d3-jsnext/test/core/functor-test.js

d3, but futuristic

require( 'babel/register' );

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

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

suite.addBatch({
  "functor": {
    topic: load("core/functor").expression("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);