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

node_modules/jsondiffpatch/lib/clone.js

@@ -0,0 +1,28 @@
+function cloneRegExp(re) {
+    const regexMatch = /^\/(.*)\/([gimyu]*)$/.exec(re.toString());
+    return new RegExp(regexMatch[1], regexMatch[2]);
+}
+export default function clone(arg) {
+    if (typeof arg !== 'object') {
+        return arg;
+    }
+    if (arg === null) {
+        return null;
+    }
+    if (Array.isArray(arg)) {
+        return arg.map(clone);
+    }
+    if (arg instanceof Date) {
+        return new Date(arg.getTime());
+    }
+    if (arg instanceof RegExp) {
+        return cloneRegExp(arg);
+    }
+    const cloned = {};
+    for (const name in arg) {
+        if (Object.prototype.hasOwnProperty.call(arg, name)) {
+            cloned[name] = clone(arg[name]);
+        }
+    }
+    return cloned;
+}