我開始關注單元測試角度2應用程序,但即使在最簡單的示例中,我也陷入了困境。我只是想運行一個簡單的測試來查看它是否可行,基本上我想要的是將標題頁面中的值與測試中的值進行比較。單元測試錯誤:無法從同步測試中調用Promise.then
這是我得到的錯誤,但我沒有看到錯誤來自哪裏,因爲一切看起來都與我同步。
Error: Error: Cannot call Promise.then from within a sync test.
單元測試:
import { ComponentFixture, TestBed } from '@angular/core/testing';
import { By } from '@angular/platform-browser';
import { DebugElement, Input} from '@angular/core';
import { ToDoComponent } from './todo.component';
import { FormsModule } from '@angular/forms';
describe(("test input "),() => {
let comp: ToDoComponent;
let fixture: ComponentFixture<ToDoComponent>;
let de: DebugElement;
let el: HTMLElement;
beforeEach(() => {
TestBed.configureTestingModule({
declarations: [ ToDoComponent ],
imports: [ FormsModule ]
})
.compileComponents();
});
fixture = TestBed.createComponent(ToDoComponent);
comp = fixture.componentInstance;
de = fixture.debugElement.query(By.css("h1"));
el = de.nativeElement;
it('should display a different test title',() => {
comp.pageTitle = 'Test Title';
fixture.detectChanges();
expect(el.textContent).toBe('Test Title423');
});
});
我的組件:內部beforeEach
import {Component} from "@angular/core";
import {Note} from "app/note";
@Component({
selector : "toDoArea",
templateUrl : "todo.component.html"
})
export class ToDoComponent{
pageTitle : string = "Test";
noteText : string ="";
noteArray : Note[] = [];
counter : number = 1;
removeCount : number = 1;
addNote() : void {
if (this.noteText.length > 0){
var a = this.noteText;
var n1 : Note = new Note();
n1.noteText = a;
n1.noteId = this.counter;
this.counter = this.counter + 1;
this.noteText = "";
this.noteArray.push(n1);
}
}
removeNote(selectedNote : Note) :void{
this.noteArray.splice(this.noteArray.indexOf(selectedNote),this.removeCount);
}
}
你'beforeEach'設置功能不應該包含'it'測試功能。 –