openmct/platform/features/plot/test/elements/PlotUpdaterSpec.js

/*global define,Promise,describe,it,expect,beforeEach,waitsFor,jasmine,Float32Array*/

/**
 * MergeModelsSpec. Created by vwoeltje on 11/6/14.
 */
define(
    ["../../src/elements/PlotUpdater"],
    function (PlotUpdater) {
        "use strict";

        describe("A plot updater", function () {
            var mockSubscription,
                testDomain,
                testRange,
                testDomainValues,
                testRangeValues,
                updater;

            function makeMockDomainObject(id) {
                var mockDomainObject = jasmine.createSpyObj(
                    "object-" + id,
                    [ "getId", "getCapability", "getModel" ]
                );
                mockDomainObject.getId.andReturn(id);
                return mockDomainObject;
            }

            beforeEach(function () {
                var ids = [ 'a', 'b', 'c' ],
                    mockObjects = ids.map(makeMockDomainObject);

                mockSubscription = jasmine.createSpyObj(
                    "subscription",
                    [ "getDomainValue", "getRangeValue", "getTelemetryObjects" ]
                );
                testDomain = "testDomain";
                testRange = "testRange";
                testDomainValues = { a: 3, b: 7, c: 13 };
                testRangeValues = { a: 123, b: 456, c: 789 };

                mockSubscription.getTelemetryObjects.andReturn(mockObjects);
                mockSubscription.getDomainValue.andCallFake(function (mockObject) {
                    return testDomainValues[mockObject.getId()];
                });
                mockSubscription.getRangeValue.andCallFake(function (mockObject) {
                    return testRangeValues[mockObject.getId()];
                });

                updater = new PlotUpdater(
                    mockSubscription,
                    testDomain,
                    testRange,
                    1350 // Smaller max size for easier testing
                );
            });

            it("provides one buffer per telemetry object", function () {
                expect(updater.getLineBuffers().length).toEqual(3);
            });

            it("changes buffer count if telemetry object counts change", function () {
                mockSubscription.getTelemetryObjects
                    .andReturn([makeMockDomainObject('a')]);
                updater.update();
                expect(updater.getLineBuffers().length).toEqual(1);
            });

            it("can handle delayed telemetry object availability", function () {
                // The case can occur where getTelemetryObjects() returns an
                // empty array - specifically, while objects are still being
                // loaded. The updater needs to be able to cope with that
                // case.
                var tmp = mockSubscription.getTelemetryObjects();
                mockSubscription.getTelemetryObjects.andReturn([]);

                // Reinstantiate with the empty subscription
                updater = new PlotUpdater(
                    mockSubscription,
                    testDomain,
                    testRange
                );

                // Should have 0 buffers for 0 objects
                expect(updater.getLineBuffers().length).toEqual(0);

                // Restore the three objects the test subscription would
                // normally have.
                mockSubscription.getTelemetryObjects.andReturn(tmp);
                updater.update();

                // Should have 3 buffers for 3 objects
                expect(updater.getLineBuffers().length).toEqual(3);
            });

        });
    }
);