[Plot] Add test cases

Add test cases for plot line management, WTD-806.

platform/features/plot/test/elements/PlotSeriesWindowSpec.js

@@ -6,6 +6,68 @@ define(
         "use strict";
 
         describe("A plot's window on a telemetry series", function () {
+            var mockSeries,
+                testSeries,
+                window;
+
+            beforeEach(function () {
+                testSeries = [
+                    [ 0, 42 ],
+                    [ 10, 1 ],
+                    [ 20, 4 ],
+                    [ 30, 9 ],
+                    [ 40, 3 ]
+                ];
+
+                mockSeries = jasmine.createSpyObj(
+                    'series',
+                    ['getPointCount', 'getDomainValue', 'getRangeValue']
+                );
+
+                mockSeries.getPointCount.andCallFake(function () {
+                    return testSeries.length;
+                });
+                mockSeries.getDomainValue.andCallFake(function (i) {
+                    return testSeries[i][0];
+                });
+                mockSeries.getRangeValue.andCallFake(function (i) {
+                    return testSeries[i][1];
+                });
+
+                window = new PlotSeriesWindow(
+                    mockSeries,
+                    "testDomain",
+                    "testRange",
+                    1,
+                    testSeries.length
+                );
+            });
+
+            it("provides a window upon a data series", function () {
+                expect(window.getPointCount()).toEqual(4);
+                expect(window.getDomainValue(0)).toEqual(10);
+                expect(window.getRangeValue(0)).toEqual(1);
+            });
+
+            it("looks up using specific domain/range keys", function () {
+                window.getDomainValue(0);
+                window.getRangeValue(0);
+                expect(mockSeries.getDomainValue)
+                    .toHaveBeenCalledWith(1, 'testDomain');
+                expect(mockSeries.getRangeValue)
+                    .toHaveBeenCalledWith(1, 'testRange');
+            });
+
+            it("can be split into smaller windows", function () {
+                var windows = window.split();
+                expect(windows.length).toEqual(2);
+                expect(windows[0].getPointCount()).toEqual(2);
+                expect(windows[1].getPointCount()).toEqual(2);
+                expect(windows[0].getDomainValue(0)).toEqual(10);
+                expect(windows[1].getDomainValue(0)).toEqual(30);
+                expect(windows[0].getRangeValue(0)).toEqual(1);
+                expect(windows[1].getRangeValue(0)).toEqual(9);
+            });
 
         });
     }