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require("../env");

var vows = require("vows"),
    assert = require("assert");

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

suite.addBatch({
  "functor": {
    topic: function() {
      return d3.functor;
    },
    "when passed a function, returns the function": function(functor) {
      function foo() {}
      assert.strictEqual(functor(foo), foo);
    },
    "when passed a non-function, returns a wrapper function": function(functor) {
      var a = {};
      assert.isNull(functor(null)());
      assert.isUndefined(functor(undefined)());
      assert.strictEqual(functor(a)(), a);
      assert.strictEqual(functor(1)(), 1);
      assert.deepEqual(functor([1])(), [1]);
    }
  }
});

suite.export(module);
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