// SPDX-FileCopyrightText: Copyright Orangebot, Inc. and Medplum contributors
// SPDX-License-Identifier: Apache-2.0
import { invariant } from './invariant';
describe('invariant', () => {
test('succeeds with a truthy condition', () => {
expect(() => invariant(123)).not.toThrow();
});
test('throws with a falsey condition', () => {
expect(() => invariant(undefined)).toThrow();
expect(() => invariant(false)).toThrow();
expect(() => invariant(0)).toThrow();
expect(() => invariant(null)).toThrow();
});
test('can specify an error message', () => {
expect(() => invariant(null)).toThrow('Invariant violation');
expect(() => invariant(null, 'Something went wrong')).toThrow('Something went wrong');
});
test('refines types to exclude null and undefined values', () => {
const testTypeRefinement = (value: number | undefined | null): number => {
invariant(value);
return value;
};
const result: number = testTypeRefinement(123);
expect(result).toEqual(123);
});
});
