What steps should I take to update my unit test in order to accurately validate the following scenario?
Method:
close(event) {
const element = !!event?.target?.closest('#target')
if (!element) {
this.isVisible = false
}
},
Jest test:
it('should change visibility to false if element is false', () => {
const wrapper = shallowMount(AccountLogin, { mocks })
wrapper.vm.close()
expect(wrapper.vm.$data.isVisible).toBe(false)
})
When the change() event occurs on the main element of your component, you can use this code:
jest.spyOn(wrapper, 'closest')
.mockImplementationOnce(() => true)
wrapper.vm.close()
expect(wrapper.vm.$data.isVisible).toBe(false)
If the event is triggered on a child element within the main component, you will have to specify that child in the spyOn function and mock its closest method instead of the main wrapper. For example:
jest.spyOn(wrapper.find('input'), 'closest')
.mockImplementationOnce(() => true)
// ...
The reason for finding the exact element is because jsdom does not fully replicate the actual DOM behavior and events do not bubble up.
What the above script accomplishes: it intercepts the .closest() method of the target element so that it returns true.
This action will result in
!!event?.target?.closest('#target')
returning true, which leads to execution of this.isVisible = true.
To ensure that this.isVisible remains false when #target cannot be found, create a second test with a .closest() mock returning
false</code. Verify that <code>isVisiblefalse to true after calling .close(). It's best to trust that the HTML functions correctly rather than extensively testing it.
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