Status: IN
Every solution file contains both the implementation and a `unittest.TestCase` in the same file, runnable via `python solution.py`, with a separate `test_solution.py` for external test harness integration.
Source: entries/2026/06/06/day-of-the-year-solution.md, entries/2026/06/06/decode-the-message-solution.md, entries/2026/06/06/decode-xored-array-solution.md
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