docs: update Python coding guidelines to allow for Pytest test classes. It helps to make the code more readable and maintainable. Also, makes it possible to write shorter test method names to conform to our rules

Author: jentyk

.github/copilot-instructions.md

@@ -6,6 +6,7 @@ applyTo: '**/*.py'
 # Python Coding Conventions
 
 ## General Instructions
+
 - All configuration **must be provided via environment variables**.
 - Do not hardcode configuration values.
 - Write maintainable, readable, and predictable code.
@@ -17,23 +18,29 @@ applyTo: '**/*.py'
 - Use consistent naming conventions and follow language-specific best practices.
 
 ## Python Instructions
+
 - Use type annotations (PEP 484) - except in the `tests/` folder.
-- All public functions, methods, and classes **must include [Google-style docstrings](https://google.github.io/styleguide/pyguide.html)**.
+- All public functions, methods, and classes **must
+  include [Google-style docstrings](https://google.github.io/styleguide/pyguide.html)**.
 - **Do not add inline comments**; rely on clear code and docstrings instead.
 - Function and variable names must be explicit and intention-revealing.
-- `pyproject.toml` is the source of truth for code quality rules. Generated code must not violate any configured rules.
+- `pyproject.toml` is the source of truth for code quality rules. Generated code must not violate
+  any configured rules.
 - **ruff** is the primary linter for general Python style and best practices.
 - **flake8** is used exclusively to run:
-  - `wemake-python-styleguide` - Enforces strict Python coding standards ([docs](https://wemake-python-styleguide.readthedocs.io/en/latest/))
+  - `wemake-python-styleguide` - Enforces strict Python coding
+    standards ([docs](https://wemake-python-styleguide.readthedocs.io/en/latest/))
   - `flake8-aaa` - Validates the AAA pattern in tests
 - Follow PEP 8 unless explicitly overridden by ruff.
 - Prefer simple, explicit code over clever or compact implementations.
 
 ## Testing
+
 - Use pytest only.
-- Tests must be written as **functions**, not classes.
+- Tests classes must use the `Test` prefix.
 - Test files and functions must use the `test_` prefix.
-- Follow ***AAA(Arrange - Act - Assert)*** strictly. See the [flake8-aaa documentation](https://flake8-aaa.readthedocs.io/en/stable/index.html).
+- Follow ***AAA(Arrange - Act - Assert)*** strictly. See
+  the [flake8-aaa documentation](https://flake8-aaa.readthedocs.io/en/stable/index.html).
 - Do **not** use `if` statements or branching logic inside tests.
 - Prefer fixtures over mocks whenever possible.
 - Avoid duplicating test logic; extract shared setup into fixtures.