Update BasicTestSuite docstring in tests/test_basic.py

[coderabbitai]

Update the docstring for the BasicTestSuite class in tests/test_basic.py with the following expanded documentation:

class BasicTestSuite(context.BasicUsageTestSuite):
    """
    A test suite containing basic test cases for the multicast module.

    This class inherits from context.BasicUsageTestSuite and provides a set of
    unit tests to verify the fundamental functionality and error handling of
    the multicast module.

    Test Methods:
    - test_absolute_truth_and_meaning: An insanity test that always passes.
    - test_Does_Pass_WHEN_Meta_Test: Verifies basic assertion methods.
    - test_Does_Pass_WHEN_Using_Import_From_Syntax: Tests importing the multicast module.
    - test_Error_WHEN_the_help_command_is_called: Checks if the --help option raises an exception.
    - test_IsNone_WHEN_given_corner_case_input: Tests handling of invalid inputs.
    - test_None_WHEN_Nothing: A placeholder for additional tests.
    - test_Skip_UNLESS_linux_only: A test that only runs on Linux platforms.
    - test_Skip_UNLESS_darwin_only: A test that only runs on macOS platforms.

    Note:
    Some tests are conditionally skipped based on the operating system.
    The test methods use various assertion techniques to verify expected behaviors.

    This test suite is designed to catch basic issues and ensure the core
    functionality of the multicast module works as expected across different
    platforms.
    """

This expanded docstring provides a comprehensive overview of the BasicTestSuite class, including its purpose, inheritance, a list of test methods with brief descriptions, and important notes about conditional test execution. It should help developers understand the scope and intent of the test suite at a glance.