var vows = require("vows"),

load = require("../load"),

assert = require("../assert");

var suite = vows.describe("d3.interpolateObject");

suite.addBatch({

"interpolateObject": {

topic: load("interpolate/object").expression("d3.interpolateObject"),

"interpolates defined properties": function(interpolate) {

assert.deepEqual(interpolate({a: 2, b: 12}, {a: 4, b: 24})(.5), {a: 3, b: 18});

},

"interpolates inherited properties": function(interpolate) {

function a(a) { this.a = a; }

a.prototype.b = 12;

assert.deepEqual(interpolate(new a(2), new a(4))(.5), {a: 3, b: 12});

},

"interpolates color properties as rgb": function(interpolate) {

assert.deepEqual(interpolate({background: "red"}, {background: "green"})(.5), {background: "#804000"});

assert.deepEqual(interpolate({fill: "red"}, {fill: "green"})(.5), {fill: "#804000"});

assert.deepEqual(interpolate({stroke: "red"}, {stroke: "green"})(.5), {stroke: "#804000"});

assert.deepEqual(interpolate({color: "red"}, {color: "green"})(.5), {color: "#804000"});

},

"interpolates nested objects and arrays": function(interpolate) {

assert.deepEqual(interpolate({foo: [2, 12]}, {foo: [4, 24]})(.5), {foo: [3, 18]});

assert.deepEqual(interpolate({foo: {bar: [2, 12]}}, {foo: {bar: [4, 24]}})(.5), {foo: {bar: [3, 18]}});

},

"merges non-shared properties": function(interpolate) {

assert.deepEqual(interpolate({foo: 2}, {foo: 4, bar: 12})(.5), {foo: 3, bar: 12});

assert.deepEqual(interpolate({foo: 2, bar: 12}, {foo: 4})(.5), {foo: 3, bar: 12});

}

}

});

suite.export(module);