Tests added, see the documentation in the tests directory for details. Improved the socket code.

tests/requirements.txt

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+# Test dependencies for Fenrir screen reader
+# Install with: pip install -r tests/requirements.txt
+
+# Core testing framework (required)
+pytest>=7.0.0
+
+# Optional but recommended plugins
+pytest-cov>=4.0.0          # Coverage reporting (pytest --cov)
+pytest-mock>=3.10.0        # Enhanced mocking utilities
+pytest-timeout>=2.1.0      # Timeout for hanging tests (pytest --timeout)
+pytest-xdist>=3.0.0        # Parallel test execution (pytest -n auto)
+
+# Additional testing utilities (optional)
+freezegun>=1.2.0           # Time mocking
+responses>=0.22.0          # HTTP mocking (for future web features)
+
+# Minimal install (just pytest):
+#   pip install pytest
+#
+# Full install (all features):
+#   pip install -r tests/requirements.txt