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reducers.test.js
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reducers.test.js
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import {
addExpense,
removeExpense
} from './actions'
import expenses, {
initialState
} from './reducers'
describe('reducers', () => {
it('should be able to add expenses', () => {
const stateStep1 = expenses(initialState, addExpense({
id: 1,
amount: 20
}))
expect(stateStep1.expenses).toHaveLength(1)
expect(stateStep1.balance).toEqual(20)
const stateStep2 = expenses(stateStep1, addExpense({
id: 2,
amount: 10
}))
expect(stateStep2.expenses).toHaveLength(2)
expect(stateStep2.balance).toEqual(30)
})
it('should be able to remove expenses', () => {
const stateStep1 = expenses(initialState, addExpense({
id: 1,
amount: 55
}))
expect(stateStep1.expenses).toHaveLength(1)
expect(stateStep1.balance).toEqual(55)
const stateStep2 = expenses(stateStep1, addExpense({
id: 2,
amount: 36
}))
expect(stateStep2.expenses).toHaveLength(2)
expect(stateStep2.balance).toEqual(91)
const stateStep3 = expenses(stateStep2, removeExpense({
id: 1
}))
expect(stateStep3.expenses).toHaveLength(1)
expect(stateStep3.balance).toEqual(36)
})
it('should return the default state', () => {
expect(expenses()).toEqual(initialState)
})
})