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state.test.ts
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state.test.ts
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import { renderHook, act } from '@testing-library/react-hooks';
import { useStorageState } from '..';
import {
mockStorageError,
mockStorageErrorOnce,
fireStorageEvent,
} from './utils';
afterEach(() => {
localStorage.clear();
jest.restoreAllMocks();
});
describe('initialization', () => {
it.only('returns storage value when available', async () => {
localStorage.setItem('key', '{"value":1}');
const { result, waitForNextUpdate } = renderHook(() =>
useStorageState(localStorage, 'key', { value: 0 })
);
const {
state: beforeUpdateState,
isLoading: beforeUpdateIsLoading,
isError: beforeUpdateIsError,
} = result.current;
expect(beforeUpdateIsLoading).toBe(true)
expect(beforeUpdateIsError).toBe(false)
expect(beforeUpdateState).toBeUndefined()
await waitForNextUpdate();
const {
state: afterUpdateState,
isLoading: afterUpdateIsLoading,
isError: afterUpdateIsError,
} = result.current;
expect(afterUpdateIsLoading).toBe(false)
expect(afterUpdateIsError).toBe(false)
expect(afterUpdateState).toStrictEqual({ value: 1 });
});
it('returns default state when storage empty and writes it to storage', async () => {
const { result, waitForNextUpdate } = renderHook(() =>
useStorageState(localStorage, 'key', { value: 0 })
);
await waitForNextUpdate();
const { state } = result.current;
expect(state).toStrictEqual({ value: 0 });
expect(localStorage.getItem('key')).toBe('{"value":0}');
});
it('returns default state when storage empty and writes it to storage (lazy initialization)', async () => {
const { result, waitForNextUpdate } = renderHook(() =>
useStorageState(localStorage, 'key', () => ({ value: 0 }))
);
await waitForNextUpdate();
const { state } = result.current;
expect(state).toStrictEqual({ value: 0 });
expect(localStorage.getItem('key')).toBe('{"value":0}');
});
it('returns null when storage empty and no default provided', async () => {
const { result, waitForNextUpdate } = renderHook(() => useStorageState(localStorage, 'key'));
await waitForNextUpdate();
const { state } = result.current;
expect(state).toBeNull();
});
it('returns default state when storage reading fails', async () => {
mockStorageErrorOnce(localStorage, 'getItem', 'Error message');
localStorage.setItem('key', '{"value":1}');
const { result, waitForNextUpdate } = renderHook(() =>
useStorageState(localStorage, 'key', { value: 0 })
);
await waitForNextUpdate();
const {
current: { state },
} = result;
expect(state).toStrictEqual({ value: 0 });
});
it('returns null when storage reading fails and no default provided', () => {
mockStorageErrorOnce(localStorage, 'getItem', 'Error message');
localStorage.setItem('key', '{"value":1}');
const { result } = renderHook(() => useStorageState(localStorage, 'key'));
const {
current: { state },
} = result;
expect(state).toBeNull();
});
});
describe('updates', () => {
it.only('returns new state and writes to storage', () => {
const { result } = renderHook(() =>
useStorageState(localStorage, 'key', { value: 0 })
);
const { setState } = result.current;
act(() => setState({ value: 1 }));
const { state: newState } = result.current;
expect(newState).toStrictEqual({ value: 1 });
expect(localStorage.getItem('key')).toBe('{"value":1}');
});
it('returns new state and write error when storage writing fails once', async () => {
mockStorageErrorOnce(localStorage, 'setItem', 'Error message');
const { result, waitForNextUpdate } = renderHook(() =>
useStorageState(localStorage, 'key', { value: 0 })
);
const { setState } = result.current;
act(() => setState({ value: 1 }));
await waitForNextUpdate();
const { state: newState, error: writeError } = result.current;
expect(newState).toStrictEqual({ value: 1 });
expect(writeError).toEqual(Error('Error message'));
});
it('returns new state and previous write error when storage writing fails multiple times', async () => {
mockStorageError(localStorage, 'setItem', 'Error message');
const { result, waitForNextUpdate } = renderHook(() =>
useStorageState(localStorage, 'key', { value: 0 })
);
const { setState } = result.current;
act(() => setState({ value: 1 }));
await waitForNextUpdate();
const { setState: newSetState, error: writeError } = result.current;
expect(writeError).toEqual(Error('Error message'));
act(() => newSetState({ value: 2 }));
await waitForNextUpdate();
const { error: newWriteError } = result.current;
expect(newWriteError).toEqual(Error('Error message'));
});
it('returns new state and no previous write error when storage writing works after failing', async () => {
mockStorageErrorOnce(localStorage, 'setItem', 'Error message');
const { result, waitForNextUpdate } = renderHook(() =>
useStorageState(localStorage, 'key', { value: 0 })
);
const { setState } = result.current;
act(() => setState({ value: 1 }));
await waitForNextUpdate();
const { setState: newSetState, error: writeError } = result.current;
expect(writeError).toEqual(Error('Error message'));
act(() => newSetState({ value: 2 }));
const { error: newWriteError } = result.current;
expect(newWriteError).toBeUndefined();
});
it('returns same state when default state changes', () => {
localStorage.setItem('key', '{"value":1}');
const { result, rerender } = renderHook(
defaultState => useStorageState(localStorage, 'key', defaultState),
{ initialProps: { value: 0 } }
);
rerender({ value: 2 });
const { state: newState } = result.current;
expect(newState).toStrictEqual({ value: 1 });
});
it('returns same state when storage empty and default state changes', () => {
const { result, rerender } = renderHook(
defaultState => useStorageState(localStorage, 'key', defaultState),
{ initialProps: { value: 0 } }
);
rerender({ value: 1 });
const { state: newState } = result.current;
expect(newState).toStrictEqual({ value: 0 });
});
it('returns null and removes key from storage when null provided', () => {
localStorage.setItem('key', '{"value":1}');
const { result } = renderHook(() =>
useStorageState<{ value: number } | null>(localStorage, 'key', {
value: 0,
})
);
const { setState } = result.current;
act(() => setState(null));
const { state: newState } = result.current;
expect(newState).toBeNull();
expect(localStorage.getItem('key')).toBeNull();
});
it('returns new state when storage event fired for key', () => {
const { result } = renderHook(() =>
useStorageState(localStorage, 'key', 0)
);
act(() => fireStorageEvent('key', '{"value":1}'));
const { state: newState } = result.current;
expect(newState).toStrictEqual({ value: 1 });
});
it('returns same state when storage event fired for key and storage empty', () => {
const { result } = renderHook(() =>
useStorageState(localStorage, 'key', { value: 0 })
);
act(() => fireStorageEvent('key', null));
const { state: newState } = result.current;
expect(newState).toStrictEqual({ value: 0 });
});
it('returns same state when storage event fired for other key', () => {
const { result } = renderHook(() =>
useStorageState(localStorage, 'key', { value: 0 })
);
act(() => {
fireStorageEvent('other-key', '{"value":1}');
});
const { state: newState } = result.current;
expect(newState).toStrictEqual({ value: 0 });
});
});
describe('resetting', () => {
it('returns new storage value when key changes and storage value available', () => {
localStorage.setItem('new-key', '{"value":1}');
const { result, rerender } = renderHook(
key => useStorageState(localStorage, key, { value: 0 }),
{
initialProps: 'key',
}
);
rerender('new-key');
const { state: newState } = result.current;
expect(newState).toStrictEqual({ value: 1 });
});
it('returns default state when key changes and storage empty', () => {
localStorage.setItem('key', '1');
const { result, rerender } = renderHook(
key => useStorageState(localStorage, key, { value: 0 }),
{
initialProps: 'key',
}
);
rerender('new-key');
const { state: newState } = result.current;
expect(newState).toStrictEqual({ value: 0 });
});
it('returns null when key changes, storage empty and no default provided', () => {
localStorage.setItem('key', '{"value":1}');
const { result, rerender } = renderHook(
key => useStorageState(localStorage, key),
{
initialProps: 'key',
}
);
rerender('new-key');
const { state: newState } = result.current;
expect(newState).toBeNull();
});
it('returns no previous write error when key changes', async () => {
mockStorageErrorOnce(localStorage, 'setItem', 'Error message');
const { result, rerender, waitForNextUpdate } = renderHook(
key => useStorageState(localStorage, key, { value: 0 }),
{ initialProps: 'key' }
);
const { setState } = result.current;
act(() => setState({ value: 1 }));
await waitForNextUpdate();
const { error: writeError } = result.current;
expect(writeError).toEqual(Error('Error message'));
rerender('new-key');
const { error: newWriteError } = result.current;
expect(newWriteError).toBeUndefined();
});
it('writes to new key when key changes', () => {
localStorage.setItem('key', '{"value":1}');
localStorage.setItem('new-key', '{"value":2}');
const { result, rerender } = renderHook(
key => useStorageState(localStorage, key, { value: 0 }),
{
initialProps: 'key',
}
);
rerender('new-key');
const { setState } = result.current;
act(() => setState({ value: 3 }));
expect(localStorage.getItem('key')).toBe('{"value":1}');
expect(localStorage.getItem('new-key')).toBe('{"value":3}');
});
});