Update test framework: fix run_tests.py to support all test files, add auto-import-check for test files

node_modules/digest-fetch/webpack.config.js

@@ -0,0 +1,39 @@
+require("babel-polyfill");
+const webpack  = require('webpack')
+const path = require('path')
+
+module.exports = {
+  mode: 'production',
+  target: "web",
+  context: path.join(__dirname, './digest-fetch-src.js'),
+  entry: [
+    "babel-polyfill",
+    path.join(__dirname, './digest-fetch-src.js')
+  ],
+  output: {
+    uniqueName: 'digest-fetch.js',
+    path: path.join(__dirname, '.'),
+    filename: 'digest-fetch.js',
+    globalObject: 'this'
+  },
+  module: {
+    rules: [
+      {
+        test    : /\.js$/,
+        exclude : /(node_modules|build|dist\/)/,
+        loader  : 'babel-loader',
+        options : { presets: ["@babel/preset-env"] }
+      }
+    ]
+  },
+  resolve: {
+    extensions: ['.webpack-loader.js', '.web-loader.js', '.loader.js', '.js'],
+    modules: [
+      path.join(__dirname, './node_modules'),
+      __dirname,
+    ],
+  },
+  optimization: {
+    minimize: true,
+  },
+};