FoundKey/test/prelude/maybe.ts
2021-08-19 11:26:26 +09:00

18 lines
414 B
TypeScript

import * as assert from 'assert';
import { just, nothing } from '../../src/prelude/maybe';
describe('just', () => {
it('has a value', () => {
assert.deepStrictEqual(just(3).isJust(), true);
});
it('has the inverse called get', () => {
assert.deepStrictEqual(just(3).get(), 3);
});
});
describe('nothing', () => {
it('has no value', () => {
assert.deepStrictEqual(nothing().isJust(), false);
});
});