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require("../env");

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);
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