it('Should increment the state by the action payload\'s "value" property.', () => {
let state = counterReducer(undefined, {})
expect(state).to.equal(0)
state = counterReducer(state, increment(1))
expect(state).to.equal(1)
state = counterReducer(state, increment(2))
expect(state).to.equal(3)
state = counterReducer(state, increment(-3))
expect(state).to.equal(0)
})
it('Should return the previous state if an action was not matched.', () => {
let state = counterReducer(undefined, {})
expect(state).to.equal(0)
state = counterReducer(state, {type: '@@@@@@@'})
expect(state).to.equal(0)
state = counterReducer(state, increment(5))
expect(state).to.equal(5)
state = counterReducer(state, {type: '@@@@@@@'})
expect(state).to.equal(5)
})
it('Should default the "payload" property to 1 if not provided.', () => {
expect(increment()).to.have.property('payload', 1)
})
it('Should assign the first argument to the "payload" property.', () => {
expect(increment(5)).to.have.property('payload', 5)
})
it('Should return an action with type "COUNTER_INCREMENT".', () => {
expect(increment()).to.have.property('type', COUNTER_INCREMENT)
})