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

node_modules/abort-controller/polyfill.mjs

@@ -0,0 +1,19 @@
+/*globals self, window */
+import * as ac from "./dist/abort-controller"
+
+/*eslint-disable @mysticatea/prettier */
+const g =
+    typeof self !== "undefined" ? self :
+    typeof window !== "undefined" ? window :
+    typeof global !== "undefined" ? global :
+    /* otherwise */ undefined
+/*eslint-enable @mysticatea/prettier */
+
+if (g) {
+    if (typeof g.AbortController === "undefined") {
+        g.AbortController = ac.AbortController
+    }
+    if (typeof g.AbortSignal === "undefined") {
+        g.AbortSignal = ac.AbortSignal
+    }
+}