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/GOVERNANCE.md

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+# `import-in-the-middle` Project Governance
+
+## Collaborators
+
+`import-in-the-middle` core collaborators maintain the
+[nodejs/import-in-the-middle](https://github.com/nodejs/import-in-the-middle)
+GitHub repository.
+The GitHub team for `import-in-the-middle` core collaborators is
+[@nodejs/import-in-the-middle-maintainers](https://github.com/orgs/nodejs/teams/import-in-the-middle-maintainers). 
+Collaborators have commit access to the
+[nodejs/import-in-the-middle](https://github.com/nodejs/import-in-the-middle)
+repository.
+
+Both collaborators and non-collaborators may propose changes to the `import-in-the-middle`
+source code. The mechanism to propose such a change is a GitHub pull request.
+Collaborators review and merge (_land_) pull requests.
+
+## PR Approval
+
+Two collaborators must approve a pull request before the pull request can land.
+Approving a pull request indicates that the collaborator accepts responsibility
+for the change. Approval must be from collaborators who are not authors of the
+change and at least one approval must be from a collaborator outside the authors
+direct team. 
+
+If a collaborator opposes a proposed change, then the change cannot land. Often,
+discussions or further changes result in collaborators removing their
+opposition.