Add Russian translation for docs/ru/docs/tutorial/testing.md

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* ✅ Refactor OpenAPI tests, move inline, prepare for Pydantic v2 tests

* ✅ Fix test module loading for conditional OpenAPI

* 🐛 Fix missing pytest marker

* ✅ Fix test for coverage

✅ Refactor tests, for consistency and simplification

* fix flask.escape warning

* 📝 Fix highlight in docs for WSGI

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