fix: add support for test image generation

[kariemoorman]

Description

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code refactoring
• Performance improvement
• Test addition/modification

Related Issue

Closes #

Changes Made

• Test image generation

Testing

Test Configuration

• OS: MacOS
• Python Version: 3.14

Test Cases

• Unit tests pass locally
• Integration tests pass locally
• Manual testing completed
• Edge cases tested

Test Commands

# Commands used for testing
pytest tests/

Code Quality Commands

mypy src/ghostbit
ruff check .
black .

Screenshots/Output

[Paste output here]

Checklist

Testing

• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published
• I have run make test

Code Quality

• My code follows the project's style guidelines
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have run make format (Black)
• I have run make lint (Ruff)
• I have run make type (MyPy)
• I have run make clean (Clean up test artifacts)

Documentation

• I have updated the documentation accordingly
• I have updated the CHANGELOG.md

Commits

• My commits follow the Conventional Commits specification
• My commit messages are clear and descriptive

Breaking Changes

Additional Notes

Reviewer Notes

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

❌ Patch coverage is 43.33333% with 119 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...hostbit/imagestego/core/image_multiformat_coder.py	26.56%	94 Missing ⚠️
src/ghostbit/imagestego/cli/imagestego_cli.py	30.00%	21 Missing ⚠️
src/ghostbit/audiostego/cli/audiostego_cli.py	91.30%	4 Missing ⚠️

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