import createStore from '../../utility/algorithm/mini-redux/index';
describe('MiniRedux', () => {
interface IStaticState {
count: number;
};
interface IStaticAction {
type: string;
};
const initialState: IStaticState = {
count: 0,
};
const reducer = (state: IStaticState, action: IStaticAction) => {
switch (action.type) {
case 'INCREMENT': {
return {
...state,
count: ++state.count,
};
};
case 'DECREMENT': {
return {
...state,
count: --state.count,
};
};
default: {
return state
};
}
}
const store = createStore<IStaticState, IStaticAction>(reducer, initialState);
test('The method `store.getState()` should work fine', () => {
const state = store.getState();
expect(state.count).toBe(0);
});
test('The method `store.dispatch()` should work fine`', () => {
store.dispatch({
type: 'INCREMENT',
});
store.dispatch({
type: 'INCREMENT',
});
store.dispatch({
type: 'INCREMENT',
});
store.dispatch({
type: 'DECREMENT',
});
expect(store.getState().count).toBe(2);
});
test('The method `store.subscribe()` should work fine', () => {
let index = 0;
store.subscribe(() => {
++index;
});
store.dispatch({
type: 'DECREMENT',
});
store.dispatch({
type: 'DECREMENT',
});
expect(index).toBe(2);
expect(store.getState().count).toBe(0);
});
});
