Fix/updated ig api and added tests

[tapiocaboy]

Test Suite Enhancements

This PR adds a comprehensive test suite to the Osintgram project, providing better code reliability and making future contributions easier.

What's New

• Added pytest-based testing framework with proper configuration in pytest.ini
• Created a centralized test fixture system in conftest.py
• Implemented cross-version Python compatibility for tests (works with 3.10 and 3.11)
• Added proper dependency mocking to allow tests to run without installing all dependencies

Added Files

• pytest.ini - Configuration for pytest
• conftest.py - Root-level test setup and dependency mocking
• tests/__init__.py - Package initialization
• tests/conftest.py - Test fixtures and setup
• tests/test_config.py - Tests for configuration handling
• tests/test_osintgram.py - Tests for main Osintgram class
• tests/test_osintgram_mock.py - Mock-based tests for Osintgram
• tests/test_printcolors.py - Tests for terminal color output
• run_tests.py - Convenience script for running tests
• requirements_dev.txt - Development dependencies

Fixed Issues

• Properly mocked external dependencies (geopy, instagram_private_api, prettytable)
• Fixed Python path issues to make tests importable
• Ensured tests can run without network connectivity
• Made tests compatible with different Python versions

Updated Documentation

• Added test running instructions to README.md
• Added Makefile targets for test execution:
  • make test - Run all tests
  • make test-cov - Run tests with coverage
  • make test-docker - Run tests in Docker

Testing

The test suite verifies:

• Configuration loading
• User handling
• Terminal output formatting
• Error handling
• Core functionality of the Osintgram class