diff -r efd9c589177a -r c0b4a8b5a012 toolkit/javascript/d3/test/core/selection-each-test.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/test/core/selection-each-test.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,83 @@
+require("../env");
+require("../../d3");
+
+var vows = require("vows"),
+    assert = require("assert");
+
+var suite = vows.describe("selection.each");
+
+suite.addBatch({
+  "select(body)": {
+    topic: function() {
+      return d3.select("body").html("");
+    },
+    "calls the function once per element": function(body) {
+      var count = 0;
+      body.each(function() { ++count; });
+      assert.equal(count, 1);
+    },
+    "passes the data and index to the function": function(body) {
+      var data = new Object(), dd, ii;
+      body.data([data]).each(function(d, i) { dd = d; ii = i; });
+      assert.isTrue(dd === data);
+      assert.isTrue(ii === 0);
+    },
+    "uses the node as the context": function(body) {
+      var node;
+      body.each(function() { node = this; });
+      assert.isTrue(node === document.body);
+    },
+    "returns the same selection": function(body) {
+      assert.isTrue(body.each(function() {}) === body);
+    },
+    "ignores null nodes": function() {
+      var count = 0, body = d3.select("body");
+      body[0][0] = null;
+      body.each(function() { ++count; });
+      assert.equal(count, 0);
+    },
+    "returns the current selection": function(body) {
+      assert.isTrue(body.each(function() {}) === body);
+    }
+  }
+});
+
+suite.addBatch({
+  "selectAll(div)": {
+    topic: function() {
+      return d3.select("body").html("").selectAll("div").data(d3.range(2)).enter().append("div");
+    },
+    "calls the function once per element": function(div) {
+      var count = 0;
+      div.each(function() { ++count; });
+      assert.equal(count, 2);
+    },
+    "passes the data and index to the function": function(div) {
+      var data = [new Object(), new Object()], dd = [], ii = [];
+      div.data(data).each(function(d, i) { dd.push(d); ii.push(i); });
+      assert.deepEqual(dd, data);
+      assert.deepEqual(ii, [0, 1]);
+    },
+    "uses the node as the context": function(div) {
+      var nodes = [];
+      div.each(function() { nodes.push(this); });
+      assert.equal(nodes.length, 2);
+      assert.isTrue(div[0][0] == nodes[0]);
+      assert.isTrue(div[0][1] == nodes[1]);
+    },
+    "returns the same selection": function(div) {
+      assert.isTrue(div.each(function() {}) === div);
+    },
+    "ignores null nodes": function(div) {
+      var count = 0, some = d3.selectAll("div");
+      some[0][0] = null;
+      some.each(function() { ++count; });
+      assert.equal(count, 1);
+    },
+    "returns the current selection": function(div) {
+      assert.isTrue(div.each(function() {}) === div);
+    }
+  }
+});
+
+suite.export(module);