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cherrypick/packages/backend/test/prelude/maybe.ts
2023-02-02 18:18:25 +09:00

19 lines
428 B
TypeScript

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