diff -r efd9c589177a -r c0b4a8b5a012 toolkit/javascript/d3/test/geo/greatArc-test.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/test/geo/greatArc-test.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,41 @@
+require("../env");
+require("../../d3");
+require("../../d3.geo");
+
+var vows = require("vows"),
+    assert = require("assert");
+
+var suite = vows.describe("d3.geo.greatArc");
+
+suite.addBatch({
+  "greatArc": {
+    topic: function() {
+      return d3.geo.greatArc();
+    },
+    "distance": function(arc) {
+      assert.equal(arc.distance({source: [0, 0], target: [0, 0]}), 0);
+      assert.inDelta(arc.distance({
+        source: [118 + 24 / 60, 33 + 57 / 60],
+        target: [ 73 + 47 / 60, 40 + 38 / 60]
+      }), 3973 / 6371, .5);
+    },
+    "geodesic": function(arc) {
+      assert.inDelta(arc.precision(7.2)({source: [5, 52], target: [-120, 37]}).coordinates, [
+        [   5,        52      ],
+        [  -3.805036, 57.05083],
+        [ -15.122869, 61.30118],
+        [ -29.396213, 64.34584],
+        [ -46.132729, 65.72409],
+        [ -63.394401, 65.15597],
+        [ -78.854311, 62.76337],
+        [ -91.401599, 58.96701],
+        [-101.190927, 54.21333],
+        [-108.843633, 48.83586],
+        [-114.961152, 43.05231],
+        [-120,        37      ]
+      ], .5);
+    }
+  }
+});
+
+suite.export(module);