var vows = require(“vows”),

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

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

suite.addBatch({

"greatArc": {
  topic: load("geo/greatArc").expression("d3.geo.greatArc"),
  "distance": function(arc) {
    var a = arc();
    assert.equal(a.distance({source: [0, 0], target: [0, 0]}), 0);
    assert.inDelta(a.distance({
      source: [118 + 24 / 60, 33 + 57 / 60],
      target: [ 73 + 47 / 60, 40 + 38 / 60]
    }), 3973 / 6371, .5);
  },
  "source and target can be set as constants": function(arc) {
    var a = arc().source([5, 52]).target([-120, 37]);
    assert.inDelta(a().coordinates, [
      [   5,        52      ],
      [-120,        37      ]
    ], .5);
  },
  "geodesic": function(arc) {
    var a = arc();
    assert.inDelta(a({source: [5, 52], target: [-120, 37]}).coordinates, [
      [   5,        52      ],
      [-120,        37      ]
    ], .5);
  }
}

});

suite.export(module);