diff -r efd9c589177a -r c0b4a8b5a012 toolkit/javascript/d3/test/core/quantile-test.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/test/core/quantile-test.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,50 @@
+require("../env");
+require("../../d3");
+
+var vows = require("vows"),
+    assert = require("assert");
+
+var suite = vows.describe("d3.quantile");
+
+suite.addBatch({
+  "quantile": {
+    topic: function() {
+      return d3.quantile;
+    },
+    "requires sorted numeric input": function(quantile) {
+      assert.equal(quantile([1, 2, 3, 4], 0), 1);
+      assert.equal(quantile([1, 2, 3, 4], 1), 4);
+      assert.equal(quantile([4, 3, 2, 1], 0), 4);
+      assert.equal(quantile([4, 3, 2, 1], 1), 1);
+    },
+    "uses the R-7 algorithm": function(quantile) {
+      var data = [3, 6, 7, 8, 8, 10, 13, 15, 16, 20];
+      assert.equal(quantile(data, 0), 3);
+      assert.equal(quantile(data, .25), 7.25);
+      assert.equal(quantile(data, .5), 9);
+      assert.equal(quantile(data, .75), 14.5);
+      assert.equal(quantile(data, 1), 20);
+      var data = [3, 6, 7, 8, 8, 9, 10, 13, 15, 16, 20];
+      assert.equal(quantile(data, 0), 3);
+      assert.equal(quantile(data, .25), 7.5);
+      assert.equal(quantile(data, .5), 9);
+      assert.equal(quantile(data, .75), 14);
+      assert.equal(quantile(data, 1), 20);
+    },
+    "returns an exact value for integer p-values": function(quantile) {
+      var a = {}, b = {}, c = {}, d = {}, data = [a, b, c, d];
+      assert.equal(quantile(data, 1/3), b);
+      assert.equal(quantile(data, 2/3), c);
+    },
+    "returns the first value for p = 0": function(quantile) {
+      var a = {}, b = {}, c = {}, d = {}, data = [a, b, c, d];
+      assert.equal(quantile(data, 0), a);
+    },
+    "returns the last value for p = 1": function(quantile) {
+      var a = {}, b = {}, c = {}, d = {}, data = [a, b, c, d];
+      assert.equal(quantile(data, 1), d);
+    }
+  }
+});
+
+suite.export(module);