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test(invariant): add invariant test code (#789)
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Gromit (전민재) 2024-11-10 15:45:12 +09:00 committed by GitHub
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commit 087a9827d4
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1 changed files with 11 additions and 1 deletions
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src/util/invariant.spec.ts
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@ -1,4 +1,4 @@
import { describe, expect, it } from 'vitest';
import { describe, expect, expectTypeOf, it } from 'vitest';
import { invariant } from './invariant';
describe('invariant', () => {
@ -30,4 +30,14 @@ describe('invariant', () => {
const number = -1;
expect(() => invariant(number > 0, 'Number must be positive')).toThrow('Number must be positive');
});
it('should assert non-null value and treat it as string', () => {
const value = 'es-toolkit' as string | null;
invariant(value !== null, 'Value should not be null');
// Narrow the type.
expect(value.length).toBe(10);
expectTypeOf(value).toEqualTypeOf<string>();
});
});