diff -r efd9c589177a -r c0b4a8b5a012 toolkit/javascript/d3/test/core/range-test.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/test/core/range-test.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,93 @@
+require("../env");
+require("../../d3");
+
+var vows = require("vows"),
+    assert = require("assert");
+
+var suite = vows.describe("d3.range");
+
+suite.addBatch({
+  "range": {
+    topic: function() {
+      return d3.range;
+    },
+    "start is an inclusive lower bound": function(range) {
+      assert.equal(range(5)[0], 0);
+      assert.equal(range(1, 5)[0], 1);
+      assert.equal(range(5, 1, -1)[0], 5);
+    },
+    "stop is an exclusive upper bound": function(range) {
+      assert.equal(range(5)[4], 4);
+      assert.equal(range(1, 5)[3], 4);
+      assert.equal(range(5, 1, -1)[3], 2);
+    },
+    "with one argument, returns integers [0 … stop)": function(range) {
+      assert.deepEqual(range(0), []);
+      assert.deepEqual(range(1), [0]);
+      assert.deepEqual(range(5), [0, 1, 2, 3, 4]);
+    },
+    "with two arguments, returns integers [start … stop)": function(range) {
+      assert.deepEqual(range(0, 5), [0, 1, 2, 3, 4]);
+      assert.deepEqual(range(5, 9), [5, 6, 7, 8]);
+    },
+    "with three arguments, returns start + k * step": function(range) {
+      assert.deepEqual(range(0, 5, 1), [0, 1, 2, 3, 4]);
+      assert.deepEqual(range(5, 9, .5), [5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5]);
+      assert.deepEqual(range(5, 8.5, .5), [5, 5.5, 6, 6.5, 7, 7.5, 8]);
+      assert.deepEqual(range(2, 0, -.5), [2, 1.5, 1, .5]);
+    },
+    "returns an ascending range if step is positive": function(range) {
+      assert.deepEqual(range(0, 5, 1), [0, 1, 2, 3, 4]);
+    },
+    "returns a descending range if step is negative": function(range) {
+      assert.deepEqual(range(5, 0, -1), [5, 4, 3, 2, 1]);
+    },
+    "returns an empty range if start, stop or step are NaN": function(range) {
+      assert.isEmpty(range(0, NaN));
+      assert.isEmpty(range(1, NaN));
+      assert.isEmpty(range(-1, NaN));
+      assert.isEmpty(range(0, undefined));
+      assert.isEmpty(range(1, undefined));
+      assert.isEmpty(range(-1, undefined));
+      assert.isEmpty(range(NaN, 0));
+      assert.isEmpty(range(NaN, 1));
+      assert.isEmpty(range(NaN, -1));
+      assert.isEmpty(range(undefined, 0));
+      assert.isEmpty(range(undefined, 1));
+      assert.isEmpty(range(undefined, -1));
+      assert.isEmpty(range(NaN, NaN));
+      assert.isEmpty(range(undefined, undefined));
+      assert.isEmpty(range(NaN, NaN, NaN));
+      assert.isEmpty(range(undefined, undefined, undefined));
+      assert.isEmpty(range(0, 10, NaN));
+      assert.isEmpty(range(10, 0, NaN));
+      assert.isEmpty(range(0, 10, undefined));
+      assert.isEmpty(range(10, 0, undefined));
+    },
+    "returns an empty range if start equals stop": function(range) {
+      assert.isEmpty(range(10, 10));
+      assert.isEmpty(range(10, 10, 1));
+      assert.isEmpty(range(10, 10, -1));
+      assert.isEmpty(range(10, 10, -.5));
+      assert.isEmpty(range(10, 10, .5));
+      assert.isEmpty(range(0, 0));
+      assert.isEmpty(range(0, 0, 1));
+      assert.isEmpty(range(0, 0, -1));
+      assert.isEmpty(range(0, 0, -.5));
+      assert.isEmpty(range(0, 0, .5));
+    },
+    "returns an empty range if stop is less than start and step is positive": function(range) {
+      assert.isEmpty(range(20, 10));
+      assert.isEmpty(range(20, 10, 2));
+      assert.isEmpty(range(20, 10, 1));
+      assert.isEmpty(range(20, 10, .5));
+    },
+    "returns an empty range if stop is greater than start and step is negative": function(range) {
+      assert.isEmpty(range(10, 20, -2));
+      assert.isEmpty(range(10, 20, -1));
+      assert.isEmpty(range(10, 20, -.5));
+    }
+  }
+});
+
+suite.export(module);