require("../env");

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

var vows = require("vows"),

    assert = require("assert");

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

suite.addBatch({

  "max": {

    topic: function() {

      return d3.max;

    },

    "returns the greatest numeric value for numbers": function(max) {

      assert.equal(max([1]), 1);

      assert.equal(max([5, 1, 2, 3, 4]), 5);

      assert.equal(max([20, 3]), 20);

      assert.equal(max([3, 20]), 20);

    },

    "returns the greatest lexicographic value for strings": function(max) {

      assert.equal(max(["c", "a", "b"]), "c");

      assert.equal(max(["20", "3"]), "3");

      assert.equal(max(["3", "20"]), "3");

    },

    "ignores null, undefined and NaN": function(max) {

      assert.equal(max([NaN, 1, 2, 3, 4, 5]), 5);

      assert.equal(max([1, 2, 3, 4, 5, NaN]), 5);

      assert.equal(max([10, null, 3, undefined, 5, NaN]), 10);

      assert.equal(max([-1, null, -3, undefined, -5, NaN]), -1);

    },

    "compares heterogenous types as numbers": function(max) {

      assert.strictEqual(max([20, "3"]), 20);

      assert.strictEqual(max(["20", 3]), "20");

      assert.strictEqual(max([3, "20"]), "20");

      assert.strictEqual(max(["3", 20]), 20);

    },

    "returns undefined for empty array": function(max) {

      assert.isUndefined(max([]));

      assert.isUndefined(max([null]));

      assert.isUndefined(max([undefined]));

      assert.isUndefined(max([NaN]));

      assert.isUndefined(max([NaN, NaN]));

    },

    "applies the optional accessor function": function(max) {

      assert.equal(d3.max([[1, 2, 3, 4, 5], [2, 4, 6, 8, 10]], function(d) { return d3.min(d); }), 2);

      assert.equal(d3.max([1, 2, 3, 4, 5], function(d, i) { return i; }), 4);

    }

  }

});

suite.export(module);