diff -r efd9c589177a -r c0b4a8b5a012 toolkit/javascript/d3/test/core/selection-empty-test.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/test/core/selection-empty-test.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,51 @@
+require("../env");
+require("../../d3");
+
+var vows = require("vows"),
+    assert = require("assert");
+
+var suite = vows.describe("selection.empty");
+
+suite.addBatch({
+  "select(body)": {
+    topic: function() {
+      return d3.select("body").html("");
+    },
+    "returns true for empty selections": function(body) {
+      assert.isTrue(body.select("foo").empty());
+    },
+    "returns false for non-empty selections": function(body) {
+      assert.isFalse(body.empty());
+    },
+    "ignores null nodes": function(body) {
+      var some = d3.select("body");
+      some[0][0] = null;
+      assert.isTrue(some.empty());
+    }
+  }
+});
+
+suite.addBatch({
+  "selectAll(div)": {
+    topic: function() {
+      var body = d3.select("body").html("");
+      body.append("div").append("span");
+      body.append("div");
+      return body.selectAll("div");
+    },
+    "returns true for empty selections": function(div) {
+      assert.isTrue(div.select("foo").empty());
+    },
+    "returns false for non-empty selections": function(div) {
+      assert.isFalse(div.empty());
+      assert.isFalse(div.select("span").empty());
+    },
+    "ignores null nodes": function(div) {
+      var some = d3.selectAll("div");
+      some[0][0] = null;
+      assert.isTrue(some.select("span").empty());
+    }
+  }
+});
+
+suite.export(module);