var assert = require(“../assert”),
_ = require("../../");
module.exports = {
topic: function(d3) { var callback = this.callback, dd = [], ii = [], tt = [], vv = []; var s = d3.select("body").html("").append("div").selectAll("div") .data(["red", "green"]) .enter().append("div") .attr("color", function(d, i) { return i ? "#008000" : "#ff0000"; }); var t = s.transition() .attrTween("color", tween); function tween(d, i, v) { dd.push(d); ii.push(i); vv.push(v); if (tt.push(this) >= 2) callback(null, { selection: s, transition: t, data: dd, index: ii, value: vv, context: tt }); return i && _.interpolateHsl(v, "blue"); } }, "defines the corresponding attr tween": function(result) { assert.typeOf(result.transition.tween("attr.color"), "function"); }, "invokes the tween function": function(result) { assert.deepEqual(result.data, ["red", "green"], "expected data, got {actual}"); assert.deepEqual(result.index, [0, 1], "expected data, got {actual}"); assert.deepEqual(result.value, ["#ff0000", "#008000"], "expected value, got {actual}"); assert.domEqual(result.context[0], result.selection[0][0], "expected this, got {actual}"); assert.domEqual(result.context[1], result.selection[0][1], "expected this, got {actual}"); }, "end": { topic: function(result) { var callback = this.callback; result.transition.each("end", function(d, i) { if (i >= 1) callback(null, result); }); }, "uses the returned interpolator": function(result) { assert.equal(result.selection[0][1].getAttribute("color"), "#0000ff"); }, "does nothing if the interpolator is falsey": function(result) { assert.equal(result.selection[0][0].getAttribute("color"), "#ff0000"); } }
};