What is the best way to conduct a dropdown-toggle operation test in angular 2 testing?

I've been attempting to test the dropdown-toggle functionality, but I haven't been successful in getting it to work. I've already included BsDropdownModule in the spec file. Note: My project is using ngx-bootstrap.

Here's the code snippet that I've experimented with:

HTML:

<div class="btnBox" dropdown placement="bottom right">
    <button class="btnIcon dropdown-toggle" dropdownToggle>
    </button>
    <ul class="btnOptionBox dropdown-menu dropdown-menu-right" *dropdownMenu>
       <li class="iconBtn" (click)="someFun()" type="button"><span>Edit</span></li>
       <li class="iconBtn" (click)="someFun1()" type="button"><span>Delete</span></li>
    </ul>
 </div>

Test Spec: 

it("When toggle option is clicked, options should be displayed",() => {
     fixture.detectChanges();
     let toggleButton = fixture.debugElement.queryAll(By.css('[dropdownToggle]'));
     toggleButton[0].nativeElement.click();
     fixture.detectChanges();
     /*Unable to access li tag directly. Hence, I'm referencing its parent*/
     let list = fixture.debugElement.queryAll(By.css('div.ellipsisBox'));  
     console.log(list[0]); /*Displays the list within the children array*/
     console.log(list[0].children);  /*Doesn't display the list*/
});

Could someone provide guidance on the correct approach to achieve this?

angularunit-testingtypescriptkarma-jasminengx-bootstrap

Answer №1

After some careful investigation, I was able to successfully resolve the issue at hand. It turned out to be a simple oversight on my part. The list's data is populated asynchronously, so I needed to incorporate fakeAsync and tick() methods after clicking the dropdown button. This ensured that the view was updated only after the data had been fully loaded into the list, addressing the root cause of the problem. Below is the revised code snippet:

it("Testing the display of options when toggle option is clicked", fakeAsync(() => {
     fixture.detectChanges();
     let toggleButton = fixture.debugElement.queryAll(By.css('[dropdownToggle]'));
     toggleButton[0].nativeElement.click();
     tick();
     fixture.detectChanges();
     let list = fixture.debugElement.queryAll(By.css('ul.btnOptionBox'));  
     console.log(list[0]);
}));

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