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import React from 'react';
import { render, fireEvent } from '@testing-library/react';
import { act, renderHook } from '@testing-library/react-hooks';
import createStateContext from '../src/factory/createStateContext';
it('should create a hook and a provider', () => {
const [useSharedNumber, SharedNumberProvider] = createStateContext(0);
expect(useSharedNumber).toBeInstanceOf(Function);
expect(SharedNumberProvider).toBeInstanceOf(Function);
});
describe('when using created hook', () => {
it('should throw out of a provider', () => {
const [useSharedText] = createStateContext('init');
const { result } = renderHook(() => useSharedText());
expect(result.error).toEqual(new Error('useStateContext must be used inside a StateProvider.'));
});
const setUp = () => {
const [useSharedText, SharedTextProvider] = createStateContext('init');
const wrapper = ({ children }: { children?: React.ReactNode }) => (
<SharedTextProvider>{children}</SharedTextProvider>
);
return renderHook(() => useSharedText(), { wrapper });
};
it('should init state and updater', () => {
const { result } = setUp();
const [sharedText, setSharedText] = result.current;
expect(sharedText).toEqual('init');
expect(setSharedText).toBeInstanceOf(Function);
});
it('should update the state', () => {
const { result } = setUp();
const [, setSharedText] = result.current;
act(() => setSharedText('changed'));
const [sharedText] = result.current;
expect(sharedText).toEqual('changed');
});
});
describe('when using among multiple components', () => {
const [useSharedText, SharedTextProvider] = createStateContext('init');
const DisplayComponent = () => {
const [sharedText] = useSharedText();
return <p>{sharedText}</p>;
};
const UpdateComponent = () => {
const [, setSharedText] = useSharedText();
return (
<button type="button" onClick={() => setSharedText('changed')}>
UPDATE
</button>
);
};
it('should be in sync when under the same provider', () => {
const { baseElement, getByText } = render(
<SharedTextProvider>
<DisplayComponent />
<DisplayComponent />
<UpdateComponent />
</SharedTextProvider>
);
expect(baseElement.innerHTML).toBe(
'<div><p>init</p><p>init</p><button type="button">UPDATE</button></div>'
);
fireEvent.click(getByText('UPDATE'));
expect(baseElement.innerHTML).toBe(
'<div><p>changed</p><p>changed</p><button type="button">UPDATE</button></div>'
);
});
it('should be in update independently when under different providers', () => {
const { baseElement, getByText } = render(
<>
<SharedTextProvider>
<DisplayComponent />
</SharedTextProvider>
<SharedTextProvider>
<DisplayComponent />
<UpdateComponent />
</SharedTextProvider>
</>
);
expect(baseElement.innerHTML).toBe(
'<div><p>init</p><p>init</p><button type="button">UPDATE</button></div>'
);
fireEvent.click(getByText('UPDATE'));
expect(baseElement.innerHTML).toBe(
'<div><p>init</p><p>changed</p><button type="button">UPDATE</button></div>'
);
});
it('should not update component that do not use the state context', () => {
let renderCount = 0;
const StaticComponent = () => {
renderCount++;
return <p>static</p>;
};
const { baseElement, getByText } = render(
<>
<SharedTextProvider>
<StaticComponent />
<DisplayComponent />
<UpdateComponent />
</SharedTextProvider>
</>
);
expect(baseElement.innerHTML).toBe(
'<div><p>static</p><p>init</p><button type="button">UPDATE</button></div>'
);
fireEvent.click(getByText('UPDATE'));
expect(baseElement.innerHTML).toBe(
'<div><p>static</p><p>changed</p><button type="button">UPDATE</button></div>'
);
expect(renderCount).toBe(1);
});
it('should override initialValue', () => {
const { baseElement } = render(
<>
<SharedTextProvider>
<DisplayComponent />
</SharedTextProvider>
<SharedTextProvider initialValue={'other'}>
<DisplayComponent />
</SharedTextProvider>
</>
);
expect(baseElement.innerHTML).toBe('<div><p>init</p><p>other</p></div>');
});
});
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