add test.

test/dashboard2/.postcssrc.js

@@ -0,0 +1,8 @@
+// https://github.com/michael-ciniawsky/postcss-load-config
+
+module.exports = {
+  "plugins": {
+    // to edit target browsers: use "browserlist" field in package.json
+    "autoprefixer": {}
+  }
+}