diff -r efd9c589177a -r c0b4a8b5a012 toolkit/javascript/d3/test/core/hsl-test.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/test/core/hsl-test.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,82 @@
+require("../env");
+require("../../d3");
+
+var vows = require("vows"),
+    assert = require("assert");
+
+var suite = vows.describe("d3.hsl");
+
+suite.addBatch({
+  "hsl": {
+    topic: function() {
+      return d3.hsl;
+    },
+    "does not clamp channel values": function(hsl) {
+      assert.hslEqual(hsl(-100, -1, -2), -100, -1, -2);
+      assert.hslEqual(hsl(400, 2, 3), 400, 2, 3);
+    },
+    "converts string channel values to numbers": function(hsl) {
+      assert.hslEqual(hsl("180", ".5", ".6"), 180, .5, .6);
+    },
+    "converts null channel values to zero": function(hsl) {
+      assert.hslEqual(hsl(null, null, null), 0, 0, 0);
+    },
+    "exposes h, s and l properties": function(hsl) {
+      var color = hsl("hsl(180, 50%, 60%)");
+      assert.equal(color.h, 180);
+      assert.equal(color.s, .5);
+      assert.equal(color.l, .6);
+    },
+    "changing h, s or l affects the string format": function(hsl) {
+      var color = hsl("hsl(180, 50%, 60%)");
+      color.h++;
+      color.s += .1;
+      color.l += .1;
+      assert.equal(color + "", "#85dfe0");
+    },
+    "parses hexadecimal shorthand format (e.g., \"#abc\")": function(hsl) {
+      assert.hslEqual(hsl("#abc"), 210, .25, .733333);
+    },
+    "parses hexadecimal format (e.g., \"#abcdef\")": function(hsl) {
+      assert.hslEqual(hsl("#abcdef"), 210, .68, .803922);
+    },
+    "parses HSL format (e.g., \"hsl(210, 64%, 13%)\")": function(hsl) {
+      assert.hslEqual(hsl("hsl(210, 64.7058%, 13.33333%)"), 210, .647058, .133333);
+    },
+    "parses color names (e.g., \"moccasin\")": function(hsl) {
+      assert.hslEqual(hsl("moccasin"), 38.108108, 1, .854902);
+      assert.hslEqual(hsl("aliceblue"), 208, 1, .970588);
+      assert.hslEqual(hsl("yellow"), 60, 1, .5);
+    },
+    "parses and converts RGB format (e.g., \"rgb(102, 102, 0)\")": function(hsl) {
+      assert.hslEqual(hsl("rgb(102, 102, 0)"), 60, 1, .2);
+    },
+    "can convert from RGB": function(hsl) {
+      assert.hslEqual(hsl(d3.rgb(12, 34, 56)), 210, .647058, .133333);
+    },
+    "can convert from HSL": function(hsl) {
+      assert.hslEqual(hsl(d3.hsl(20, .8, .3)), 20, .8, .3);
+    },
+    "can convert to RGB": function(hsl) {
+      assert.rgbEqual(hsl("steelblue").rgb(), 70, 130, 180);
+    },
+    "can derive a brighter color": function(hsl) {
+      assert.hslEqual(hsl("steelblue").brighter(), 207.272727, .44, .7002801);
+      assert.hslEqual(hsl("steelblue").brighter(.5), 207.272727, .44, .5858964);
+      assert.hslEqual(hsl("steelblue").brighter(1), 207.272727, .44, .7002801);
+      assert.hslEqual(hsl("steelblue").brighter(2), 207.272727, .44, 1.0004002);
+    },
+    "can derive a darker color": function(hsl) {
+      assert.hslEqual(hsl("lightsteelblue").darker(), 213.913043, .4107143, .5462745);
+      assert.hslEqual(hsl("lightsteelblue").darker(.5), 213.913043, .4107143, .6529229);
+      assert.hslEqual(hsl("lightsteelblue").darker(1), 213.913043, .4107143, .5462745);
+      assert.hslEqual(hsl("lightsteelblue").darker(2), 213.913043, .4107143, .38239216);
+    },
+    "string coercion returns RGB format": function(hsl) {
+      assert.strictEqual(hsl("hsl(60, 100%, 20%)") + "", "#666600");
+      assert.strictEqual(hsl(d3.hsl(60, 1, .2)) + "", "#666600");
+    }
+  }
+});
+
+suite.export(module);