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Front-end frameworks, in general, are exploding in popularity, and Vue.js, in particular, has become one of the most popular ones.

As front-end frameworks continue to grow in usage, the ability to incorporate testing has become an essential feature. Ensuring the safety and security of your web applications is critical.

You can learn to test your Vue.js applications thoroughly using Jest with this interactive course.

You'll start by learning the simplest unit tests in Jest, and will gradually build up to more intricate tests of different Vue components. To give you practical front-end testing experience, you'll be running your tests on a predefined data rendering Vue.js application.

This course is essential for anyone looking to create robust and effective front-end tests for their Vue apps.

Testing Vue.js Components with Jest

Have you noticed that I didn't mention anything about the third test? To remember it, let's check it again:

it("should emit a contact-click with its id when the component is clicked", () => {
  const cmp = createContactBox(0, "John", "Doe", false);
  cmp.trigger("click");

  const payload = cmp.emitted("contact-click")[0][0];
  expect(payload).toBe(0);
});

In this case, when the component is clicked, it doesn't perform any action that changes the component state, which means that the rendering state won't change. We're just testing behavior here that has no effect on the rendering of the component.

For that reason, we can say that **snapshot testing is useful to check changes on the rendering state**. If the rendering state doesn't change, there is no way that snapshot testing can help us.

In this lesson, we will learn about the case in which Snapshot testing doesn't help at all.

When Snapshot Testing Doesn’t Help