Sharkey/test/prelude/maybe.ts
2020-03-07 00:12:23 +09:00

28 lines
756 B
TypeScript

/*
* Tests of Maybe
*
* How to run the tests:
* > npx cross-env TS_NODE_FILES=true TS_NODE_TRANSPILE_ONLY=true npx mocha test/prelude/maybe.ts --require ts-node/register
*
* To specify test:
* > npx cross-env TS_NODE_FILES=true TS_NODE_TRANSPILE_ONLY=true npx mocha test/prelude/maybe.ts --require ts-node/register -g 'test name'
*/
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);
});
});