Fix: issue with markdown git pipeline

add: tests module and 1 test example, also tests collaboration md

collaboration/guide/0_repository_setup.md

@@ -14,7 +14,8 @@ repository and configure it for collaboration:
   - Change your
     [repository description](https://stackoverflow.com/questions/7757751/how-do-you-change-a-repository-description-on-github)
   - Add or remove topics from your repository
-  - Update your main README with your group name and an initial overview of your project. (You can change this as much as you want.)
+  - Update your main README with your group name and an initial overview
+    (You can change this as much as you want.)
 - Under settings in your repository select:
   - _Issues_
   - _Discussions_

solutions/tests/README.md

@@ -1 +1,59 @@
 # Tests
+
+This directory contains the unit tests for the project.
+The tests are written using the `unittest` framework.
+
+## Running Tests
+
+To run the tests, use the following command:
+
+```sh
+python -m unittest
+```
+
+This command will automatically discover and run all the test cases in this directory.
+
+## Directory Structure
+
+The tests are organized as follows:
+
+```md
+solutions/
+    tests/
+        __init__.py
+        test_example.py
+```
+
+- `__init__.py`: This file makes the directory a Python package.
+- `test_example.py`: This file contains example test cases.
+
+## Writing Tests
+
+To add new tests, create a new file in the `tests` directory
+and define your test cases using the `unittest` framework.
+
+Here is an example of a simple test case:
+
+```python
+import unittest
+
+class TestExample(unittest.TestCase):
+    def test_addition(self):
+        self.assertEqual(1 + 1, 2)
+
+```
+
+## Test Coverage
+
+Ensure that your tests cover all the critical parts of your codebase.
+Aim for high test coverage to catch potential issues early.
+
+## Contributing
+
+If you would like to contribute to the tests, please follow these guidelines:
+
+1. Write clear and concise test cases.
+2. Ensure that your tests pass before submitting a pull request.
+3. Follow the existing code style and conventions.
+
+Let's maintain a high-quality codebase! 👩‍💻✨🚀

solutions/tests/test_example.py

@@ -0,0 +1,11 @@
+"""Test example module."""
+
+import unittest
+
+
+class TestExample(unittest.TestCase):
+    """Test example class."""
+
+    def test_addition(self):
+        """Test addition method."""
+        self.assertEqual(1 + 1, 2)