Add comprehensive test suite for TechCompressor

- Implement tests for crypto module including AES-256-GCM encryption and decryption.
- Create tests for deflate compression functionality.
- Develop basic GUI tests for TechCompressor application.
- Add performance sanity tests to ensure compression operations complete within reasonable time limits.

Author: DevaanshPathak

.github/workflows/tests.yml

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+name: Tests
+
+on:
+  push:
+    branches: [ main, develop ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        python-version: ['3.10', '3.11', '3.12']
+    
+    steps:
+    - uses: actions/checkout@v3
+    
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
+        cache: 'pip'
+    
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -r requirements.txt
+        pip install pytest pytest-cov
+    
+    - name: Run tests with coverage
+      run: |
+        pytest tests/ -v --cov=techcompressor --cov-report=xml --cov-report=term
+    
+    - name: Upload coverage
+      uses: codecov/codecov-action@v3
+      if: matrix.os == 'ubuntu-latest' && matrix.python-version == '3.11'
+      with:
+        file: ./coverage.xml
+        fail_ci_if_error: false
+    
+    - name: Run benchmark (quick)
+      run: |
+        python bench.py --quick

MANIFEST.in

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+include LICENSE
+include README.md
+include requirements.txt
+include bench.py
+recursive-include tests *.py
+recursive-include techcompressor *.py