docs: Add a unit testing guide and update pytest configuration to specifically target unit tests.

TESTING.md

@@ -0,0 +1,44 @@
+# Unit Testing Guide - be-rbd
+
+This document provides instructions on how to set up and run unit tests for the **be-rbd** project.
+
+## 1. Preparation
+
+### Install Dependencies
+Ensure you have all dependencies installed. This project uses `poetry`.
+
+```bash
+# Install dependencies
+poetry install
+```
+
+## 2. Configuration
+
+### Pytest Configuration
+Ensure the `pytest.ini` file in the root directory points to the `unit` test folder:
+
+```ini
+[pytest]
+testpaths = tests/unit
+python_files = test_*.py
+asyncio_mode = auto
+```
+
+## 3. Running Tests
+
+### Run Unit Tests
+To run all unit tests in the project:
+
+```bash
+poetry run pytest tests/unit
+```
+
+### Run Specific Unit Test File
+```bash
+poetry run pytest tests/unit/test_specific_feature.py
+```
+
+## 4. Best Practices
+
+- **Isolation**: Unit tests should be isolated from external services. Use mocking for APIs and databases.
+- **Async Testing**: Use `@pytest.mark.asyncio` for asynchronous test functions.

pytest.ini

@@ -1,6 +1,6 @@
 [pytest]
 asyncio_mode = auto
-testpaths = tests
+testpaths = tests/unit
 python_files = test_*.py
 filterwarnings =
     ignore::pydantic.PydanticDeprecatedSince20