1 require("../env");

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

     3 

     4 var assert = require("assert");

     5 

     6 module.exports = {

     7   topic: function() {

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

     9         .data(["one", "two", "three", "four"])

    10       .enter().append("div")

    11         .attr("class", String);

    12 

    13     s.filter(function(d, i) { return i > 0; }).append("span");

    14     s[0][3] = null;

    15 

    16     return s.transition()

    17         .delay(function(d, i) { return i * 13; })

    18         .duration(function(d, i) { return i * 21; });

    19   },

    20 

    21   "selects the first matching element": function(transition) {

    22     var t = transition.select("span");

    23     assert.domEqual(t[0][1].node.parentNode, transition[0][1].node);

    24     assert.domEqual(t[0][2].node.parentNode, transition[0][2].node);

    25   },

    26   "ignores null elements": function(transition) {

    27     var t = transition.select("span");

    28     assert.isNull(t[0][3]);

    29   },

    30   "propagates data to the selected elements": function(transition) {

    31     var t = transition.select("span");

    32     assert.equal(t[0][1].node.__data__, "two");

    33     assert.equal(t[0][2].node.__data__, "three");

    34   },

    35   "propagates delay to the selected elements": function(transition) {

    36     var t = transition.select("span");

    37     assert.equal(t[0][1].delay, 13);

    38     assert.equal(t[0][2].delay, 26);

    39   },

    40   "propagates duration to the selected elements": function(transition) {

    41     var t = transition.select("span");

    42     assert.equal(t[0][1].duration, 21);

    43     assert.equal(t[0][2].duration, 42);

    44   },

    45   "does not propagate data if no data was specified": function(transition) {

    46     delete transition[0][1].node.__data__;

    47     delete transition[0][1].node.firstChild.__data__;

    48     var t = transition.select("span");

    49     assert.isUndefined(t[0][1].node.__data__);

    50     assert.equal(t[0][2].node.__data__, "three");

    51   },

    52   "returns null if no match is found": function(transition) {

    53     var t = transition.select("span");

    54     assert.isNull(t[0][0]);

    55   },

    56   "inherits transition id": function(transition) {

    57     var id = transition.id,

    58         t0 = transition.select("span"),

    59         t1 = transition.select("span");

    60     assert.equal(t0.id, id);

    61     assert.equal(t1.id, id);

    62   }

    63 };