guarded-array.js

"use strict";

const expect = require("chai").expect;

const dm = require("../src");

let User = dm.createType("User", {
	messages: dm.arrayOf(dm.string())
});

describe("guarded arrays", () => {
	let joe = User({
		messages: []
	});

	it("should accept valid values", () => {
		joe.messages.push("Hello world!");
		expect(joe.messages[0]).to.equal("Hello world!");

		joe.messages.splice(0, 0, "Hello earth!")
		expect(joe.messages[0]).to.equal("Hello earth!");
		expect(joe.messages[1]).to.equal("Hello world!");

		joe.messages[0] = "Hello moon!";
		console.log(joe.messages);
		expect(joe.messages[0]).to.equal("Hello moon!");
		expect(joe.messages[1]).to.equal("Hello world!");
	});

	it("should reject invalid values", () => {
		expect(() => {
			joe.messages.push(42);
		}).to.throw("Expected a string, got a number instead");

		expect(() => {
			joe.messages.splice(0, 0, 43);
		}).to.throw("Expected a string, got a number instead");

		expect(() => {
			joe.messages[0] = 44;
		}).to.throw("Expected a string, got a number instead");

		expect(joe.messages[0]).to.equal("Hello moon!");
		expect(joe.messages[1]).to.equal("Hello world!");
	});
});