var vows = require("vows"),
    _ = require("../../"),
    load = require("../load"),
    assert = require("../assert"),
    time = require("./time"),
    local = time.local,
    utc = time.utc;

var suite = vows.describe("d3.time.scale");

suite.addBatch({
  "scale": {
    topic: load("time/scale").expression("d3.time.scale").document(),

    "nice": {
      "rounds using the specified time interval": function(scale) {
        var x = scale().domain([local(2009, 0, 1, 0, 12), local(2009, 0, 1, 23, 48)]);
        assert.deepEqual(x.nice(_.time.day).domain(), [local(2009, 0, 1), local(2009, 0, 2)]);
        assert.deepEqual(x.nice(_.time.week).domain(), [local(2008, 11, 28), local(2009, 0, 4)]);
        assert.deepEqual(x.nice(_.time.month).domain(), [local(2008, 11, 1), local(2009, 1, 1)]);
        assert.deepEqual(x.nice(_.time.year).domain(), [local(2008, 0, 1), local(2010, 0, 1)]);
      },
      "rounds using the specified time interval and skip": function(scale) {
        var x = scale().domain([local(2009, 0, 1, 0, 12), local(2009, 0, 1, 23, 48)]);
        assert.deepEqual(x.nice(_.time.day, 3).domain(), [local(2009, 0, 1), local(2009, 0, 4)]);
        assert.deepEqual(x.nice(_.time.week, 2).domain(), [local(2008, 11, 21), local(2009, 0, 4)]);
        assert.deepEqual(x.nice(_.time.month, 3).domain(), [local(2008, 9, 1), local(2009, 3, 1)]);
        assert.deepEqual(x.nice(_.time.year, 10).domain(), [local(2000, 0, 1), local(2010, 0, 1)]);
      },
      "rounds using the specified count": function(scale) {
        var x = scale().domain([local(2009, 0, 1, 0, 17), local(2009, 0, 1, 23, 42)]);
        assert.deepEqual(x.nice(100).domain(), [local(2009, 0, 1, 0, 15), local(2009, 0, 1, 23, 45)]);
        assert.deepEqual(x.nice(10).domain(), [local(2009, 0, 1), local(2009, 0, 2)]);
      },
      "rounds with a default count of ten if no arguments": function(scale) {
        var x = scale().domain([local(2009, 0, 1, 0, 17), local(2009, 0, 1, 23, 42)]);
        assert.deepEqual(x.nice().domain(), [local(2009, 0, 1), local(2009, 0, 2)]);
      },
      "works on degenerate domains": function(scale) {
        var x = scale().domain([local(2009, 0, 1, 0, 12), local(2009, 0, 1, 0, 12)]);
        assert.deepEqual(x.nice(_.time.day).domain(), [local(2009, 0, 1), local(2009, 0, 2)]);
      },
      "nicing a polylinear domain only affects the extent": function(linear) {
        var x = linear().domain([local(2009, 0, 1, 0, 12), local(2009, 0, 1, 23, 48), local(2009, 0, 2, 23, 48)]).nice(_.time.day);
        assert.deepEqual(x.domain(), [local(2009, 0, 1), local(2009, 0, 1, 23, 48), local(2009, 0, 3)]);
      },
      "nice succeeds on sub-second intervals": function(scale) {
        var domain = [local(2013, 0, 1, 12, 0, 0), local(2013, 0, 1, 12, 0, 8)];
        var x = scale().domain(domain);
        assert.deepEqual(x.nice().domain(), domain);
      }
    },

    "copy": {
      "changes to the domain are isolated": function(scale) {
        var x = scale().domain([local(2009, 0, 1), local(2010, 0, 1)]), y = x.copy();
        x.domain([local(2010, 0, 1), local(2011, 0, 1)]);
        assert.deepEqual(y.domain(), [local(2009, 0, 1), local(2010, 0, 1)]);
        assert.equal(x(local(2010, 0, 1)), 0);
        assert.equal(y(local(2010, 0, 1)), 1);
        y.domain([local(2011, 0, 1), local(2012, 0, 1)]);
        assert.equal(x(local(2011, 0, 1)), 1);
        assert.equal(y(local(2011, 0, 1)), 0);
        assert.deepEqual(x.domain(), [local(2010, 0, 1), local(2011, 0, 1)]);
        assert.deepEqual(y.domain(), [local(2011, 0, 1), local(2012, 0, 1)]);
      },
      "changes to the range are isolated": function(scale) {
        var x = scale().domain([local(2009, 0, 1), local(2010, 0, 1)]), y = x.copy();
        x.range([1, 2]);
        assert.deepEqual(x.invert(1), local(2009, 0, 1));
        assert.deepEqual(y.invert(1), local(2010, 0, 1));
        assert.deepEqual(y.range(), [0, 1]);
        y.range([2, 3]);
        assert.deepEqual(x.invert(2), local(2010, 0, 1));
        assert.deepEqual(y.invert(2), local(2009, 0, 1));
        assert.deepEqual(x.range(), [1, 2]);
        assert.deepEqual(y.range(), [2, 3]);
      },
      "changes to the interpolator are isolated": function(scale) {
        var x = scale().domain([local(2009, 0, 1), local(2010, 0, 1)]).range(["red", "blue"]),
            i = x.interpolate(),
            y = x.copy();
        x.interpolate(_.interpolateHsl);
        assert.equal(x(local(2009, 6, 1)), "#ff00fd");
        assert.equal(y(local(2009, 6, 1)), "#81007e");
        assert.equal(y.interpolate(), i);
      },
      "changes to clamping are isolated": function(scale) {
        var x = scale().domain([local(2009, 0, 1), local(2010, 0, 1)]).clamp(true), y = x.copy();
        x.clamp(false);
        assert.equal(x(local(2011, 0, 1)), 2);
        assert.equal(y(local(2011, 0, 1)), 1);
        assert.isTrue(y.clamp());
        y.clamp(false);
        assert.equal(x(local(2011, 0, 1)), 2);
        assert.equal(y(local(2011, 0, 1)), 2);
        assert.isFalse(x.clamp());
      }
    },

    "ticks": {
      "observes explicit tick interval": function(scale) {
        var x = scale().domain([local(2011, 0, 1, 12, 1, 0), local(2011, 0, 1, 12, 4, 4)]);
        assert.deepEqual(x.ticks(_.time.minute), [
          local(2011, 0, 1, 12, 1),
          local(2011, 0, 1, 12, 2),
          local(2011, 0, 1, 12, 3),
          local(2011, 0, 1, 12, 4)
        ]);
      },
      "observes explicit tick interval and step": function(scale) {
        var x = scale().domain([local(2011, 0, 1, 12, 0, 0), local(2011, 0, 1, 12, 33, 4)]);
        assert.deepEqual(x.ticks(_.time.minute, 10), [
          local(2011, 0, 1, 12, 0),
          local(2011, 0, 1, 12, 10),
          local(2011, 0, 1, 12, 20),
          local(2011, 0, 1, 12, 30)
        ]);
      },
      "(deprecated) observes explicit tick range": function(scale) {
        var x = scale().domain([local(2011, 0, 1, 12, 1, 0), local(2011, 0, 1, 12, 4, 4)]);
        assert.deepEqual(x.ticks(_.time.minutes), [
          local(2011, 0, 1, 12, 1),
          local(2011, 0, 1, 12, 2),
          local(2011, 0, 1, 12, 3),
          local(2011, 0, 1, 12, 4)
        ]);
      },
      "(deprecated) observes explicit tick range and step": function(scale) {
        var x = scale().domain([local(2011, 0, 1, 12, 0, 0), local(2011, 0, 1, 12, 33, 4)]);
        assert.deepEqual(x.ticks(_.time.minutes, 10), [
          local(2011, 0, 1, 12, 0),
          local(2011, 0, 1, 12, 10),
          local(2011, 0, 1, 12, 20),
          local(2011, 0, 1, 12, 30)
        ]);
      },
      "generates sub-second ticks": function(scale) {
        var x = scale().domain([local(2011, 0, 1, 12, 0, 0), local(2011, 0, 1, 12, 0, 1)]);
        assert.deepEqual(x.ticks(4), [
          local(2011, 0, 1, 12, 0, 0,   0),
          local(2011, 0, 1, 12, 0, 0, 200),
          local(2011, 0, 1, 12, 0, 0, 400),
          local(2011, 0, 1, 12, 0, 0, 600),
          local(2011, 0, 1, 12, 0, 0, 800),
          local(2011, 0, 1, 12, 0, 1,   0)
        ]);
      },
      "generates 1-second ticks": function(scale) {
        var x = scale().domain([local(2011, 0, 1, 12, 0, 0), local(2011, 0, 1, 12, 0, 4)]);
        assert.deepEqual(x.ticks(4), [
          local(2011, 0, 1, 12, 0, 0),
          local(2011, 0, 1, 12, 0, 1),
          local(2011, 0, 1, 12, 0, 2),
          local(2011, 0, 1, 12, 0, 3),
          local(2011, 0, 1, 12, 0, 4)
        ]);
      },
      "generates 5-second ticks": function(scale) {
        var x = scale().domain([local(2011, 0, 1, 12, 0, 0), local(2011, 0, 1, 12, 0, 20)]);
        assert.deepEqual(x.ticks(4), [
          local(2011, 0, 1, 12, 0, 0),
          local(2011, 0, 1, 12, 0, 5),
          local(2011, 0, 1, 12, 0, 10),
          local(2011, 0, 1, 12, 0, 15),
          local(2011, 0, 1, 12, 0, 20)
        ]);
      },
      "generates 15-second ticks": function(scale) {
        var x = scale().domain([local(2011, 0, 1, 12, 0, 0), local(2011, 0, 1, 12, 0, 50)]);
        assert.deepEqual(x.ticks(4), [
          local(2011, 0, 1, 12, 0, 0),
          local(2011, 0, 1, 12, 0, 15),
          local(2011, 0, 1, 12, 0, 30),
          local(2011, 0, 1, 12, 0, 45)
        ]);
      },
      "generates 30-second ticks": function(scale) {
        var x = scale().domain([local(2011, 0, 1, 12, 0, 0), local(2011, 0, 1, 12, 1, 50)]);
        assert.deepEqual(x.ticks(4), [
          local(2011, 0, 1, 12, 0, 0),
          local(2011, 0, 1, 12, 0, 30),
          local(2011, 0, 1, 12, 1, 0),
          local(2011, 0, 1, 12, 1, 30)
        ]);
      },
      "generates 1-minute ticks": function(scale) {
        var x = scale().domain([local(2011, 0, 1, 12, 0, 27), local(2011, 0, 1, 12, 4, 12)]);
        assert.deepEqual(x.ticks(4), [
          local(2011, 0, 1, 12, 1),
          local(2011, 0, 1, 12, 2),
          local(2011, 0, 1, 12, 3),
          local(2011, 0, 1, 12, 4)
        ]);
      },
      "generates 5-minute ticks": function(scale) {
        var x = scale().domain([local(2011, 0, 1, 12, 3, 27), local(2011, 0, 1, 12, 21, 12)]);
        assert.deepEqual(x.ticks(4), [
          local(2011, 0, 1, 12, 5),
          local(2011, 0, 1, 12, 10),
          local(2011, 0, 1, 12, 15),
          local(2011, 0, 1, 12, 20)
        ]);
      },
      "generates 15-minute ticks": function(scale) {
        var x = scale().domain([local(2011, 0, 1, 12, 8, 27), local(2011, 0, 1, 13, 4, 12)]);
        assert.deepEqual(x.ticks(4), [
          local(2011, 0, 1, 12, 15),
          local(2011, 0, 1, 12, 30),
          local(2011, 0, 1, 12, 45),
          local(2011, 0, 1, 13, 0)
        ]);
      },
      "generates 30-minute ticks": function(scale) {
        var x = scale().domain([local(2011, 0, 1, 12, 28, 27), local(2011, 0, 1, 14, 4, 12)]);
        assert.deepEqual(x.ticks(4), [
          local(2011, 0, 1, 12, 30),
          local(2011, 0, 1, 13, 0),
          local(2011, 0, 1, 13, 30),
          local(2011, 0, 1, 14, 0)
        ]);
      },
      "generates 1-hour ticks": function(scale) {
        var x = scale().domain([local(2011, 0, 1, 12, 28, 27), local(2011, 0, 1, 16, 34, 12)]);
        assert.deepEqual(x.ticks(4), [
          local(2011, 0, 1, 13, 0),
          local(2011, 0, 1, 14, 0),
          local(2011, 0, 1, 15, 0),
          local(2011, 0, 1, 16, 0)
        ]);
      },
      "generates 3-hour ticks": function(scale) {
        var x = scale().domain([local(2011, 0, 1, 14, 28, 27), local(2011, 0, 2, 1, 34, 12)]);
        assert.deepEqual(x.ticks(4), [
          local(2011, 0, 1, 15, 0),
          local(2011, 0, 1, 18, 0),
          local(2011, 0, 1, 21, 0),
          local(2011, 0, 2, 0, 0)
        ]);
      },
      "generates 6-hour ticks": function(scale) {
        var x = scale().domain([local(2011, 0, 1, 16, 28, 27), local(2011, 0, 2, 14, 34, 12)]);
        assert.deepEqual(x.ticks(4), [
          local(2011, 0, 1, 18, 0),
          local(2011, 0, 2, 0, 0),
          local(2011, 0, 2, 6, 0),
          local(2011, 0, 2, 12, 0)
        ]);
      },
      "generates 12-hour ticks": function(scale) {
        var x = scale().domain([local(2011, 0, 1, 16, 28, 27), local(2011, 0, 3, 21, 34, 12)]);
        assert.deepEqual(x.ticks(4), [
          local(2011, 0, 2, 0, 0),
          local(2011, 0, 2, 12, 0),
          local(2011, 0, 3, 0, 0),
          local(2011, 0, 3, 12, 0)
        ]);
      },
      "generates 1-day ticks": function(scale) {
        var x = scale().domain([local(2011, 0, 1, 16, 28, 27), local(2011, 0, 5, 21, 34, 12)]);
        assert.deepEqual(x.ticks(4), [
          local(2011, 0, 2, 0, 0),
          local(2011, 0, 3, 0, 0),
          local(2011, 0, 4, 0, 0),
          local(2011, 0, 5, 0, 0)
        ]);
      },
      "generates 2-day ticks": function(scale) {
        var x = scale().domain([local(2011, 0, 2, 16, 28, 27), local(2011, 0, 9, 21, 34, 12)]);
        assert.deepEqual(x.ticks(4), [
          local(2011, 0, 3, 0, 0),
          local(2011, 0, 5, 0, 0),
          local(2011, 0, 7, 0, 0),
          local(2011, 0, 9, 0, 0)
        ]);
      },
      "generates 1-week ticks": function(scale) {
        var x = scale().domain([local(2011, 0, 1, 16, 28, 27), local(2011, 0, 23, 21, 34, 12)]);
        assert.deepEqual(x.ticks(4), [
          local(2011, 0, 2, 0, 0),
          local(2011, 0, 9, 0, 0),
          local(2011, 0, 16, 0, 0),
          local(2011, 0, 23, 0, 0)
        ]);
      },
      "generates 1-month ticks": function(scale) {
        var x = scale().domain([local(2011, 0, 18), local(2011, 4, 2)]);
        assert.deepEqual(x.ticks(4), [
          local(2011, 1, 1, 0, 0),
          local(2011, 2, 1, 0, 0),
          local(2011, 3, 1, 0, 0),
          local(2011, 4, 1, 0, 0)
        ]);
      },
      "generates 3-month ticks": function(scale) {
        var x = scale().domain([local(2010, 11, 18), local(2011, 10, 2)]);
        assert.deepEqual(x.ticks(4), [
          local(2011, 0, 1, 0, 0),
          local(2011, 3, 1, 0, 0),
          local(2011, 6, 1, 0, 0),
          local(2011, 9, 1, 0, 0)
        ]);
      },
      "generates 1-year ticks": function(scale) {
        var x = scale().domain([local(2010, 11, 18), local(2014, 2, 2)]);
        assert.deepEqual(x.ticks(4), [
          local(2011, 0, 1, 0, 0),
          local(2012, 0, 1, 0, 0),
          local(2013, 0, 1, 0, 0),
          local(2014, 0, 1, 0, 0)
        ]);
      },
      "generates multi-year ticks": function(scale) {
        var x = scale().domain([local(0, 11, 18), local(2014, 2, 2)]);
        assert.deepEqual(x.ticks(6), [
          local( 500, 0, 1, 0, 0),
          local(1000, 0, 1, 0, 0),
          local(1500, 0, 1, 0, 0),
          local(2000, 0, 1, 0, 0)
        ]);
      },
      "returns one tick for degenerate empty domain": function(scale) {
        var x = scale().domain([local(2014, 2, 2), local(2014, 2, 2)]);
        assert.deepEqual(x.ticks(6), [local(2014, 2, 2)]);
      }
    },

    "tickFormat": {
      topic: function(scale) {
        return scale().tickFormat();
      },
      "formats year on New Year's": function(format) {
        assert.equal(format(local(2011, 0, 1)), "2011");
        assert.equal(format(local(2012, 0, 1)), "2012");
        assert.equal(format(local(2013, 0, 1)), "2013");
      },
      "formats month on the 1st of each month": function(format) {
        assert.equal(format(local(2011, 1, 1)), "February");
        assert.equal(format(local(2011, 2, 1)), "March");
        assert.equal(format(local(2011, 3, 1)), "April");
      },
      "formats week on Sunday midnight": function(format) {
        assert.equal(format(local(2011, 1, 6)), "Feb 06");
        assert.equal(format(local(2011, 1, 13)), "Feb 13");
        assert.equal(format(local(2011, 1, 20)), "Feb 20");
      },
      "formats date on midnight": function(format) {
        assert.equal(format(local(2011, 1, 2)), "Wed 02");
        assert.equal(format(local(2011, 1, 3)), "Thu 03");
        assert.equal(format(local(2011, 1, 4)), "Fri 04");
      },
      "formats hour on minute zero": function(format) {
        assert.equal(format(local(2011, 1, 2, 11)), "11 AM");
        assert.equal(format(local(2011, 1, 2, 12)), "12 PM");
        assert.equal(format(local(2011, 1, 2, 13)), "01 PM");
      },
      "formats minute on second zero": function(format) {
        assert.equal(format(local(2011, 1, 2, 11, 59)), "11:59");
        assert.equal(format(local(2011, 1, 2, 12,  1)), "12:01");
        assert.equal(format(local(2011, 1, 2, 12,  2)), "12:02");
      },
      "otherwise, formats second": function(format) {
        assert.equal(format(local(2011, 1, 2, 12,  1,  9)), ":09");
        assert.equal(format(local(2011, 1, 2, 12,  1, 10)), ":10");
        assert.equal(format(local(2011, 1, 2, 12,  1, 11)), ":11");
      }
    }
  }
});

suite.addBatch({
  "scale.utc": {
    topic: load("time/scale-utc").expression("d3.time.scale.utc").document(),

    "nice": {
      "rounds using the specified time interval": function(scale) {
        var x = scale().domain([utc(2009, 0, 1, 0, 12), utc(2009, 0, 1, 23, 48)]);
        assert.deepEqual(x.nice(_.time.day.utc).domain(), [utc(2009, 0, 1), utc(2009, 0, 2)]);
        assert.deepEqual(x.nice(_.time.week.utc).domain(), [utc(2008, 11, 28), utc(2009, 0, 4)]);
        assert.deepEqual(x.nice(_.time.month.utc).domain(), [utc(2008, 11, 1), utc(2009, 1, 1)]);
        assert.deepEqual(x.nice(_.time.year.utc).domain(), [utc(2008, 0, 1), utc(2010, 0, 1)]);
      },
      "rounds using the specified time interval and skip": function(scale) {
        var x = scale().domain([utc(2009, 0, 1, 0, 12), utc(2009, 0, 1, 23, 48)]);
        assert.deepEqual(x.nice(_.time.day.utc, 3).domain(), [utc(2009, 0, 1), utc(2009, 0, 4)]);
        assert.deepEqual(x.nice(_.time.week.utc, 2).domain(), [utc(2008, 11, 21), utc(2009, 0, 4)]);
        assert.deepEqual(x.nice(_.time.month.utc, 3).domain(), [utc(2008, 9, 1), utc(2009, 3, 1)]);
        assert.deepEqual(x.nice(_.time.year.utc, 10).domain(), [utc(2000, 0, 1), utc(2010, 0, 1)]);
      },
      "rounds using the specified count": function(scale) {
        var x = scale().domain([utc(2009, 0, 1, 0, 17), utc(2009, 0, 1, 23, 42)]);
        assert.deepEqual(x.nice(100).domain(), [utc(2009, 0, 1, 0, 15), utc(2009, 0, 1, 23, 45)]);
        assert.deepEqual(x.nice(10).domain(), [utc(2009, 0, 1), utc(2009, 0, 2)]);
      },
      "rounds with a default count of ten if no arguments": function(scale) {
        var x = scale().domain([utc(2009, 0, 1, 0, 17), utc(2009, 0, 1, 23, 42)]);
        assert.deepEqual(x.nice().domain(), [utc(2009, 0, 1), utc(2009, 0, 2)]);
      },
      "works on degenerate domains": function(scale) {
        var x = scale().domain([utc(2009, 0, 1, 0, 12), utc(2009, 0, 1, 0, 12)]);
        assert.deepEqual(x.nice(_.time.day.utc).domain(), [utc(2009, 0, 1), utc(2009, 0, 2)]);
      },
      "nicing a polylinear domain only affects the extent": function(linear) {
        var x = linear().domain([utc(2009, 0, 1, 0, 12), utc(2009, 0, 1, 23, 48), utc(2009, 0, 2, 23, 48)]).nice(_.time.day.utc);
        assert.deepEqual(x.domain(), [utc(2009, 0, 1), utc(2009, 0, 1, 23, 48), utc(2009, 0, 3)]);
      }
    },

    "ticks": {
      "observes explicit tick interval": function(scale) {
        var x = scale().domain([utc(2011, 0, 1, 12, 1, 0), utc(2011, 0, 1, 12, 4, 4)]);
        assert.deepEqual(x.ticks(_.time.minute.utc), [
          utc(2011, 0, 1, 12, 1),
          utc(2011, 0, 1, 12, 2),
          utc(2011, 0, 1, 12, 3),
          utc(2011, 0, 1, 12, 4)
        ]);
      },
      "observes explicit tick interval and step": function(scale) {
        var x = scale().domain([utc(2011, 0, 1, 12, 0, 0), utc(2011, 0, 1, 12, 33, 4)]);
        assert.deepEqual(x.ticks(_.time.minute.utc, 10), [
          utc(2011, 0, 1, 12, 0),
          utc(2011, 0, 1, 12, 10),
          utc(2011, 0, 1, 12, 20),
          utc(2011, 0, 1, 12, 30)
        ]);
      },
      "(deprecated) observes explicit tick range": function(scale) {
        var x = scale().domain([utc(2011, 0, 1, 12, 1, 0), utc(2011, 0, 1, 12, 4, 4)]);
        assert.deepEqual(x.ticks(_.time.minutes.utc), [
          utc(2011, 0, 1, 12, 1),
          utc(2011, 0, 1, 12, 2),
          utc(2011, 0, 1, 12, 3),
          utc(2011, 0, 1, 12, 4)
        ]);
      },
      "(deprecated) observes explicit tick range and step": function(scale) {
        var x = scale().domain([utc(2011, 0, 1, 12, 0, 0), utc(2011, 0, 1, 12, 33, 4)]);
        assert.deepEqual(x.ticks(_.time.minutes.utc, 10), [
          utc(2011, 0, 1, 12, 0),
          utc(2011, 0, 1, 12, 10),
          utc(2011, 0, 1, 12, 20),
          utc(2011, 0, 1, 12, 30)
        ]);
      },
      "generates sub-second ticks": function(scale) {
        var x = scale().domain([utc(2011, 0, 1, 12, 0, 0), utc(2011, 0, 1, 12, 0, 1)]);
        assert.deepEqual(x.ticks(4), [
          utc(2011, 0, 1, 12, 0, 0,   0),
          utc(2011, 0, 1, 12, 0, 0, 200),
          utc(2011, 0, 1, 12, 0, 0, 400),
          utc(2011, 0, 1, 12, 0, 0, 600),
          utc(2011, 0, 1, 12, 0, 0, 800),
          utc(2011, 0, 1, 12, 0, 1,   0)
        ]);
      },
      "generates 1-second ticks": function(scale) {
        var x = scale().domain([utc(2011, 0, 1, 12, 0, 0), utc(2011, 0, 1, 12, 0, 4)]);
        assert.deepEqual(x.ticks(4), [
          utc(2011, 0, 1, 12, 0, 0),
          utc(2011, 0, 1, 12, 0, 1),
          utc(2011, 0, 1, 12, 0, 2),
          utc(2011, 0, 1, 12, 0, 3),
          utc(2011, 0, 1, 12, 0, 4)
        ]);
      },
      "generates 5-second ticks": function(scale) {
        var x = scale().domain([utc(2011, 0, 1, 12, 0, 0), utc(2011, 0, 1, 12, 0, 20)]);
        assert.deepEqual(x.ticks(4), [
          utc(2011, 0, 1, 12, 0, 0),
          utc(2011, 0, 1, 12, 0, 5),
          utc(2011, 0, 1, 12, 0, 10),
          utc(2011, 0, 1, 12, 0, 15),
          utc(2011, 0, 1, 12, 0, 20)
        ]);
      },
      "generates 15-second ticks": function(scale) {
        var x = scale().domain([utc(2011, 0, 1, 12, 0, 0), utc(2011, 0, 1, 12, 0, 50)]);
        assert.deepEqual(x.ticks(4), [
          utc(2011, 0, 1, 12, 0, 0),
          utc(2011, 0, 1, 12, 0, 15),
          utc(2011, 0, 1, 12, 0, 30),
          utc(2011, 0, 1, 12, 0, 45)
        ]);
      },
      "generates 30-second ticks": function(scale) {
        var x = scale().domain([utc(2011, 0, 1, 12, 0, 0), utc(2011, 0, 1, 12, 1, 50)]);
        assert.deepEqual(x.ticks(4), [
          utc(2011, 0, 1, 12, 0, 0),
          utc(2011, 0, 1, 12, 0, 30),
          utc(2011, 0, 1, 12, 1, 0),
          utc(2011, 0, 1, 12, 1, 30)
        ]);
      },
      "generates 1-minute ticks": function(scale) {
        var x = scale().domain([utc(2011, 0, 1, 12, 0, 27), utc(2011, 0, 1, 12, 4, 12)]);
        assert.deepEqual(x.ticks(4), [
          utc(2011, 0, 1, 12, 1),
          utc(2011, 0, 1, 12, 2),
          utc(2011, 0, 1, 12, 3),
          utc(2011, 0, 1, 12, 4)
        ]);
      },
      "generates 5-minute ticks": function(scale) {
        var x = scale().domain([utc(2011, 0, 1, 12, 3, 27), utc(2011, 0, 1, 12, 21, 12)]);
        assert.deepEqual(x.ticks(4), [
          utc(2011, 0, 1, 12, 5),
          utc(2011, 0, 1, 12, 10),
          utc(2011, 0, 1, 12, 15),
          utc(2011, 0, 1, 12, 20)
        ]);
      },
      "generates 15-minute ticks": function(scale) {
        var x = scale().domain([utc(2011, 0, 1, 12, 8, 27), utc(2011, 0, 1, 13, 4, 12)]);
        assert.deepEqual(x.ticks(4), [
          utc(2011, 0, 1, 12, 15),
          utc(2011, 0, 1, 12, 30),
          utc(2011, 0, 1, 12, 45),
          utc(2011, 0, 1, 13, 0)
        ]);
      },
      "generates 30-minute ticks": function(scale) {
        var x = scale().domain([utc(2011, 0, 1, 12, 28, 27), utc(2011, 0, 1, 14, 4, 12)]);
        assert.deepEqual(x.ticks(4), [
          utc(2011, 0, 1, 12, 30),
          utc(2011, 0, 1, 13, 0),
          utc(2011, 0, 1, 13, 30),
          utc(2011, 0, 1, 14, 0)
        ]);
      },
      "generates 1-hour ticks": function(scale) {
        var x = scale().domain([utc(2011, 0, 1, 12, 28, 27), utc(2011, 0, 1, 16, 34, 12)]);
        assert.deepEqual(x.ticks(4), [
          utc(2011, 0, 1, 13, 0),
          utc(2011, 0, 1, 14, 0),
          utc(2011, 0, 1, 15, 0),
          utc(2011, 0, 1, 16, 0)
        ]);
      },
      "generates 3-hour ticks": function(scale) {
        var x = scale().domain([utc(2011, 0, 1, 14, 28, 27), utc(2011, 0, 2, 1, 34, 12)]);
        assert.deepEqual(x.ticks(4), [
          utc(2011, 0, 1, 15, 0),
          utc(2011, 0, 1, 18, 0),
          utc(2011, 0, 1, 21, 0),
          utc(2011, 0, 2, 0, 0)
        ]);
      },
      "generates 6-hour ticks": function(scale) {
        var x = scale().domain([utc(2011, 0, 1, 16, 28, 27), utc(2011, 0, 2, 14, 34, 12)]);
        assert.deepEqual(x.ticks(4), [
          utc(2011, 0, 1, 18, 0),
          utc(2011, 0, 2, 0, 0),
          utc(2011, 0, 2, 6, 0),
          utc(2011, 0, 2, 12, 0)
        ]);
      },
      "generates 12-hour ticks": function(scale) {
        var x = scale().domain([utc(2011, 0, 1, 16, 28, 27), utc(2011, 0, 3, 21, 34, 12)]);
        assert.deepEqual(x.ticks(4), [
          utc(2011, 0, 2, 0, 0),
          utc(2011, 0, 2, 12, 0),
          utc(2011, 0, 3, 0, 0),
          utc(2011, 0, 3, 12, 0)
        ]);
      },
      "generates 1-day ticks": function(scale) {
        var x = scale().domain([utc(2011, 0, 1, 16, 28, 27), utc(2011, 0, 5, 21, 34, 12)]);
        assert.deepEqual(x.ticks(4), [
          utc(2011, 0, 2, 0, 0),
          utc(2011, 0, 3, 0, 0),
          utc(2011, 0, 4, 0, 0),
          utc(2011, 0, 5, 0, 0)
        ]);
      },
      "generates 2-day ticks": function(scale) {
        var x = scale().domain([utc(2011, 0, 2, 16, 28, 27), utc(2011, 0, 9, 21, 34, 12)]);
        assert.deepEqual(x.ticks(4), [
          utc(2011, 0, 3, 0, 0),
          utc(2011, 0, 5, 0, 0),
          utc(2011, 0, 7, 0, 0),
          utc(2011, 0, 9, 0, 0)
        ]);
      },
      "generates 1-week ticks": function(scale) {
        var x = scale().domain([utc(2011, 0, 1, 16, 28, 27), utc(2011, 0, 23, 21, 34, 12)]);
        assert.deepEqual(x.ticks(4), [
          utc(2011, 0, 2, 0, 0),
          utc(2011, 0, 9, 0, 0),
          utc(2011, 0, 16, 0, 0),
          utc(2011, 0, 23, 0, 0)
        ]);
      },
      "generates 1-month ticks": function(scale) {
        var x = scale().domain([utc(2011, 0, 18), utc(2011, 4, 2)]);
        assert.deepEqual(x.ticks(4), [
          utc(2011, 1, 1, 0, 0),
          utc(2011, 2, 1, 0, 0),
          utc(2011, 3, 1, 0, 0),
          utc(2011, 4, 1, 0, 0)
        ]);
      },
      "generates 3-month ticks": function(scale) {
        var x = scale().domain([utc(2010, 11, 18), utc(2011, 10, 2)]);
        assert.deepEqual(x.ticks(4), [
          utc(2011, 0, 1, 0, 0),
          utc(2011, 3, 1, 0, 0),
          utc(2011, 6, 1, 0, 0),
          utc(2011, 9, 1, 0, 0)
        ]);
      },
      "generates 1-year ticks": function(scale) {
        var x = scale().domain([utc(2010, 11, 18), utc(2014, 2, 2)]);
        assert.deepEqual(x.ticks(4), [
          utc(2011, 0, 1, 0, 0),
          utc(2012, 0, 1, 0, 0),
          utc(2013, 0, 1, 0, 0),
          utc(2014, 0, 1, 0, 0)
        ]);
      },
      "generates multi-year ticks": function(scale) {
        var x = scale().domain([utc(0, 11, 18), utc(2014, 2, 2)]);
        assert.deepEqual(x.ticks(6), [
          utc( 500, 0, 1, 0, 0),
          utc(1000, 0, 1, 0, 0),
          utc(1500, 0, 1, 0, 0),
          utc(2000, 0, 1, 0, 0)
        ]);
      },
      "returns one tick for degenerate empty domain": function(scale) {
        var x = scale().domain([utc(2014, 2, 2), utc(2014, 2, 2)]);
        assert.deepEqual(x.ticks(6), [utc(2014, 2, 2)]);
      }
    },

    "tickFormat": {
      topic: function(scale) {
        return scale().tickFormat();
      },
      "formats year on New Year's": function(format) {
        assert.equal(format(utc(2011, 0, 1)), "2011");
        assert.equal(format(utc(2012, 0, 1)), "2012");
        assert.equal(format(utc(2013, 0, 1)), "2013");
      },
      "formats month on the 1st of each month": function(format) {
        assert.equal(format(utc(2011, 1, 1)), "February");
        assert.equal(format(utc(2011, 2, 1)), "March");
        assert.equal(format(utc(2011, 3, 1)), "April");
      },
      "formats week on Sunday midnight": function(format) {
        assert.equal(format(utc(2011, 1, 6)), "Feb 06");
        assert.equal(format(utc(2011, 1, 13)), "Feb 13");
        assert.equal(format(utc(2011, 1, 20)), "Feb 20");
      },
      "formats date on midnight": function(format) {
        assert.equal(format(utc(2011, 1, 2)), "Wed 02");
        assert.equal(format(utc(2011, 1, 3)), "Thu 03");
        assert.equal(format(utc(2011, 1, 4)), "Fri 04");
      },
      "formats hour on minute zero": function(format) {
        assert.equal(format(utc(2011, 1, 2, 11)), "11 AM");
        assert.equal(format(utc(2011, 1, 2, 12)), "12 PM");
        assert.equal(format(utc(2011, 1, 2, 13)), "01 PM");
      },
      "formats minute on second zero": function(format) {
        assert.equal(format(utc(2011, 1, 2, 11, 59)), "11:59");
        assert.equal(format(utc(2011, 1, 2, 12,  1)), "12:01");
        assert.equal(format(utc(2011, 1, 2, 12,  2)), "12:02");
      },
      "formats second on millisecond zero": function(format) {
        assert.equal(format(utc(2011, 1, 2, 12,  1,  9)), ":09");
        assert.equal(format(utc(2011, 1, 2, 12,  1, 10)), ":10");
        assert.equal(format(utc(2011, 1, 2, 12,  1, 11)), ":11");
      },
      "otherwise, formats milliseconds": function(format) {
        assert.equal(format(utc(2011, 1, 2, 12,  1,  0,   9)), ".009");
        assert.equal(format(utc(2011, 1, 2, 12,  1,  0,  10)), ".010");
        assert.equal(format(utc(2011, 1, 2, 12,  1,  0,  11)), ".011");
      }
    }
  }
});

suite.export(module);