add first test with jest

package.json

@@ -10,16 +10,7 @@
     "build:examples": "node ./node_modules/@babel/node/bin/babel-node.js ./build/examples/build.js --env=production",
     "release": "yarn build:packages && lerna publish",
     "lint": "eslint ./packages/**/src/**",
-    "prebuild:packages": "yarn lint",
-    "prebuild:examples": "yarn lint"
-  },
-  "babel": {
-    "presets": [
-      "@babel/preset-env"
-    ],
-    "plugins": [
-      "@babel/plugin-syntax-dynamic-import"
-    ]
+    "test": "jest"
   },
   "postcss": {
     "plugins": {
@@ -41,7 +32,9 @@
     "@babel/preset-stage-2": "^7.0.0",
     "@babel/runtime": "^7.1.5",
     "autoprefixer": "^9.3.1",
+    "babel-core": "^7.0.0-bridge.0",
     "babel-eslint": "^10.0.1",
+    "babel-jest": "^23.6.0",
     "babel-loader": "^8.0.4",
     "browser-sync": "^2.26.3",
     "connect-history-api-fallback": "^1.5.0",
@@ -59,6 +52,7 @@
     "http-proxy-middleware": "^0.19.0",
     "http-server": "^0.11.1",
     "imagemin-webpack-plugin": "^2.3.0",
+    "jest": "^23.6.0",
     "lerna": "^3.4.3",
     "mini-css-extract-plugin": "^0.4.4",
     "minimist": "^1.2.0",
@@ -68,6 +62,7 @@
     "postcss": "^7.0.5",
     "postcss-loader": "^3.0.0",
     "postcss-scss": "^2.0.0",
+    "regenerator-runtime": "^0.12.1",
     "rollup": "^0.67.0",
     "rollup-plugin-buble": "^0.19.4",
     "rollup-plugin-commonjs": "^9.2.0",