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test.js
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test.js
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import Immutable from 'seamless-immutable';
import createReducer from '.';
const initialState = {
count: 0
};
const setUp = {
state: null
};
const actions = { DECREMENT: 'decrement', INCREMENT: 'increment', DUMMY: 'dummy' };
const dummyAction = { type: actions.DUMMY };
const decrementAction = { type: actions.DECREMENT, target: 'count' };
const incrementAction = { type: actions.INCREMENT, target: 'count' };
beforeEach(() => {
setUp.state = Immutable(initialState);
});
describe('createReducer', () => {
it('Throws if no reducer description is passed', () => {
expect(() => createReducer({})).toThrowError(new Error('reducerDescription is required'));
});
it('Throws if a non object reducer description is passed', () => {
expect(() => createReducer({}, null)).toThrowError(new Error('reducerDescription should be an object'));
expect(() => createReducer({}, [])).toThrowError(new Error('reducerDescription should be an object'));
});
it('Initializes state correctly', () => {
const reducerDescription = {};
const reducer = createReducer(setUp.state, reducerDescription);
expect(reducer(setUp.state, dummyAction).count).toBe(setUp.state.count);
});
it('Does not handle unknown actions', () => {
const reducerDescription = {
[actions.INCREMENT]: state => state.merge({ count: state.count + 1 })
};
const reducer = createReducer(setUp.state, reducerDescription);
setUp.state = reducer(setUp.state, incrementAction);
setUp.state = reducer(setUp.state, decrementAction);
setUp.state = reducer(setUp.state, incrementAction);
expect(setUp.state.count).toBe(2);
});
it('Does handle multiple actions', () => {
const reducerDescription = {
[actions.INCREMENT]: state => state.merge({ count: state.count + 1 }),
[actions.DECREMENT]: state => state.merge({ count: state.count - 1 })
};
const reducer = createReducer(setUp.state, reducerDescription);
setUp.state = reducer(setUp.state, incrementAction);
setUp.state = reducer(setUp.state, decrementAction);
setUp.state = reducer(setUp.state, incrementAction);
expect(setUp.state.count).toBe(1);
});
});