Add comprehensive ZSH testing infrastructure

[Copilot]

Summary

This PR implements a comprehensive testing solution for the ZSH configuration, addressing the requirements in #[issue_number]. The test suite validates that important tools like mise, fzf, and zoxide are properly configured, along with extensive coverage of configuration files, custom functions, aliases, and commands.

Implementation

Test Framework

Created a lightweight shell-based testing framework that doesn't require ZSH to run, making it portable and CI-friendly:

• tests/test_helpers.sh - Core testing utilities with assertion functions (assert_success, assert_equals, assert_contains, assert_file_exists, etc.) and colored output for clear test results
• tests/run_tests.sh - Main test runner that auto-discovers and executes all test files with pattern matching support

Test Coverage (91 Tests)

Integration Tests (15 tests)

• Validates mise, fzf, and zoxide configuration files
• Verifies command check patterns (proper return 1 when commands are missing)
• Ensures configuration files follow minimal, focused structure

Unit Tests (76 tests)

• Functions (26 tests): Validates all custom ZSH functions have proper shebangs, use expected tools (fzf, git, jq, awk), and have correct content
• Configuration (33 tests): Tests main config files (.zshrc, .zshenv, .zprofile), rc.d structure, environment variables, and plugin configuration
• Aliases (6 tests): Verifies alias definitions and syntax
• Commands (11 tests): Tests custom shell functions, fzf/jq integration, and documentation

Usage

# Run all tests
./tests/run_tests.sh

# Run specific test pattern
./tests/run_tests.sh "test_core_tools.sh"

# Run individual test file
bash tests/integration/test_core_tools.sh

CI/CD Integration

Added GitHub Actions workflow (.github/workflows/tests.yml) that runs the full test suite on push/PR to main branch, with support for manual triggers.

Documentation

• Created comprehensive tests/README.md with test structure overview, usage examples, and guide for adding new tests
• Updated main README.md with testing section linking to detailed documentation

Test Results

All 91 tests passing ✓

The implementation provides a solid foundation for ensuring configuration integrity and can be easily extended with additional tests as the configuration evolves.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add tests</issue_title>
<issue_description>Implement ZSH testing solution. The tests should
at minimum make sure important tools like mise, fzf, and zoxide work correctly.

Expand the tests from there. </issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #6

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