diff --git a/test/core/selection-insert-test.js b/test/core/selection-insert-test.js
new file mode 100644
index 00000000..da258ff9
--- /dev/null
+++ b/test/core/selection-insert-test.js
@@ -0,0 +1,122 @@
+require("../env");
+require("../../d3");
+
+var vows = require("vows"),
+    assert = require("assert");
+
+var suite = vows.describe("selection.insert");
+
+suite.addBatch({
+  "select(body)": {
+    topic: function() {
+      return d3.select("body").html("");
+    },
+    "inserts before the specified selector": function(body) {
+      var span = body.html("").append("span");
+      var div = body.insert("div", "span");
+      assert.equal(div[0][0].tagName, "DIV");
+      assert.isNull(div[0][0].namespaceURI);
+      assert.domEqual(div[0][0], document.body.firstChild);
+      assert.domEqual(div[0][0].nextSibling, span[0][0]);
+    },
+    "appends an HTML element": function(body) {
+      var div = body.insert("div");
+      assert.equal(div[0][0].tagName, "DIV");
+      assert.isNull(div[0][0].namespaceURI);
+      assert.domEqual(div[0][0], document.body.lastChild);
+    },
+    "appends an SVG element": function(body) {
+      var svg = body.insert("svg:svg");
+      assert.equal(svg[0][0].tagName, "SVG");
+      assert.equal(svg[0][0].namespaceURI, "http://www.w3.org/2000/svg");
+      assert.domEqual(svg[0][0].parentNode, document.body);
+      assert.domEqual(svg[0][0], document.body.lastChild);
+    },
+    "propagates data to new element": function(body) {
+      var data = new Object(), div = body.data([data]).insert("div");
+      assert.strictEqual(div[0][0].__data__, data);
+    }
+  }
+});
+
+suite.addBatch({
+  "selectAll(div)": {
+    topic: function() {
+      return d3.select("body").html("").selectAll("div").data(d3.range(2)).enter().insert("div");
+    },
+    "appends an HTML element": function(div) {
+      var span = div.insert("span");
+      assert.equal(span[0].length, 2);
+      assert.equal(span[0][0].tagName, "SPAN");
+      assert.equal(span[0][1].tagName, "SPAN");
+      assert.isNull(span[0][0].namespaceURI);
+      assert.isNull(span[0][1].namespaceURI);
+      assert.domEqual(span[0][0].parentNode, div[0][0]);
+      assert.domEqual(span[0][1].parentNode, div[0][1]);
+      assert.domEqual(div[0][0].lastChild, span[0][0]);
+      assert.domEqual(div[0][1].lastChild, span[0][1]);
+    },
+    "appends an SVG element": function(div) {
+      var svg = div.insert("svg:svg");
+      assert.equal(svg[0].length, 2);
+      assert.equal(svg[0][0].tagName, "SVG");
+      assert.equal(svg[0][1].tagName, "SVG");
+      assert.equal(svg[0][0].namespaceURI, "http://www.w3.org/2000/svg");
+      assert.equal(svg[0][1].namespaceURI, "http://www.w3.org/2000/svg");
+      assert.domEqual(svg[0][0].parentNode, div[0][0]);
+      assert.domEqual(svg[0][1].parentNode, div[0][1]);
+      assert.domEqual(div[0][0].lastChild, svg[0][0]);
+      assert.domEqual(div[0][1].lastChild, svg[0][1]);
+    },
+    "ignores null nodes": function(div) {
+      div.html("");
+      var some = d3.selectAll("div");
+      some[0][1] = null;
+      var span = some.insert("span");
+      assert.equal(span[0].length, 2);
+      assert.equal(span[0][0].tagName, "SPAN");
+      assert.domNull(span[0][1]);
+      assert.domEqual(span[0][0].parentNode, div[0][0]);
+      assert.domEqual(div[0][0].lastChild, span[0][0]);
+      assert.domNull(div[0][1].lastChild);
+    },
+    "propagates data to new elements": function(div) {
+      var a = new Object(), b = new Object(), span = div.data([a, b]).insert("span");
+      assert.strictEqual(span[0][0].__data__, a);
+      assert.strictEqual(span[0][1].__data__, b);
+    }
+  }
+});
+
+suite.addBatch({
+  "selectAll(div).data(…).enter()": {
+    topic: function() {
+      return d3.select("body");
+    },
+    "inserts before the specified selector": function(body) {
+      var span = body.html("").append("span");
+      var div = body.selectAll("div").data(d3.range(2)).enter().insert("div", "span");
+      assert.equal(div.length, 1);
+      assert.equal(div[0].length, 2);
+      assert.domEqual(div[0][0], document.body.firstChild);
+      assert.domEqual(div[0][1].previousSibling, div[0][0]);
+      assert.domEqual(div[0][1].nextSibling, span[0][0]);
+    },
+    "propagates data to new elements": function(body) {
+      var a = new Object(), b = new Object(), div = body.html("").selectAll("div").data([a, b]).enter().insert("div");
+      assert.strictEqual(div[0][0].__data__, a);
+      assert.strictEqual(div[0][1].__data__, b);
+    },
+    "ignores null nodes": function(body) {
+      body.html("").insert("div");
+      var div = body.selectAll("div").data(d3.range(3)).enter().insert("div");
+      assert.equal(div.length, 1);
+      assert.equal(div[0].length, 3);
+      assert.domNull(div[0][0]);
+      assert.domEqual(div[0][1].parentNode, document.body);
+      assert.domEqual(div[0][2].parentNode, document.body);
+    }
+  }
+});
+
+suite.export(module);