Karma: NotSupportedError: screen.orientation.lock() is not available on this device

@jsteffen wrote:

I’ve been trying to get my unit tests in Karma to work but keep getting this error:

Uncaught Error: Uncaught (in promise): NotSupportedError: screen.orientation.lock() is not available on this device. thrown

I have tried creating a mock class for screen orientation but it doesn’t seem to work. Just interested in if anyone has experienced this problem before and found a way to fix this.

Here is my full spec file:

import { async, ComponentFixture, TestBed } from '@angular/core/testing'

import { ScreenOrientation } from "@ionic-native/screen-orientation"

import { HttpClientTestingModule } from '@angular/common/http/testing'

import { IonicStorageModule } from '@ionic/storage'

import { CUSTOM_ELEMENTS_SCHEMA, NO_ERRORS_SCHEMA } from '@angular/core'

import { Idle, IdleExpiry } from '@ng-idle/core'

import { Keepalive } from '@ng-idle/keepalive'

import { RouterTestingModule } from '@angular/router/testing'

import { BarcodeProvider } from './../../scripts/barcode'

import { oAuthService } from './../../scripts/oauth'

import { AlphaScanInputComponent } from './alpha-scan-input.component'

class ScreenOrientationMock extends ScreenOrientation {

  lock(type) {

    return new Promise((resolve, reject) => {

      resolve("locked");

    })

  }

}

describe('AlphaScanInputComponent', () => {

  let component: AlphaScanInputComponent

  let fixture: ComponentFixture<AlphaScanInputComponent>

  beforeEach(

    async( () => {

        TestBed.configureTestingModule({

            schemas: [ CUSTOM_ELEMENTS_SCHEMA, NO_ERRORS_SCHEMA ],

            declarations: [AlphaScanInputComponent],

            providers: [

              { provide: Idle, useClass: Idle },

              { provide: IdleExpiry, useClass: IdleExpiry },

              { provide: Keepalive, useClass: Keepalive },

              { provide: BarcodeProvider },

              { provide: oAuthService },

              { provide: ScreenOrientation, useClass: ScreenOrientationMock }

            ],

            imports: [

                RouterTestingModule.withRoutes([]),

                HttpClientTestingModule,

                IonicStorageModule.forRoot()

            ]

        }).compileComponents()

    })

)

beforeEach(() => {

    fixture = TestBed.createComponent(AlphaScanInputComponent)

    component = fixture.componentInstance

    fixture.detectChanges()

})

  it('should create', () => {

    expect(component).toBeTruthy()

  })

})

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