add test infra and a basic record integration test

package.json

@@ -4,7 +4,7 @@
   "description": "record and replay the web",
   "main": "index.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1",
+    "test": "TS_NODE_CACHE=false TS_NODE_FILES=true mocha -r ts-node/register test/**/*.ts",
     "bundle": "rollup --config"
   },
   "repository": {
@@ -21,9 +21,18 @@
   },
   "homepage": "https://github.com/rrweb-io/rrweb#readme",
   "devDependencies": {
+    "@types/chai": "^4.1.6",
+    "@types/mocha": "^5.2.5",
+    "@types/node": "^10.11.7",
+    "@types/puppeteer": "^1.9.0",
+    "chai": "^4.2.0",
+    "jest-snapshot": "^23.6.0",
+    "mocha": "^5.2.0",
+    "puppeteer": "^1.9.0",
     "rollup": "^0.66.6",
     "rollup-plugin-node-resolve": "^3.4.0",
     "rollup-plugin-typescript": "^1.0.0",
+    "ts-node": "^7.0.1",
     "tslib": "^1.9.3",
     "tslint": "^4.5.1",
     "typescript": "^3.1.1"