var vows = require(“vows”),

load = require("../load"),
assert = require("../assert");

var suite = vows.describe(“selection.each”);

suite.addBatch({

"select(body)": {
  topic: load("selection/each").document(),
  "on a simple page": {
    topic: function(d3) {
      return d3.select("body");
    },
    "calls the function once per element": function(body) {
      var count = 0;
      body.each(function() { ++count; });
      assert.equal(count, 1);
    },
    "passes the data and index to the function": function(body) {
      var data = new Object(), dd, ii;
      body.data([data]).each(function(d, i) { dd = d; ii = i; });
      assert.isTrue(dd === data);
      assert.isTrue(ii === 0);
    },
    "uses the node as the context": function(body) {
      var node;
      body.each(function() { node = this; });
      assert.isTrue(node === body.node());
    },
    "returns the same selection": function(body) {
      assert.isTrue(body.each(function() {}) === body);
    },
    "returns the current selection": function(body) {
      assert.isTrue(body.each(function() {}) === body);
    },
    "ignores null nodes": function(body) {
      var count = 0;
      body[0][0] = null;
      body.each(function() { ++count; });
      assert.equal(count, 0);
    }
  }
}

});

suite.addBatch({

"selectAll(div)": {
  topic: load("selection/each").document(),
  "on a simple page": {
    topic: function(d3) {
      return d3.select("body").selectAll("div").data([0, 1]).enter().append("div");
    },
    "calls the function once per element": function(div) {
      var count = 0;
      div.each(function() { ++count; });
      assert.equal(count, 2);
    },
    "passes the data and index to the function": function(div) {
      var data = [new Object(), new Object()], dd = [], ii = [];
      div.data(data).each(function(d, i) { dd.push(d); ii.push(i); });
      assert.deepEqual(dd, data);
      assert.deepEqual(ii, [0, 1]);
    },
    "uses the node as the context": function(div) {
      var nodes = [];
      div.each(function() { nodes.push(this); });
      assert.equal(nodes.length, 2);
      assert.isTrue(div[0][0] == nodes[0]);
      assert.isTrue(div[0][1] == nodes[1]);
    },
    "returns the same selection": function(div) {
      assert.isTrue(div.each(function() {}) === div);
    },
    "returns the current selection": function(div) {
      assert.isTrue(div.each(function() {}) === div);
    },
    "ignores null nodes": function(div) {
      var count = 0;
      div[0][0] = null;
      div.each(function() { ++count; });
      assert.equal(count, 1);
    }
  }
}

});

suite.export(module);