require("../env");

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

var vows = require("vows"),

    assert = require("assert");

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

suite.addBatch({

  "keys": {

    topic: function() {

      return d3.keys;

    },

    "enumerates every defined key": function(keys) {

      assert.deepEqual(keys({a: 1, b: 1}), ["a", "b"]);

    },

    "includes keys defined on prototypes": function(keys) {

      function abc() {

        this.a = 1;

        this.b = 2;

      }

      abc.prototype.c = 3;

      assert.deepEqual(keys(new abc()), ["a", "b", "c"]);

    },

    "includes keys with null or undefined values": function(keys) {

      assert.deepEqual(keys({a: undefined, b: null, c: NaN}), ["a", "b", "c"]);

    }

  }

});

suite.export(module);