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

Core for bot

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

describe("doubleComputed", function() {
	it("should compute in both directions", checkRefs(function() {
		var x = rp.variable(6);
		var y = x.computed(function(x) {
			return x * 2;
		}, function(y) {
			return y / 2;
		});
		y().should.be.eql(12);
		x().should.be.eql(6);
		x.set(4);
		y().should.be.eql(8);
		x().should.be.eql(4);
		y.set(10);
		y().should.be.eql(10);
		x().should.be.eql(5);
		rp.atomic(function() {
			x.set(100);
			x.set(102);
		});
		x().should.be.eql(102);
		y().should.be.eql(204);
	}));
	it("should not computed more often than required", checkRefs(function() {
		var x = rp.variable(6);
		var counter = 0;
		var counter2 = 0;
		var y = x.computed(function(x) {
			counter++;
			return x + 1;
		}, function(y) {
			counter2++;
			return y - 1;
		});
		counter.should.be.eql(1);
		counter2.should.be.eql(1);
		x.set(10);
		counter.should.be.eql(2);
		counter2.should.be.eql(2);
		y.set(11);
		counter.should.be.eql(2);
		counter2.should.be.eql(2);
		y.set(10);
		counter.should.be.eql(3);
		counter2.should.be.eql(3);
	}));
	it("should have helpers", checkRefs(function() {
		var x = rp.variable(123), y = rp.variable(123.456);
		var xx = x.asIntString();
		var yy = y.asFloatString();
		xx().should.be.eql("123");
		yy().should.be.eql("123.456");
		xx.set("789");
		yy.set("789.012");
		x().should.be.eql(789);
		y().should.be.eql(789.012);
	}));
});