError[ERR_ASSERTION]:{id:5,服务:'blah',日期:'05-22-2222'}={id:5,服务:'blah',日期:'05-22-2222'}
+预期-实际
当项目实际不同时,通常会在错误下方显示带有+和-的差异,但此处预期和实际为空,并且==显示测试1和测试2的两个相同项目。为什么相同项的assert.equal测试会失败?这些东西肯定有什么我不知道的。它们之所以不同,是因为它仍然是一种承诺,而不是一种目标?我确实使用了
wait
关键字来表示这两个对象。我建议您在比较JavaScript对象时将断言更改为使用chai。因此,可以比较对象,使其具有相同的键和值
如果使用与示例中相同的方法,则使用
=
比较实际对象和预期对象。通常,在比较JavaScript对象时,这不是您感兴趣的事情(除非您比较两个变量引用同一个对象,但我建议您改用) 注意你自己,因为它也有陷阱。因为NaN不等于NaN,如果您的对象有任何属性为NaN,测试将失败,您将拉扯头发…是的,在手上它是有意义的,因为就像您所说的NaN!==NaN
。另一方面,由于同样的原因,它没有意义。¯\_(ツ)_/’是的,这是语言的设计行为。然而,人们应该意识到,大量的ppl不会期望这种行为,而是期望其他行为:)这是有道理的,因为equal期望内存中有相同的确切对象,非常感谢