1 require("../env");

     2 require("../../d3");

     3 

     4 var assert = require("assert");

     5 

     6 module.exports = {

     7   topic: function() {

     8     var cb = this.callback;

     9 

    10     var s = d3.select("body").append("div")

    11         .style("background-color", "white")

    12         .style("color", "red")

    13         .style("display", "none")

    14         .style("font-size", "20px");

    15 

    16     var t = s.transition()

    17         .style("display", null)

    18         .style("font-size", function() { return null; })

    19         .style("display", null)

    20         .style("background-color", "green")

    21         .style("background-color", "red")

    22         .style("color", function() { return "green"; }, "important")

    23         .each("end", function() { cb(null, {selection: s, transition: t}); });

    24   },

    25   "defines the corresponding style tween": function(result) {

    26     assert.typeOf(result.transition.tween("style.background-color"), "function");

    27     assert.typeOf(result.transition.tween("style.color"), "function");

    28   },

    29   "the last style operator takes precedence": function(result) {

    30     assert.equal(result.selection.style("background-color"), "#ff0000");

    31   },

    32   "sets a property as a string": function(result) {

    33     assert.equal(result.selection.style("background-color"), "#ff0000");

    34   },

    35   "sets a property as a function": function(result) {

    36     assert.equal(result.selection.style("color"), "#008000");

    37   },

    38   "observes the specified priority": function(result) {

    39     var style = result.selection.node().style;

    40     assert.equal(style.getPropertyPriority("background-color"), "");

    41     assert.equal(style.getPropertyPriority("color"), "important");

    42   },

    43   "removes a property using a constant null": function(result) {

    44     assert.equal(result.selection.style("display"), "");

    45   },

    46   "removes a property using a function null": function(result) {

    47     assert.equal(result.selection.style("font-size"), "");

    48   }

    49 };