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Issue Description

Same as eslint/eslint#17962.

If you test with a custom filename that escapes the directory tree in which the test file is located, a spurious error occurs.

Reproduction Repository Link

https://github.com/kirkwaiblinger/typescript-eslint-repro-rule-tester-filename

Repro Steps

1. clone the repo
2. yarn install
3. yarn test

Versions

(latest)