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

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);
	});
});