it('returns a new todo', function() {
const stateBefore = undefined;
const action = {type: 'ADD_TODO', id: 0, text: 'Learn Redux'};
const stateAfter = {id: 0, text: 'Learn Redux', completed: false};
deepFreeze(action);
expect(todo(stateBefore, action)).to.deep.equal(stateAfter);
});
it('updates a todo', function() {
const stateBefore = {id: 0, text: 'Learn Redux', completed: false};
const action = {type: 'EDIT_TODO', id: 0, externalId: 13};
const stateAfter = {id: 0, text: 'Learn Redux', completed: false, externalId: 13};
deepFreeze(stateBefore);
deepFreeze(action);
expect(todo(stateBefore, action)).to.deep.equal(stateAfter);
});
it('toggles a todo\'s completed field', function() {
const action = { id: 1, type: 'TOGGLE_TODO' };
deepFreeze(action);
expect(todo(stateBefore, action)).to.deep.equal(stateAfter);
});