require("../env");

require("../../d3");

var vows = require("vows"),

    assert = require("assert");

var suite = vows.describe("d3.round");

suite.addBatch({

  "round": {

    topic: function() {

      return d3.round;

    },

    "returns a number": function(round) {

      assert.isNumber(round(42));

    },

    "returns zero for zero": function(round) {

      assert.equal(round(0), 0);

    },

    "ignores degenerate input": function(round) {

      assert.isNaN(round(NaN));

      assert.equal(round(Infinity), Infinity);

      assert.equal(round(-Infinity), -Infinity);

    },

    "returns integers by default": function(round) {

      assert.equal(round(10.6), 11);

      assert.equal(round(10.4), 10);

      assert.equal(round(0.6), 1);

      assert.equal(round(0.4), 0);

      assert.equal(round(-0.6), -1);

      assert.equal(round(-0.4), 0);

      assert.equal(round(-10.6), -11);

      assert.equal(round(-10.4), -10);

    },

    "rounds to the specified decimal place": function(round) {

      assert.inDelta(round(10.56, 1), 10.6, 1e-6);

      assert.inDelta(round(10.54, 1), 10.5, 1e-6);

      assert.inDelta(round(0.56, 1), 0.6, 1e-6);

      assert.inDelta(round(0.54, 1), 0.5, 1e-6);

      assert.inDelta(round(-0.56, 1), -0.6, 1e-6);

      assert.inDelta(round(-0.54, 1), -0.5, 1e-6);

      assert.inDelta(round(-10.56, 1), -10.6, 1e-6);

      assert.inDelta(round(-10.54, 1), -10.5, 1e-6);

      assert.inDelta(round(10.556, 2), 10.56, 1e-6);

      assert.inDelta(round(10.554, 2), 10.55, 1e-6);

      assert.inDelta(round(0.556, 2), 0.56, 1e-6);

      assert.inDelta(round(0.554, 2), 0.55, 1e-6);

      assert.inDelta(round(-0.556, 2), -0.56, 1e-6);

      assert.inDelta(round(-0.554, 2), -0.55, 1e-6);

      assert.inDelta(round(-10.556, 2), -10.56, 1e-6);

      assert.inDelta(round(-10.554, 2), -10.55, 1e-6);

    },

    "rounds to the specified significant digits": function(round) {

      assert.equal(round(123.45, -1), 120);

      assert.equal(round(345.67, -1), 350);

      assert.equal(round(-123.45, -1), -120);

      assert.equal(round(-345.67, -1), -350);

      assert.equal(round(123.45, -2), 100);

      assert.equal(round(456.78, -2), 500);

      assert.equal(round(-123.45, -2), -100);

      assert.equal(round(-456.78, -2), -500);

      assert.equal(round(123.45, -3), 0);

      assert.equal(round(567.89, -3), 1000);

      assert.equal(round(-123.45, -3), 0);

      assert.equal(round(-567.89, -3), -1000);

    }

  }

});

suite.export(module);