How to use the @ng-dynamic-forms/core.DynamicCheckboxGroupModel function in @ng-dynamic-forms/core

describe("DynamicKendoCheckboxGroupComponent test suite", () => {

    let testModel = new DynamicCheckboxGroupModel({id: "checkboxGroup", group: []}),
        formModel = [testModel],
        formGroup: FormGroup,
        fixture: ComponentFixture,
        component: DynamicKendoCheckboxGroupComponent,
        debugElement: DebugElement,
        testElement: DebugElement;

    beforeEach(async(() => {

        TestBed.configureTestingModule({

            imports: [
                ReactiveFormsModule,
                NoopAnimationsModule,
                TextMaskModule,
                DynamicFormsCoreModule

describe("DynamicNGxBootstrapCheckboxGroupComponent test suite", () => {

    let testModel = new DynamicCheckboxGroupModel({id: "checkboxGroup", group: []}),
        formModel = [testModel],
        formGroup: FormGroup,
        fixture: ComponentFixture,
        component: DynamicNGxBootstrapCheckboxGroupComponent,
        debugElement: DebugElement,
        testElement: DebugElement;

    beforeEach(async(() => {

        TestBed.configureTestingModule({

            imports: [
                ReactiveFormsModule,
                NoopAnimationsModule,
                TextMaskModule,
                ButtonsModule,

describe("DynamicNGBootstrapCheckboxGroupComponent test suite", () => {

    let testModel = new DynamicCheckboxGroupModel({id: "checkboxGroup", group: []}),
        formModel = [testModel],
        formGroup: FormGroup,
        fixture: ComponentFixture,
        component: DynamicNGBootstrapCheckboxGroupComponent,
        debugElement: DebugElement,
        testElement: DebugElement;

    beforeEach(async(() => {

        TestBed.configureTestingModule({

            imports: [
                ReactiveFormsModule,
                NoopAnimationsModule,
                TextMaskModule,
                NgbButtonsModule,