diff -r efd9c589177a -r c0b4a8b5a012 toolkit/javascript/d3/test/core/selection-select-test.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/test/core/selection-select-test.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,125 @@
+require("../env");
+require("../../d3");
+
+var vows = require("vows"),
+    assert = require("assert");
+
+var suite = vows.describe("selection.select");
+
+suite.addBatch({
+  "select(body)": {
+    topic: function() {
+      var body = d3.select("body").html("");
+      body.append("div").attr("class", "first");
+      body.append("div").attr("class", "second");
+      return body;
+    },
+    "selects the first matching element": function(body) {
+      var div = body.select("div");
+      assert.isTrue(div[0][0] === document.body.firstChild);
+      assert.equal(div.length, 1);
+      assert.equal(div[0].length, 1);
+      assert.equal(div.attr("class"), "first");
+    },
+    "propagates parent node to the selected elements": function(body) {
+      var div = body.select("div");
+      assert.isNotNull(div[0].parentNode);
+      assert.isTrue(div[0].parentNode === document.documentElement);
+      assert.isTrue(div[0].parentNode === body[0].parentNode);
+    },
+    "propagates data to the selected elements": function(body) {
+      var data = new Object(), div = body.data([data]).select("div");
+      assert.strictEqual(div[0][0].__data__, data);
+    },
+    "does not propagate data if no data was specified": function(body) {
+      delete document.body.__data__;
+      var data = new Object(), div = body.select("div").data([data]);
+      div = body.select("div");
+      assert.strictEqual(div[0][0].__data__, data);
+      assert.isUndefined(document.body.__data__);
+    },
+    "returns null if no match is found": function(body) {
+      var span = body.select("span");
+      assert.equal(span[0][0], null);
+      assert.equal(span.length, 1);
+      assert.equal(span[0].length, 1);
+    },
+    "can select via function": function(body) {
+      body.append("foo");
+      var d = {}, dd = [], ii = [], tt = [],
+          s = body.data([d]).select(function(d, i) { dd.push(d); ii.push(i); tt.push(this); return this.firstChild; });
+      assert.deepEqual(dd, [d], "expected data, got {actual}");
+      assert.deepEqual(ii, [0], "expected index, got {actual}");
+      assert.domEqual(tt[0], document.body, "expected this, got {actual}");
+      assert.domEqual(s[0][0], document.body.firstChild);
+      delete document.body.__data__;
+    }
+  }
+});
+
+suite.addBatch({
+  "selectAll(div)": {
+    topic: function() {
+      var div = d3.select("body").html("").selectAll("div").data(d3.range(2)).enter().append("div");
+      div.append("span").attr("class", "first");
+      div.append("span").attr("class", "second");
+      return div;
+    },
+    "selects the first matching element": function(div) {
+      var span = div.select("span");
+      assert.isTrue(span[0][0].parentNode === div[0][0]);
+      assert.isTrue(span[0][1].parentNode === div[0][1]);
+      assert.equal(span.length, 1);
+      assert.equal(span[0].length, 2);
+      assert.equal(span.attr("class"), "first");
+    },
+    "propagates parent node to the selected elements": function(div) {
+      var span = div.select("span");
+      assert.isNotNull(span[0].parentNode);
+      assert.isTrue(span[0].parentNode === document.body);
+      assert.isTrue(span[0].parentNode === div[0].parentNode);
+    },
+    "propagates data to the selected elements": function(div) {
+      var data = new Object(), span = div.data([data]).select("span");
+      assert.strictEqual(span[0][0].__data__, data);
+    },
+    "does not propagate data if no data was specified": function(div) {
+      delete div[0][0].__data__;
+      delete div[0][1].__data__;
+      var a = new Object(), b = new Object(), span = div.select("span").data([a, b]);
+      span = div.select("span");
+      assert.strictEqual(span[0][0].__data__, a);
+      assert.strictEqual(span[0][1].__data__, b);
+      assert.isUndefined(div[0][0].__data__);
+      assert.isUndefined(div[0][1].__data__);
+    },
+    "returns null if no match is found": function(div) {
+      var div = div.select("div");
+      assert.equal(div[0][0], null);
+      assert.equal(div[0][1], null);
+      assert.equal(div.length, 1);
+      assert.equal(div[0].length, 2);
+    },
+    "ignores null nodes": function(div) {
+      var some = d3.selectAll("div");
+      some[0][1] = null;
+      var span = some.select("span");
+      assert.equal(span.length, 1);
+      assert.equal(span[0].length, 2);
+      assert.isTrue(span[0][0].parentNode === div[0][0]);
+      assert.isNull(span[0][1]);
+    },
+    "can select via function": function(div) {
+      var dd = [], ii = [], tt = [],
+          s = div.data(["a", "b"]).select(function(d, i) { dd.push(d); ii.push(i); tt.push(this); return this.firstChild; });
+      assert.deepEqual(dd, ["a", "b"], "expected data, got {actual}");
+      assert.deepEqual(ii, [0, 1], "expected index, got {actual}");
+      assert.domEqual(tt[0], div[0][0], "expected this, got {actual}");
+      assert.domEqual(tt[1], div[0][1], "expected this, got {actual}");
+      assert.domEqual(s[0][0], div[0][0].firstChild);
+      assert.domEqual(s[0][1], div[0][1].firstChild);
+    }
+  }
+});
+
+suite.export(module);