1 require("../env");

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

     3 

     4 var assert = require("assert");

     5 

     6 module.exports = {

     7   topic: function() {

     8     return d3.select("body").append("div").transition();

     9   },

    10   "is approximately equal to now": function(transition) {

    11     var time = transition.time;

    12     assert.inDelta(time, Date.now(), 20);

    13   },

    14   "increases monotonically across transitions": function(transition) {

    15     var now = Date.now, then = Date.now();

    16     try {

    17       Date.now = function() { return ++then; };

    18       var t0 = d3.select("body").append("div").transition(),

    19           t1 = d3.select("body").append("div").transition();

    20       assert.isTrue(t1.time > t0.time);

    21     } finally {

    22       Date.now = now;

    23     }

    24   },

    25   "is inherited by subtransitions": function(transition) {

    26     var now = Date.now, then = Date.now();

    27     try {

    28       Date.now = function() { return ++then; };

    29       var t0 = d3.select("body").append("div").transition(),

    30           t1 = t0.transition();

    31       assert.equal(t1.time, t0.time);

    32     } finally {

    33       Date.now = now;

    34     }

    35   }

    36 };