var vows = require(“vows”),

load = require("../load"),
assert = require("assert");

var suite = vows.describe(“d3.geo.distance”);

suite.addBatch({

"distance": {
  topic: load("geo/distance").expression("d3.geo.distance"),
  "computes the great-arc distance": function(distance) {
    assert.equal(distance([0, 0], [0, 0]), 0);
    assert.inDelta(distance([118 + 24 / 60, 33 + 57 / 60], [ 73 + 47 / 60, 40 + 38 / 60]), 3973 / 6371, .5);
  },
  "small distance": function(distance) {
    assert.isTrue(distance([0, 0], [0, 1e-12]) > 0);
  }
}

});

suite.export(module);