Learning Redux

Initializing state with beforeEach()

Because we do not want to initialize the state manually in each test, we can use the beforeEach() helper to reset the state before each test runs:

1. First, we store the state in a variable outside of all the functions so that we can access it across our test functions and beforeEach. Edit __tests__/reducers/filter.test.js and add the following code after the import statements:

let state

2. Next, we use the beforeEach() helper to initialize the state the same way we did before:

beforeEach(() => {  state = filterReducer(undefined, {})})

3. Now, we can adjust the initial state test to look as follows:

test('initial state should be false (no filter)', () => {  expect(state).toBe(false)})