move tests to tests directory

package.json

@@ -93,6 +93,7 @@
     "copy-webpack-plugin": "^4.0.0",
     "css-loader": "^0.25.0",
     "dialog-polyfill": "^0.4.4",
+    "enzyme": "^2.6.0",
     "eslint": "^3.12.1",
     "eslint-config-postcss": "^2.0.2",
     "eslint-config-standard": "^6.2.1",
@@ -122,6 +123,7 @@
     "precss": "^1.4.0",
     "pym.js": "^1.1.1",
     "react": "15.3.2",
+    "react-addons-test-utils": "^15.3.1",
     "react-dom": "15.3.2",
     "react-linkify": "^0.1.3",
     "react-mdl": "^1.7.2",