我有一个采用模板驱动形式的组件
<form (ngSubmit)="onSearchCorpus(form)" #form="ngForm">
<combo-box [(ngModel)]="model.corpus" name="corpus" #corpus="ngModel"></combo-box>
<input [(ngModel)]="model.label" name="label" id="label" type="text" required pattern="^(?!\s*$)[\w\_\-\:\s]*" maxlength="50" class="form-control label-name" autocomplete="off" #label="ngModel">
<textarea [(ngModel)]="model.query" name="query" id="query" maxlength="3600" required validateQuerySyntax class="form-control search-query" #query="ngModel" #queryControl
placeholder="Example: ("grantee" OR "grant" OR "sponsor" OR "contribute" OR "contributor") NEAR ("non-profit organization" OR "charities")">
</textarea>
<button [disabled]="corpusValidationInProgress" type="submit" class="button-level-one">Search</button>
</form>
在处理表单提交的方法中,我访问NgForm实例的controls属性,它在浏览器中工作正常。
onSearchCorpus(formData: NgForm) {
...
const corpusErrors = formData.controls.corpus.errors;
...
}
但是当我尝试使用Karma测试此方法时,NgForm的controls
属性为空。我很困惑为什么会这样。该方法失败,错误为cannot read property "errors" of undefined
。
以下是我的测试结果:
it('should not perform corpusSearch if selected corpus no longer exists', () => {
component.ngOnInit();
const form = fixture.debugElement.query(By.css('form'));
form.triggerEventHandler('submit', null);
...
});
这就是我设置测试服的方式:
beforeEach(async(() => {
TestBed.configureTestingModule({
// schemas: [NO_ERRORS_SCHEMA],
imports: [
FormsModule,
PopoverModule
],
providers: [
CorpusSearchService,
{ provide: ApiService, useValue: ApiServiceStub },
{ provide: Router, useClass: RouterStab },
],
declarations: [
SearchCorpusComponent, //<--component under test
ComboBoxComponent //<-- 3rd party combobox which is used for first control
]
}).compileComponents();
}));
beforeEach(() => {
fixture = TestBed.createComponent(SearchCorpusComponent);
component = fixture.componentInstance;
apiService = fixture.debugElement.injector.get(ApiService);
subject = new Subject();
});
那么,为什么controls
在测试环境中为空?
答案 0 :(得分:6)
java.lang.NoClassDefFoundError: com/google/common/primitives/Ints
为&#34;空的原因&#34;在测试环境中,控件没有被初始化&#34;然而&#34;在调用controls
时的测试环境中。
我已准备好Plunkr(请参阅onSearchCorpus
文件)来演示此问题。在同一个文件中,还有一个可行的解决方案。
简而言之,为了完成这项工作,您需要使用form.component.spec
机制。
所以而不是:
fakeAsync
你应该写一个像以下的测试:
it('testing form the wrong way', () => {
fixture.detectChanges();
comp.onSubmit(); // Validates and submits a form
expect(comp.submitted).toEqual(false);
});