How Jasmine simulates the parentElement

Hey there, I'm facing an issue with my test and I can't figure out how to solve it. I'm using Jasmine with Angular.

In a directive, I need to access the parentNode of an element but the test keeps failing. Does anyone have any suggestions on how to mock this?

https://i.sstatic.net/D5J2W.png

Here's the code snippet:

private getParentElement() {
    return this.element.nativeElement.closest('th');
  }

  private setActiveSortingCellOnLoad(): void {
    const selectors = "[name='arrows-sort-down'] , [name='arrows-sort-up']";
    const headerCells = this.getParentElement().parentElement.childNodes;
    headerCells.forEach(cell => {
      if (cell.childNodes.length > 0) {
        const el = cell.querySelectorAll(selectors);
        if (el.length === 1) {
          cell.classList.add(this.activeSortClass);
        }
      }
    });
  }

Answer №1

To access the private method getParentElement, we need to use a workaround in our testing strategy.

Give this a try:

it('tests abc', () => {
  spyOn((component as any), 'getParentElement').and.returnValue({ parentElement: { childNodes: [/* mock childNodes here */ ]}});
});

The workaround involves using component as any to bypass the inability to spy on private methods. It's a bit of a hack, but should do the trick in this scenario.

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