[Solved] Uncaught TypeError: Cannot read property 'location' of undefined
![Cover Image for [Solved] Uncaught TypeError: Cannot read property 'location' of undefined](/_next/image?url=%2Fassets%2Fblog%2Fcovers%2FuseLocation_testcases-thump.jpg&w=3840&q=75)
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Uncaught TypeError: Cannot read property 'location' of undefined
It is a common error when you executing the test cases for useLocation in Jest. It is not like any other hooks since it is working with the router.('react-router-dom') it requres some extra input before running the test cases.
what is useLocation ?
This isbone react hook, this hook will returns the current location object. This can be useful if you'd like to perform some side effect whenever the current location changes.
import { useLocation } from 'react-router-dom'
Look at to the below sample test case snippet.
let consider useLocation has been used in the component SampleComponent and the below test case is for testing the component using mount function of enzyme
import React from 'react'
import { mount } from 'enzymme'
import SampleComponent from 'samplecomponent'
describe('Test SampleComponent', () => {
it('should load the Component', () => {
const elemment = mount(<SampleComponent />)
expect(element.html()).not.toBeNull()
})
})
the result of the above code will be failed and says Uncaught TypeError: Cannot read property 'location' of undefined
because the program have used useLocation and when writing test case for that component also need to provide the initial value
lets solve the issue by a simple step, that nothing but wrap the compoent with MemoryRouter.
import { MemoryRouter } from 'react-router'
then the program would be like this.
import React from 'react'
import { mount } from 'enzymme'
import { MemoryRouter } from 'react-router'
import SampleComponent from 'samplecomponent' // the component contains useLocation hook
describe('Test SampleComponent', () => {
it('should load the Component', () => {
const elemment = mount(
<MemoryRouter initialEntries={['/']}>
<SampleComponent />
</MemoryRouter>
)
expect(element.html()).not.toBeNull()
})
})
MemoryRouter is a wrapper function which will help us to provide the correct input to the useLocation hook of the component.
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