VueJS Unit Testing: Exploring the Content of Attributes- What to Test?

I'm currently facing some challenges with my initial VueJS unit tests using Jest.

Although I grasp the concept and have already executed my first set of successful tests, I find myself pondering over the question of "What aspects should I test?"

For instance, within my Component, there exists an element:

<img v-if="!hasHoverEffect"
     :alt="model.alt"
     :src="src"
     :style="styles"
     :title="model.title"
     :class="model.shadow"
     class="img-fluid centered"/>

The dilemma lies in determining what precisely to evaluate here. As of now, I've drafted 2 tests:

test('renders by default', () => {
  const wrapper = factory.default();
  const img = wrapper.find('div.position-relative > img');
  expect(img.element).toBeDefined();
});

test('does not render if model.hovereffect is true', () => {
  const wrapper = factory.default({
    propsData: {
      model: {
        hovereffect: 'true'
      }
    }
  });
  const img = wrapper.find('div.position-relative > img');
  expect(img.element).not.toBeDefined();
});

Contemplating whether the next step should involve

test('by default alt is empty', () => {
, or does this venture into an area that's unnecessary as it delves more into testing VueJS functionality rather than focusing on my specific component?

Answer №1

When considering testing my component, I always make sure to prioritize the key elements that need to be covered. In most cases, including yours, these two questions are sufficient:

  1. Is the component rendering correctly?
  2. Is the behavior as expected?

While it's tempting to write extensive tests for every possible scenario, I believe it's unnecessary. The tests you have done already address these crucial points effectively. Adding another test just to check the alt tag may be excessive.

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