require("../env");

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

var vows = require("vows"),

    assert = require("assert");

var suite = vows.describe("selection.call");

suite.addBatch({

  "select(body)": {

    topic: function() {

      return d3.select("body").html("");

    },

    "calls the function once": function(body) {

      var count = 0;

      body.call(function() { ++count; });

      assert.equal(count, 1);

    },

    "passes any optional arguments": function(body) {

      var abc;

      body.call(function(selection, a, b, c) { abc = [a, b, c]; }, "a", "b", "c");

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

    },

    "passes the selection as the first argument": function(body) {

      var s;

      body.call(function(selection) { s = selection; });

      assert.isTrue(s === body);

    },

    "uses the selection as the context": function(body) {

      var s;

      body.call(function() { s = this; });

      assert.isTrue(s === body);

    },

    "returns the current selection": function(body) {

      assert.isTrue(body.call(function() {}) === body);

    }

  }

});

suite.addBatch({

  "selectAll(div)": {

    topic: function() {

      return d3.select("body").html("").selectAll("div").data(d3.range(2)).enter().append("div");

    },

    "calls the function once": function(div) {

      var count = 0;

      div.call(function() { ++count; });

      assert.equal(count, 1);

    },

    "passes any optional arguments": function(div) {

      var abc;

      div.call(function(selection, a, b, c) { abc = [a, b, c]; }, "a", "b", "c");

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

    },

    "passes the selection as the first argument": function(div) {

      var s;

      div.call(function(selection) { s = selection; });

      assert.isTrue(s === div);

    },

    "uses the selection as the context": function(div) {

      var s;

      div.call(function() { s = this; });

      assert.isTrue(s === div);

    },

    "returns the current selection": function(div) {

      assert.isTrue(div.call(function() {}) === div);

    }

  }

});

suite.export(module);