old_contents: (function () {
  
      "use strict";
  
      describe("laces array", function () {
  
          /* global LacesArray */
  
          var array,
              event,
              storeEvent = function(e) { event = e; };
  
          beforeEach(function() {
              array = new LacesArray([1, 2, 3]);
          });
  
          it("supports add", function() {
              array.bind("add", storeEvent);
              array.push(4);
  
              assert.deepEqual(array, [1, 2, 3, 4]);
  
              assert.deepEqual(event, {
                  elements: [4],
                  index: 3,
                  name: "add"
              });
          });
  
          it("supports remove", function() {
              array.bind("remove", storeEvent);
              array.remove(2);
  
              assert.deepEqual(array, [1, 2]);
  
              assert.deepEqual(event, {
                  elements: [3],
                  index: 2,
                  name: "remove"
              });
          });
      });
  })();
  
new_contents: (function () {
  
      "use strict";
  
      describe("laces array", function () {
  
          /* global LacesArray */
  
          var array,
              event,
              storeEvent = function(e) { event = e; };
  
          beforeEach(function() {
              array = new LacesArray([1, 2, 3]);
          });
  
          it("supports add", function() {
              array.bind("add", storeEvent);
              array.push(4);
  
              assert.deepEqual(array, [1, 2, 3, 4]);
  
              assert.deepEqual(event, {
                  elements: [4],
                  index: 3,
                  name: "add"
              });
          });
  
          it("supports remove", function() {
              array.bind("remove", storeEvent);
              array.remove(2);
  
              assert.deepEqual(array, [1, 2]);
  
              assert.deepEqual(event, {
                  elements: [3],
                  index: 2,
                  name: "remove"
              });
          });
  
          it("supports map elements", function() {
              array.bind("add", storeEvent);
              array.push(new LacesMap({ a: 1, b: 2 }));
  
              assert.deepEqual(array, [1, 2, 3, { a: 1, b: 2 }]);
  
              assert.deepEqual(event, {
                  elements: [{ a: 1, b: 2 }],
                  index: 3,
                  name: "add"
              });
          });
      });
  })();
  
subject: Add test case.