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

node_modules/import-in-the-middle/test/hook/static-import-package-internals.mjs

@@ -0,0 +1,15 @@
+import Hook from '../../index.js'
+import { Report } from 'c8/index.js'
+import path from 'path'
+import { fileURLToPath } from 'url'
+import { strictEqual, notStrictEqual } from 'assert'
+
+const c8Dir = path.join(path.dirname(fileURLToPath(import.meta.url)), '..', '..', 'node_modules', 'c8')
+
+Hook(['c8'], (exports, name, baseDir) => {
+  strictEqual(name, 'c8')
+  strictEqual(baseDir, c8Dir)
+  exports.Report = () => 42
+})
+
+notStrictEqual(Report({}), 42)