Add unit tests for tests/helpers.py to improve coverage (#9161)

[jalpuche1]

Pull Request Check List

Relates-to: #9161

• [x] Added tests for changed code.
• [ ] Updated documentation for changed code.

Summary

This PR adds new unit tests for existing functions in src/poetry/utils/helpers.py to improve test coverage and ensure consistent behavior across supported platforms.

Covered Functions

The following helper functions are now tested:

• merge_dicts() – verifies recursive dictionary merging
• paths_csv() – ensures correct comma-separated string output
• ensure_path() – validates directory existence handling
• is_dir_writable() – confirms directory write permissions
• pluralize() – tests correct singular/plural word handling
• get_file_hash() – ensures deterministic hash generation
• remove_directory() – verifies safe recursive removal
• directory() – confirms context-manager behavior for directory iteration
• get_real_windows_path() – tested (and auto-skipped on non-Windows systems)

[sourcery-ai[bot]]

Reviewer's Guide

Introduces a new test module tests/test_helpers_additional.py to cover eight helper functions from helpers.py, including object creation, file/directory operations, environment isolation, data transformation, and architecture support, thereby improving unit test coverage.

File-Level Changes

Change	Details	Files
Added tests for package and dependency creation	get_package returns correct Package object get_dependency handles string-based constraints	tests/test_helpers_additional.py
Added tests for file and directory operations	copy_path copies files and directories correctly switch_working_directory changes and restores cwd with_working_directory copies src into dest and cleans up	tests/test_helpers_additional.py
Added tests for environment isolation context	isolated_environment sets new vars and restores original environment	tests/test_helpers_additional.py
Added tests for dictionary flattening	flatten_dict recursively flattens nested dictionaries into dot-notation keys	tests/test_helpers_additional.py
Added tests for architecture variant support	pbs_installer_supported_arch returns true for valid archs and false for invalid ones	tests/test_helpers_additional.py

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