File size: 5,110 Bytes
1e92f2d |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 |
import { act, renderHook } from '@testing-library/react-hooks';
import useCounter from '../src/useCounter';
const setUp = (initialValue?: number, max: number | null = null, min: number | null = null) =>
renderHook(() => useCounter(initialValue, max, min));
it('should init counter and utils', () => {
const { result } = setUp(5);
expect(result.current[0]).toBe(5);
expect(result.current[1]).toStrictEqual({
inc: expect.any(Function),
dec: expect.any(Function),
get: expect.any(Function),
set: expect.any(Function),
reset: expect.any(Function),
});
});
it('should init counter to 0 if not initial value received', () => {
const { result } = setUp();
expect(result.current[0]).toBe(0);
});
it('should init counter to negative number', () => {
const { result } = setUp(-2);
expect(result.current[0]).toBe(-2);
});
it('should get current counter', () => {
const { result } = setUp(5);
const { get } = result.current[1];
expect(get()).toBe(5);
});
it('should increment by 1 if not value received', () => {
const { result } = setUp(5);
const { get, inc } = result.current[1];
act(() => inc());
expect(result.current[0]).toBe(6);
expect(get()).toBe(6);
});
it('should increment by value received', () => {
const { result } = setUp(5);
const { get, inc } = result.current[1];
act(() => inc(9));
expect(result.current[0]).toBe(14);
expect(get()).toBe(14);
});
it('should decrement by 1 if not value received', () => {
const { result } = setUp(5);
const { get, dec } = result.current[1];
act(() => dec());
expect(result.current[0]).toBe(4);
expect(get()).toBe(4);
});
it('should decrement by value received', () => {
const { result } = setUp(5);
const { get, dec } = result.current[1];
act(() => dec(9));
expect(result.current[0]).toBe(-4);
expect(get()).toBe(-4);
});
it('should set to value received', () => {
const { result } = setUp(5);
const { get, set } = result.current[1];
act(() => set(17));
expect(result.current[0]).toBe(17);
expect(get()).toBe(17);
});
it('should reset to original value', () => {
const { result } = setUp(5);
const { get, set, reset } = result.current[1];
// set different value than initial one...
act(() => set(17));
expect(result.current[0]).toBe(17);
// ... and reset it to initial one
act(() => reset());
expect(result.current[0]).toBe(5);
expect(get()).toBe(5);
});
it('should reset and set new original value', () => {
const { result } = setUp(5);
const { get, set, reset } = result.current[1];
// set different value than initial one...
act(() => set(17));
expect(result.current[0]).toBe(17);
// ... now reset and set it to different than initial one...
act(() => reset(8));
expect(result.current[0]).toBe(8);
// ... and set different value than initial one again...
act(() => set(32));
expect(result.current[0]).toBe(32);
// ... and reset it to new initial value
act(() => reset());
expect(result.current[0]).toBe(8);
expect(get()).toBe(8);
});
it('should not exceed max value', () => {
const { result } = setUp(10, 5);
expect(result.current[0]).toBe(5);
const { get, inc, reset } = result.current[1];
act(() => reset(10));
expect(get()).toBe(5);
act(() => reset(4));
expect(get()).toBe(4);
act(() => inc());
expect(get()).toBe(5);
act(() => inc());
expect(get()).toBe(5);
});
it('should not exceed min value', () => {
const { result } = setUp(3, null, 5);
expect(result.current[0]).toBe(5);
const { get, dec, reset } = result.current[1];
act(() => reset(4));
expect(get()).toBe(5);
act(() => reset(6));
expect(get()).toBe(6);
act(() => dec());
expect(get()).toBe(5);
act(() => dec());
expect(get()).toBe(5);
});
describe('should `console.error` on unexpected inputs', () => {
it('on any of call parameters', () => {
const spy = jest.spyOn(console, 'error').mockImplementation(() => {});
// @ts-ignore
setUp(false);
expect(spy.mock.calls[0][0]).toBe('initialValue has to be a number, got boolean');
// @ts-ignore
setUp(10, false);
expect(spy.mock.calls[1][0]).toBe('max has to be a number, got boolean');
// @ts-ignore
setUp(10, 5, {});
expect(spy.mock.calls[2][0]).toBe('min has to be a number, got object');
spy.mockRestore();
});
it('on any of returned methods has unexpected input', () => {
const { result } = setUp(10);
const { inc, dec, reset } = result.current[1];
const spy = jest.spyOn(console, 'error').mockImplementation(() => {});
// @ts-ignore
act(() => inc(false));
expect(spy.mock.calls[0][0]).toBe(
'delta has to be a number or function returning a number, got boolean'
);
// @ts-ignore
act(() => dec(false));
expect(spy.mock.calls[1][0]).toBe(
'delta has to be a number or function returning a number, got boolean'
);
// @ts-ignore
act(() => reset({}));
expect(spy.mock.calls[2][0]).toBe(
'value has to be a number or function returning a number, got object'
);
spy.mockRestore();
});
});
|