diff -r efd9c589177a -r c0b4a8b5a012 toolkit/javascript/d3/test/layout/partition-test.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/test/layout/partition-test.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,50 @@
+require("../env");
+require("../../d3");
+require("../../d3.layout");
+
+var vows = require("vows"),
+    assert = require("assert");
+
+var suite = vows.describe("d3.layout.partition");
+
+suite.addBatch({
+  "partition": {
+    topic: function() {
+      return d3.layout.partition;
+    },
+    "ignores zero values": function(partition) {
+      var p = partition().size([3, 3]);
+      assert.deepEqual(p.nodes({children: [{value: 1}, {value: 0}, {value: 2}, {children: [{value: 0}, {value: 0}]}]}).map(metadata), [
+        {x: 0, y: 0, dx: 3, dy: 1},
+        {x: 2, y: 1, dx: 1, dy: 1},
+        {x: 3, y: 1, dx: 0, dy: 1},
+        {x: 0, y: 1, dx: 2, dy: 1},
+        {x: 3, y: 1, dx: 0, dy: 1},
+        {x: 3, y: 2, dx: 0, dy: 1},
+        {x: 3, y: 2, dx: 0, dy: 1}
+      ]);
+    },
+    "can handle an empty children array": function(partition) {
+      var p = partition();
+      assert.deepEqual(p.nodes({children: []}).map(metadata), [
+        {x: 0, y: 0, dx: 1, dy: 1}
+      ]);
+      assert.deepEqual(p.nodes({children: [{children: []}, {value: 1}]}).map(metadata), [
+        {x: 0, y: 0,   dx: 1, dy: 0.5},
+        {x: 1, y: 0.5, dx: 0, dy: 0.5},
+        {x: 0, y: 0.5, dx: 1, dy: 0.5}
+      ]);
+    }
+  }
+});
+
+function metadata(node) {
+  var metadata = {};
+  if ("x" in node) metadata.x = node.x;
+  if ("y" in node) metadata.y = node.y;
+  if ("dx" in node) metadata.dx = node.dx;
+  if ("dy" in node) metadata.dy = node.dy;
+  return metadata;
+}
+
+suite.export(module);