[Telemetry] Add data structure specs

Add specs for data structures which will support resolution
of WTD-784 by retaining all data not yet received by callbacks
(instead of just the very latest) such that plots can ensure
they do not miss streaming data.

platform/telemetry/test/TelemetryTableSpec.js

@@ -0,0 +1,53 @@
+/*global define,Promise,describe,it,expect,beforeEach,waitsFor,jasmine*/
+
+define(
+    ["../src/TelemetryTable"],
+    function (TelemetryTable) {
+        "use strict";
+
+        describe("The telemetry table", function () {
+            var queue;
+
+            beforeEach(function () {
+                // put, isEmpty, dequeue
+                queue = new TelemetryTable();
+            });
+
+            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("overwrites 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 other value" }, b: 42 });
+                expect(queue.poll())
+                    .toBeUndefined();
+            });
+
+            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()).toBeTruthy();
+            });
+
+
+        });
+
+    }
+);