openmct/platform/telemetry/test/TelemetryQueueSpec.js

/*****************************************************************************
 * Open MCT, Copyright (c) 2014-2016, United States Government
 * as represented by the Administrator of the National Aeronautics and Space
 * Administration. All rights reserved.
 *
 * Open MCT is licensed under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0.
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 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 * Open MCT includes source code licensed under additional open source
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define(
    ["../src/TelemetryQueue"],
    function (TelemetryQueue) {

        describe("The telemetry queue", function () {
            var queue;

            beforeEach(function () {
                // put, isEmpty, dequeue
                queue = new TelemetryQueue();
            });

            it("stores elements by key", function () {
                queue.put("a", { someKey: "some value" });
                expect(queue.poll())
                    .toEqual({ a: { someKey: "some value" }});
            });

            it("merges non-overlapping keys", function () {
                queue.put("a", { someKey: "some value" });
                queue.put("b", 42);
                expect(queue.poll())
                    .toEqual({ a: { someKey: "some value" }, b: 42 });
            });

            it("adds new objects for repeated keys", function () {
                queue.put("a", { someKey: "some value" });
                queue.put("a", { someKey: "some other value" });
                queue.put("b", 42);
                expect(queue.poll())
                    .toEqual({ a: { someKey: "some value" }, b: 42 });
                expect(queue.poll())
                    .toEqual({ a: { someKey: "some other value" }  });
            });

            it("reports emptiness", function () {
                expect(queue.isEmpty()).toBeTruthy();
                queue.put("a", { someKey: "some value" });
                queue.put("a", { someKey: "some other value" });
                queue.put("b", 42);
                expect(queue.isEmpty()).toBeFalsy();
                queue.poll();
                expect(queue.isEmpty()).toBeFalsy();
                queue.poll();
                expect(queue.isEmpty()).toBeTruthy();
            });


        });

    }
);