29 lines
886 B
JavaScript
29 lines
886 B
JavaScript
import { reducer } from './reducer';
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describe('reducer', () => {
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it('should return the initial state', () => {
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const initialState = { count: 0 };
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expect(reducer()).toEqual(initialState);
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});
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it('should handle decrement action', () => {
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const initialState = { count: 0 };
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const action = { type: 'increment' };
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const expectedState = { count: 1 };
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expect(reducer(initialState, action)).toEqual(expectedState);
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});
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it('should handle increment action', () => {
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const initialState = { count: 1 };
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const action = { type: 'decrement' };
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const expectedState = { count: 0 };
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expect(reducer(initialState, action)).toEqual(expectedState);
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});
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it('should handle unknown action', () => {
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const initialState = { count: 0 };
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const action = { type: 'UNKNOWN' };
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expect(reducer(initialState, action)).toEqual(initialState);
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});
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});
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