Restore three tests that only fail on Windows in CI

A small number of tests seem to fail exclusively on Windows CI builds:

- `getFileContentAndPath.test.ts`
- `prepFile.test.ts`
- `getSvgFileData.test.ts`

This might have to do with CRLF or some similar "invisible" problems?

Successfully resolving this would make the tests accurately pass on all test platforms (Ubuntu, Windows...Mac?).