calckey/packages/backend/test/prelude/maybe.ts

19 lines
417 B
TypeScript

import * as assert from "assert";
import { just, nothing } from "../../src/prelude/maybe.js";
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);
});
});