Add some simple load tests

test/README.md

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+# Tests
+
+## Load Tests
+
+1. Install [artillery](https://artillery.io/) from NPM/Yarn/Whatever Javascript package manager is popular this week.
+1. Start an instance of the server on localhost.
+1. `artillery run httpGetTest.yaml` for endpoint load tests.
+1. `artillery run websocketTest.yaml` for websocket load tests.

test/httpGetTest.yaml

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+config:
+  target: 'http://localhost:8080/'
+  
+  ensure:
+    p95: 200
+    maxErrorRate: 1
+
+  phases:
+    - duration: 60
+      arrivalRate: 20
+scenarios:
+  - flow:
+    - get:
+        url: "/hls/stream.m3u8"
+    - get:
+        url: "/status"

test/websocketTest.js

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+module.exports = { createTestMessageObject };
+
+function createTestMessageObject(userContext, events, done) {
+  const randomNumber = Math.floor((Math.random() * 10) + 1);
+  const author = "load-test-user-" + randomNumber
+  const data = {
+    author: author,
+    body: "Test 12345. " + randomNumber,
+    image: "https://robohash.org/" + author + "?size=80x80&set=set3"
+  };
+  // set the "data" variable for the virtual user to use in the subsequent action
+  userContext.vars.data = data;
+  return done();
+}

test/websocketTest.yaml

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+config:
+  target: "ws://localhost:8080/entry"
+  processor: "./websocketTest.js"
+
+  ensure:
+    p95: 200
+    maxErrorRate: 1
+
+  phases:
+    - duration: 30
+      arrivalRate: 10
+  ws:
+    subprotocols:
+      - json
+    headers:
+      Connection: Upgrade
+      Origin: http://localhost:8080
+      Sec-WebSocket-Version: 13
+scenarios:
+  - engine: "ws"
+    flow:
+    - function: "createTestMessageObject"
+    - send: "{{ data }}"
+    - think: 5