Phase-specific unit, language, negative, memory, differential, integration, and fixture directories live here.

• tests/unit/ — host GCC C unit tests (allocator through builtins).
• tests/language/ — advanced Language Level 0.1 scripts executed by pythonami, checked against tests/fixtures/language/*.expected.txt via make language-test.
• tests/fixtures/ — expected stdout for language/example scripts (print_values, test_features, language suites).
• tests/integration/host/run_language_check.sh — runs a script and diffs stdout to its fixture.
• tests/negative/, tests/differential/, tests/integration/amiga/ — reserved for rejected-input, CPython-diff, and Amiga emulator checks.