How to test drag and drop behavior with Angular and ng2FileDrop and Jest

Question

How can I simulate a drag and drop action with a ng2FileDrop to check the behavior of the addFile() method in my unit tests with Jest ?

Template with my ng2FileDrop :

    <div class="dropzone"
        ng2FileDrop [uploader]="fileUploader"
        [ngClass]="{'dropzone-file-over': hasBaseDropZoneOver }"
        (fileOver)="fileOverBase($event)"
        (onFileDrop)="addFile($event, 'drag-and-drop')"
        id="dropzone"
        [formControl]="controls.fileControl" ngDefaultControl>
        <div class="dropzone-content mb-2">Drag and drop your file</div>
    </div>

Component method to test:

  addFile(event, input: string): void {
    if (this.checkFile()) {
      this.fileUploader.uploadAll();
    } else {
      this.fileUploader.clearQueue();
      this.controls.fileControl.setValue(null);
      this.logService.error('File size is too big !');
    }
  }

  checkFile() {
    if (this.fileUploader.queue.length > 0) {
      return this.fileUploader.queue[0].file.size <= this.maxSize; //1 Ko
    }
    return false;
  }

Unit test :

    it('should display error when file size is too big', () => {
      Mock.extend(logService).with({ error: noop });
      const file = new File([''], 'temp.tmp');
      Object.defineProperty(file, 'size', { value: 999999999 });

      component.controls.fileControl.setValue(file);
      //component.fileUploader.addToQueue([file]); same behavior
      expect(component.uploadFormGroup.invalid).toEqual(false);
      fixture.detectChanges();

      //form validation button
      const buttonElements = fixture.debugElement.queryAll(By.css('.validation-btn'));
      buttonElements[1].nativeElement.click();
      fixture.detectChanges();

      expect(logService.error).toHaveBeenCalledWith('File size is too big !');
    });

    Expected: "File size is too big !"
    Received: "File uploaded !"

The test does not pass in the addFile() method, it behave like if the file was already correctly added.