var assert = require(“../assert”);

module.exports = {

topic: function(d3) {
  return d3.select("body").html("").selectAll()
      .data(["foo", "bar"])
    .enter().append("div")
      .attr("class", String);
},
"defaults to 250 milliseconds": function(selection) {
  var t = selection.transition();
  assert.strictEqual(t[0][0].__transition__[t.id].duration, 250);
  assert.strictEqual(t[0][1].__transition__[t.id].duration, 250);
},
"can specify duration as a number": function(selection) {
  var t = selection.transition().duration(150);
  assert.strictEqual(t[0][0].__transition__[t.id].duration, 150);
  assert.strictEqual(t[0][1].__transition__[t.id].duration, 150);
  t.duration(50);
  assert.strictEqual(t[0][0].__transition__[t.id].duration, 50);
  assert.strictEqual(t[0][1].__transition__[t.id].duration, 50);
},
"NaN, zero, or negative durations are treated as 1ms": function(selection) {
  var t = selection.transition().duration(NaN);
  assert.strictEqual(t[0][0].__transition__[t.id].duration, 1);
  assert.strictEqual(t[0][1].__transition__[t.id].duration, 1);
  t.duration(0);
  assert.strictEqual(t[0][0].__transition__[t.id].duration, 1);
  assert.strictEqual(t[0][1].__transition__[t.id].duration, 1);
  t.duration(-10);
  assert.strictEqual(t[0][0].__transition__[t.id].duration, 1);
  assert.strictEqual(t[0][1].__transition__[t.id].duration, 1);
  t.duration(-Infinity);
  assert.strictEqual(t[0][0].__transition__[t.id].duration, 1);
  assert.strictEqual(t[0][1].__transition__[t.id].duration, 1);
},
"floating-point durations are floored to integers": function(selection) {
  var t = selection.transition().duration(14.6);
  assert.strictEqual(t[0][0].__transition__[t.id].duration, 14);
  assert.strictEqual(t[0][1].__transition__[t.id].duration, 14);
  var t = selection.transition().duration("16.99");
  assert.strictEqual(t[0][0].__transition__[t.id].duration, 16);
  assert.strictEqual(t[0][1].__transition__[t.id].duration, 16);
},
"can specify duration as a function": function(selection) {
  var dd = [], ii = [], tt = [], t = selection.transition().duration(f);
  function f(d, i) { dd.push(d); ii.push(i); tt.push(this); return i * 20 + 10; }
  assert.strictEqual(t[0][0].__transition__[t.id].duration, 10);
  assert.strictEqual(t[0][1].__transition__[t.id].duration, 30);
  assert.deepEqual(dd, ["foo", "bar"], "expected data, got {actual}");
  assert.deepEqual(ii, [0, 1], "expected index, got {actual}");
  assert.domEqual(tt[0], t[0][0], "expected this, got {actual}");
  assert.domEqual(tt[1], t[0][1], "expected this, got {actual}");
},
"coerces duration to a number": function(selection) {
  var t = selection.transition().duration("150");
  assert.strictEqual(t[0][0].__transition__[t.id].duration, 150);
  assert.strictEqual(t[0][1].__transition__[t.id].duration, 150);
}

};