Learning Redux

Arrays

Jest provides a special matcher to check if an array contains an item: toContain, for example:

const arr = [1, 2, 3]test('array contains 2', () => {  expect(arr).toContain(2)})

If you want to check if an array contains a certain object, you have to use toContainEqual,; for example:

const arr = [{ name: 'dan' }, { name: 'des' }]test('array contains dan', () => {  expect(arr).toContainEqual({ name: 'dan' })})