Learning Redux

Testing the clearFilter action

Because the initial state is false (which is also the result of the clearFilter action), we first need to dispatch a setFilter action and ensure the state was changed. Then, we dispatch the clearFilter action and ensure the state is false again:

1. We start by setting a filter, just like in the previous test. Edit __tests__/reducers/filter.test.js and add the following code:

test('clearFilter action should reset filter state', () => {  const category = 'test'  state = filterReducer(state, setFilter(category))  expect(state).toBe(category)

2. Then, we create the clearFilter action, pass it to the reducer function, and ensure the state is false again:

  const action = clearFilter() state = filterReducer(state, action) ...