[Scrolling] Fill in specs

Fill in specs for ScrollingListController, and for
the specific Column types that support it. Separate
out the code that produces actual rows in order to
improve testability and maintainability. WTD-534.

platform/features/scrolling/test/DomainColumnSpec.js

@@ -9,6 +9,38 @@ define(
         "use strict";
 
         describe("A domain column", function () {
+            var mockDataSet,
+                testMetadata,
+                column;
+
+            beforeEach(function () {
+                mockDataSet = jasmine.createSpyObj(
+                    "data",
+                    [ "getDomainValue" ]
+                );
+                testMetadata = {
+                    key: "testKey",
+                    name: "Test Name"
+                };
+                column = new DomainColumn(testMetadata);
+            });
+
+            it("reports a column header from domain metadata", function () {
+                expect(column.getTitle()).toEqual("Test Name");
+            });
+
+            it("looks up data from a data set", function () {
+                column.getValue(undefined, mockDataSet, 42);
+                expect(mockDataSet.getDomainValue)
+                    .toHaveBeenCalledWith(42, "testKey");
+            });
+
+            it("formats domain values as time", function () {
+                mockDataSet.getDomainValue.andReturn(402513731000);
+                expect(column.getValue(undefined, mockDataSet, 42))
+                    .toEqual("1982-276 17:22:11");
+            });
+
         });
     }
 );