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import { renderHook, act } from '@testing-library/react-hooks';
import { useMethods } from '../src';
it('should have initialState value as the returned state value', () => {
const initialState = {
count: 10,
};
const createMethods = (state) => ({
doStuff: () => state,
});
const { result } = renderHook(() => useMethods(createMethods, initialState));
expect(result.current[0]).toEqual(initialState);
});
it('should return wrappedMethods object containing all the methods defined in createMethods', () => {
const initialState = {
count: 10,
};
const createMethods = (state) => ({
reset() {
return initialState;
},
increment() {
return { ...state, count: state.count + 1 };
},
decrement() {
return { ...state, count: state.count - 1 };
},
});
const { result } = renderHook(() => useMethods(createMethods, initialState));
for (const key of Object.keys(createMethods(initialState))) {
expect(result.current[1][key]).toBeDefined();
}
});
it('should properly update the state based on the createMethods', () => {
const count = 10;
const initialState = {
count,
};
const createMethods = (state) => ({
reset() {
return initialState;
},
increment() {
return { ...state, count: state.count + 1 };
},
decrement() {
return { ...state, count: state.count - 1 };
},
});
const { result } = renderHook(() => useMethods(createMethods, initialState));
act(() => {
result.current[1].increment();
});
expect(result.current[0].count).toBe(count + 1);
act(() => {
result.current[1].decrement();
});
expect(result.current[0].count).toBe(count);
act(() => {
result.current[1].decrement();
});
expect(result.current[0].count).toBe(count - 1);
act(() => {
result.current[1].reset();
});
expect(result.current[0].count).toBe(count);
});
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