relu-core/modules/rp/test/computed.js

Core for bot

var should = require("should");
var rp = require("../");
var checkRefs = require("./checkRefs");

describe("computed", function() {
	it("should compute the value (very simple)", checkRefs(function() {
		var x = rp.variable("test");
		var counter = 0;
		var y = rp.computed(function() {
			return x() + (++counter);
		});
		y().should.be.eql("test1");
	}));
	it("should compute the value", checkRefs(function() {
		var x = rp.variable("test");
		var counter = 0;
		var y = rp.computed(function() {
			return x() + (++counter);
		});
		y.isWritable().should.be.eql(false);
		y().should.be.eql("test1");
		y().should.be.eql("test1");
		x.set("TEST");
		y().should.be.eql("TEST2");
		x.set("A");
		x.set("B");
		y().should.be.eql("B4");
		rp.atomic(function() {
			x.set("C");
			x.set("D");
		})
		y().should.be.eql("D5");
	}));
	it("should compute the value from a computed value", checkRefs(function() {
		var x1 = rp.variable("aa");
		var x2 = rp.variable("bb");
		var counter1 = 0;
		var counter2 = 0;
		var counter3 = 0;
		var y1 = x1.computed(function(x) {
			return x + (++counter1);
		}).scope();
		var y2 = rp.computed(function() {
			return x2() + (++counter2);
		});
		var z = rp.computed(function() {
			return y1() + y2() + "z" + (++counter3);
		});
		z().should.be.eql("aa1bb1z1");
		x1.add("a");
		x2.add("b");
		z().should.be.eql("aaa2bbb2z3");
		rp.atomic(function() {
			x1.add("A");
			x2.add("B");
		});
		z().should.be.eql("aaaA3bbbB3z4");
	}));
	it("should summarize changes in atomic", checkRefs(function() {
		var x = rp.variable({
			a: 1,
			b: 2
		});
		var y = rp.variable(3);
		var counter = 0;
		var z = rp.computed(function() {
			return x().a + "," + x("b")() + "," + y() + "," + (++counter);
		});
		z().should.be.eql("1,2,3,1");
		rp.atomic(function() {
			x.set({
				a: 10,
				b: 20
			});
			x("a").set(11);
			x("b").set(22);
			y.set(32);
			y.set(33);
		});
		z().should.be.eql("11,22,33,2");
	}));
	it("should fire correct events", checkRefs(function() {
		var y = rp.variable(1);
		var x = y.plus("test");
		var events = [];
		x.onChanged(function() {
			events.push("changed");
		});
		x.onUpdated(function(n, o) {
			events.push(["updated", n, o]);
		});
		x.onAdded(function(idx, i) {
			events.push(["added", idx, i]);
		});
		x.onRemoved(function(idx, i) {
			events.push(["removed", idx, i]);
		});
		y.set(2);
		events.shift().should.be.eql(["updated", "2test", "1test"]);
		events.shift().should.be.eql("changed");
		rp.atomic(function() {
			y.set(3);
			y.set(4);
		});
		events.shift().should.be.eql(["updated", "4test", "2test"]);
		events.shift().should.be.eql("changed");
	}));
});