[215] fix lint errors

test/unit/db/repositories/channel.spec.js

 import { expect } from 'chai'
 import { describe, it, before, beforeEach, after, afterEach } from 'mocha'
-import { channelFactory, deepChannelFactory } from '../../../support/factories/channel'
+import { deepChannelFactory } from '../../../support/factories/channel'
 import { genPhoneNumber } from '../../../support/factories/phoneNumber'
 import { omit, keys, times, map } from 'lodash'
 import channelRepository, { isSysadmin } from '../../../../app/db/repositories/channel'

test/unit/db/repositories/invite.spec.js

@@ -14,7 +14,7 @@ import app from '../../../../app'
 import testApp from '../../../support/testApp'
 import dbService from '../../../../app/db'
 const {
-  job: { inviteExpiryInMillis, inviteDeletionInterval },
+  job: { inviteExpiryInMillis },
 } = require('../../../../app/config')
 
 describe('invite repository', () => {

test/unit/diagnostics.spec.js

@@ -5,13 +5,11 @@ import channelRepository from '../../app/db/repositories/channel'
 import metrics, { gauges } from '../../app/metrics'
 import signal from '../../app/signal'
 import { times, zip } from 'lodash'
-import { launchHealthcheckJob, respondToHealthcheck, sendHealthchecks } from '../../app/diagnostics'
+import { respondToHealthcheck, sendHealthchecks } from '../../app/diagnostics'
 import { channelFactory, deepChannelFactory } from '../support/factories/channel'
 import { sdMessageOf } from '../../app/signal/constants'
-import { wait } from '../../app/util'
 const {
-  job: { healthcheckInterval },
-  signal: { diagnosticsPhoneNumber, signaldStartupTime },
+  signal: { diagnosticsPhoneNumber },
 } = require('../../app/config')
 
 describe('diagnostics module', () => {