[Scrolling] Complete specs for scrolling lists

Complete specs for scrolling list views, WTD-534.

platform/features/scrolling/test/ScrollingListPopulatorSpec.js

@@ -0,0 +1,84 @@
+/*global define,describe,it,expect,beforeEach,waitsFor,jasmine*/
+
+/**
+ * MergeModelsSpec. Created by vwoeltje on 11/6/14.
+ */
+define(
+    ["../src/ScrollingListPopulator"],
+    function (ScrollingListPopulator) {
+        "use strict";
+
+        describe("The scrolling list populator", function () {
+            var mockColumns,
+                mockDatas,
+                mockDomainObjects,
+                populator;
+
+            function makeMockColumn(name, index) {
+                var mockColumn = jasmine.createSpyObj(
+                    "column" + index,
+                    [ "getTitle", "getValue" ]
+                );
+                mockColumn.getTitle.andReturn(name);
+                mockColumn.getValue.andCallFake(function (obj, data, i) {
+                    return data.getDomainValue(i);
+                });
+                return mockColumn;
+            }
+
+            function makeMockData(bias, index) {
+                var mockData = jasmine.createSpyObj(
+                    "data" + index,
+                    [ "getDomainValue", "getPointCount" ]
+                );
+                mockData.getPointCount.andReturn(1000);
+                mockData.getDomainValue.andCallFake(function (i) {
+                    return i + bias;
+                });
+                return mockData;
+            }
+
+            function makeMockDomainObject(name, index) {
+                var mockDomainObject = jasmine.createSpyObj(
+                    "domainObject" + index,
+                    [ "getId", "getModel" ]
+                );
+                return mockDomainObject;
+            }
+
+            beforeEach(function () {
+                mockColumns = ["A", "B", "C", "D"].map(makeMockColumn);
+                mockDatas = [ 10, 0, 3 ].map(makeMockData);
+                mockDomainObjects = ["A", "B", "C"].map(makeMockDomainObject);
+                populator = new ScrollingListPopulator(mockColumns);
+            });
+
+            it("returns column headers", function () {
+                expect(populator.getHeaders()).toEqual(["A", "B", "C", "D"]);
+            });
+
+            it("provides rows on request, with all columns in each row", function () {
+                var rows = populator.getRows(mockDatas, mockDomainObjects, 84);
+                expect(rows.length).toEqual(84);
+                rows.forEach(function (row) {
+                    expect(row.length).toEqual(4); // number of columns
+                });
+            });
+
+            it("returns rows in reverse domain order", function () {
+                var rows = populator.getRows(mockDatas, mockDomainObjects, 84),
+                    previous = Number.POSITIVE_INFINITY;
+
+                // Should always be most-recent-first; since the mockColumn
+                // returns the domain value, column contents should be
+                // non-increasing.
+                rows.forEach(function (row) {
+                    expect(row[0]).not.toBeGreaterThan(previous);
+                    previous = row[0];
+                });
+
+            });
+
+        });
+    }
+);

platform/features/scrolling/test/suite.json

@@ -2,5 +2,6 @@
     "DomainColumn",
     "NameColumn",
     "RangeColumn",
-    "ScrollingListController"
+    "ScrollingListController",
+    "ScrollingListPopulator"
 ]