diff -r efd9c589177a -r c0b4a8b5a012 toolkit/javascript/d3/test/core/transition-test-select.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/test/core/transition-test-select.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,63 @@
+require("../env");
+require("../../d3");
+
+var assert = require("assert");
+
+module.exports = {
+  topic: function() {
+    var s = d3.select("body").append("div").selectAll("div")
+        .data(["one", "two", "three", "four"])
+      .enter().append("div")
+        .attr("class", String);
+
+    s.filter(function(d, i) { return i > 0; }).append("span");
+    s[0][3] = null;
+
+    return s.transition()
+        .delay(function(d, i) { return i * 13; })
+        .duration(function(d, i) { return i * 21; });
+  },
+
+  "selects the first matching element": function(transition) {
+    var t = transition.select("span");
+    assert.domEqual(t[0][1].node.parentNode, transition[0][1].node);
+    assert.domEqual(t[0][2].node.parentNode, transition[0][2].node);
+  },
+  "ignores null elements": function(transition) {
+    var t = transition.select("span");
+    assert.isNull(t[0][3]);
+  },
+  "propagates data to the selected elements": function(transition) {
+    var t = transition.select("span");
+    assert.equal(t[0][1].node.__data__, "two");
+    assert.equal(t[0][2].node.__data__, "three");
+  },
+  "propagates delay to the selected elements": function(transition) {
+    var t = transition.select("span");
+    assert.equal(t[0][1].delay, 13);
+    assert.equal(t[0][2].delay, 26);
+  },
+  "propagates duration to the selected elements": function(transition) {
+    var t = transition.select("span");
+    assert.equal(t[0][1].duration, 21);
+    assert.equal(t[0][2].duration, 42);
+  },
+  "does not propagate data if no data was specified": function(transition) {
+    delete transition[0][1].node.__data__;
+    delete transition[0][1].node.firstChild.__data__;
+    var t = transition.select("span");
+    assert.isUndefined(t[0][1].node.__data__);
+    assert.equal(t[0][2].node.__data__, "three");
+  },
+  "returns null if no match is found": function(transition) {
+    var t = transition.select("span");
+    assert.isNull(t[0][0]);
+  },
+  "inherits transition id": function(transition) {
+    var id = transition.id,
+        t0 = transition.select("span"),
+        t1 = transition.select("span");
+    assert.equal(t0.id, id);
+    assert.equal(t1.id, id);
+  }
+};