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

node_modules/@protobufjs/inquire/index.d.ts

@@ -0,0 +1,9 @@
+export = inquire;
+
+/**
+ * Requires a module only if available.
+ * @memberof util
+ * @param {string} moduleName Module to require
+ * @returns {?Object} Required module if available and not empty, otherwise `null`
+ */
+declare function inquire(moduleName: string): Object;