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/fixtures/esm-exports.txt

@@ -0,0 +1,32 @@
+// Exporting declarations
+export let name1, name2/*, … */; // also var //| name1,name2
+export const name1 = 1, name2 = 2/*, … */; // also var, let //| name1,name2
+export function functionName() { /* … */ } //| functionName
+export class ClassName { /* … */ } //| ClassName
+export function* generatorFunctionName() { /* … */ } //| generatorFunctionName
+export const { name1, name2: bar } = o; //| name1,bar
+export const [ name1, name2 ] = array; //| name1,name2
+
+// Export list
+let name1, nameN; export { name1, /* …, */ nameN }; //| name1,nameN
+let variable1, variable2, nameN; export { variable1 as name1, variable2 as name2, /* …, */ nameN }; //| name1,name2,nameN
+let variable1; export { variable1 as "string name" }; //| string name
+let name1; export { name1 as default /*, … */ }; //| default
+
+// Default exports
+export default expression; //| default
+export default function functionName() { /* … */ } //| default
+export default class ClassName { /* … */ } //| default
+export default function* generatorFunctionName() { /* … */ } //| default
+export default function () { /* … */ } //| default
+export default class { /* … */ } //| default
+export default function* () { /* … */ } //| default
+
+// Aggregating modules
+export * from "module-name"; //| * from module-name
+export * as name1 from "module-name"; //| name1
+export { name1, /* …, */ nameN } from "module-name"; //| name1,nameN
+export { import1 as name1, import2 as name2, /* …, */ nameN } from "module-name"; //| name1,name2,nameN
+export { default, /* …, */ } from "module-name"; //| default
+export { default as name1 } from "module-name"; //| name1
+