File size: 1,234 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 | import { invariant } from '../invariant';
describe('invariant', () => {
if (!__DEV__) {
test('throws a generic invariant violation in production', () => {
expect(() => {
invariant(false, 'invariant');
}).toThrow('Invariant failed');
});
test('does not throw when the condition is met in production', () => {
expect(() => {
invariant(true, 'invariant');
}).not.toThrow();
});
}
if (__DEV__) {
test('throws when the condition is unmet', () => {
expect(() => {
invariant(false, 'invariant');
}).toThrow('[InstantSearch] invariant');
});
test('does not throw when the condition is met', () => {
expect(() => {
invariant(true, 'invariant');
}).not.toThrow();
});
test('lazily instantiates message', () => {
const spy1 = jest.fn(() => 'invariant');
const spy2 = jest.fn(() => 'invariant');
expect(() => {
invariant(false, spy1);
}).toThrow('[InstantSearch] invariant');
expect(spy1).toHaveBeenCalledTimes(1);
expect(() => {
invariant(true, spy2);
}).not.toThrow('[InstantSearch] invariant');
expect(spy2).not.toHaveBeenCalled();
});
}
});
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