diff -r efd9c589177a -r c0b4a8b5a012 toolkit/javascript/d3/test/core/permute-test.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/test/core/permute-test.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,53 @@
+require("../env");
+require("../../d3");
+
+var vows = require("vows"),
+    assert = require("assert");
+
+var suite = vows.describe("d3.permute");
+
+suite.addBatch({
+  "permute": {
+    topic: function() {
+      return d3.permute;
+    },
+    "permutes according to the specified index": function(permute) {
+      assert.deepEqual(permute([3, 4, 5], [2, 1, 0]), [5, 4, 3]);
+      assert.deepEqual(permute([3, 4, 5], [2, 0, 1]), [5, 3, 4]);
+      assert.deepEqual(permute([3, 4, 5], [0, 1, 2]), [3, 4, 5]);
+    },
+    "does not modify the input array": function(permute) {
+      var input = [3, 4, 5];
+      permute(input, [2, 1, 0]);
+      assert.deepEqual(input, [3, 4, 5]);
+    },
+    "can duplicate input values": function(permute) {
+      assert.deepEqual(permute([3, 4, 5], [0, 1, 0]), [3, 4, 3]);
+      assert.deepEqual(permute([3, 4, 5], [2, 2, 2]), [5, 5, 5]);
+      assert.deepEqual(permute([3, 4, 5], [0, 1, 1]), [3, 4, 4]);
+    },
+    "can return more elements": function(permute) {
+      assert.deepEqual(permute([3, 4, 5], [0, 0, 1, 2]), [3, 3, 4, 5]);
+      assert.deepEqual(permute([3, 4, 5], [0, 1, 1, 1]), [3, 4, 4, 4]);
+    },
+    "can return fewer elements": function(permute) {
+      assert.deepEqual(permute([3, 4, 5], [0]), [3]);
+      assert.deepEqual(permute([3, 4, 5], [1, 2]), [4, 5]);
+      assert.deepEqual(permute([3, 4, 5], []), []);
+    },
+    "can return undefined elements": function(permute) {
+      var v1 = permute([3, 4, 5], [10]);
+      assert.equal(v1.length, 1);
+      assert.isUndefined(v1[0]);
+      var v2 = permute([3, 4, 5], [-1]);
+      assert.equal(v2.length, 1);
+      assert.isUndefined(v2[0]);
+      var v3 = permute([3, 4, 5], [0, -1]);
+      assert.equal(v3.length, 2);
+      assert.equal(v3[0], 3);
+      assert.isUndefined(v3[1]);
+    }
+  }
+});
+
+suite.export(module);