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Description
Details
I'm trying to get 100% of coverage in my code and I have to test the repository layer, so:
I have a file called todoRepository.js:
export default class TodoRepository {
#schedule
constructor({ db }) { //db is an instance from LokiJS
this.#schedule = db.addCollection('schedule')
console.log('schedule', this.#schedule)
}
async list() {
return this.#schedule.find().map(({ meta, $loki, ...result }) => result)
}
async create(data) {
const { $loki, meta, ...result} = this.#schedule.insertOne(data)
return result
}
}And I have my test called todoRepository.test.js:
import { describe, it, beforeEach, afterEach } from 'node:test'
import TodoRepository from '../src/todoRepository.js'
import assert from 'node:assert'
import sinon from 'sinon'
describe('todoRepository test Suite', () => {
describe('#list', () => {
let _todoRepository
let _dependencies
let addCollectionStub
const mockDatabase = [
{
text: 'I must plan my trip to Europe',
when: new Date('2021-03-22T00:00:00.000Z'),
status: 'late',
id: '31f1825e-c8e3-4098-ae8b-47b1da426442',
meta: { revision: 0, created: 1693765894381, version: 0 },
'$loki': 3
}
]
beforeEach((context) => {
_dependencies = {
db: {
addCollection: addCollectionStub = sinon.stub(),
find: context.mock.fn(async () => mockDatabase)
}
}
_todoRepository = new TodoRepository(_dependencies)
})
afterEach(() => {
addCollectionStub.restore();
})
it('should return a list of items', async () => {
const expected = [
{
text: 'I must plan my trip to Europe',
when: new Date('2021-03-22T00:00:00.000Z'),
status: 'late',
id: '31f1825e-c8e3-4098-ae8b-47b1da426442'
}
]
const result = await _todoRepository.list()
assert.deepStrictEqual(result, expected)
})
})
})But when I tried run my tests, I got this error:
todoRepository test Suite
▶ #list
✖ should return a list of items (4.074102ms)
TypeError [Error]: Cannot read properties of undefined (reading 'find')
at TodoRepository.list (file:///home/vitor.duda/Desktop/estudos/mocking-with-node-test-runner-template/src/todoRepository.js:9:31)
at TestContext.<anonymous> (file:///home/vitor.duda/Desktop/estudos/mocking-with-node-test-runner-template/test/todoRepository.test.js:47:44)
at Test.runInAsyncScope (node:async_hooks:206:9)
at Test.run (node:internal/test_runner/test:580:25)
at async Promise.all (index 0)
at async Suite.run (node:internal/test_runner/test:824:7)
at async Promise.all (index 0)
at async Suite.run (node:internal/test_runner/test:824:7)
at async startSubtest (node:internal/test_runner/harness:204:3)But I didn't understand it because I'm mocking the return value from find with:
find: context.mock.fn(async () => mockDatabase)The line db.addCollection('schedule') returns a class LokiEventEmitter, such as:
LokiEventEmitter {
name: 'schedule',
data: [],
idIndex: null,
binaryIndices: {},
constraints: { unique: {}, exact: {} },
uniqueNames: [],
transforms: {},
objType: 'schedule',
dirty: true,
cachedIndex: null,
cachedBinaryIndex: null,
cachedData: null,
adaptiveBinaryIndices: true,
transactional: false,
cloneObjects: false,
cloneMethod: 'parse-stringify',
asyncListeners: false,
disableMeta: false,
disableChangesApi: true,
disableDeltaChangesApi: true,
autoupdate: false,
serializableIndices: true,
disableFreeze: true,
ttl: { age: null, ttlInterval: null, daemon: null },
maxId: 0,
DynamicViews: [],
events: {
insert: [],
update: [],
'pre-insert': [],
'pre-update': [],
close: [],
flushbuffer: [],
error: [],
delete: [ [Function: deleteCallback] ],
warning: [ [Function (anonymous)] ]
},
changes: [],
dirtyIds: [],
observerCallback: [Function: observerCallback],
getChangeDelta: [Function: getChangeDelta],
getObjectDelta: [Function: getObjectDelta],
getChanges: [Function (anonymous)],
flushChanges: [Function: flushChanges],
setChangesApi: [Function (anonymous)],
isIncremental: undefined
}I believe that I'm getting this error due to method find is outside from addCollection. I think I have to create of a mock from LokiEventEmitter class with the find method, but I don't know how to do it.
Node.js version
20.5.1
Example code
No response
Operating system
Linux 6.2.0-31-generic #31~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Wed Aug 16 13:45:26 UTC 2 x86_64 x86_64 x86_64 GNU/Linux
Scope
Running tests with native test runner
Module and version
Not applicable.