tests: add no-torch / Intel Mac test suite (#4646)
* tests: add no-torch / Intel Mac test suite
Add comprehensive test coverage for the no-torch / --no-torch installer
and Studio backend changes introduced in #4624.
Shell tests (tests/sh/test_mac_intel_compat.sh):
- version_ge edge cases (9 tests)
- Architecture detection + Python version resolution (4 tests)
- get_torch_index_url on Darwin (2 tests)
- UNSLOTH_NO_TORCH propagation via SKIP_TORCH (5 tests)
- E2E uv venv creation at Python 3.12 (3 tests)
- E2E torch skip with mock uv shim (4 tests)
- UNSLOTH_NO_TORCH env propagation (4 tests)
- --python override flag parsing + resolution (11 tests)
- --no-torch flag parsing (4 tests)
- SKIP_TORCH unification (3 tests)
- CPU hint printing (2 tests)
Python tests (tests/python/test_no_torch_filtering.py):
- _filter_requirements unit tests with synthetic + real requirements files
- NO_TORCH / IS_MACOS constant parsing
- Subprocess mock of install_python_stack() across platform configs
- install.sh --no-torch flag structural + subprocess tests
Python tests (tests/python/test_studio_import_no_torch.py):
- AST checks for data_collators.py, chat_templates.py, format_conversion.py
- Parametrized venv tests (Python 3.12 + 3.13) for no-torch exec
- Dataclass instantiation without torch
- format_conversion convert functions without torch
- Negative controls (import torch fails, torchao fails)
Python tests (tests/python/test_e2e_no_torch_sandbox.py):
- Before/after import chain tests
- Edge cases (broken torch, fake torch, lazy import)
- Hardware detection without torch
- install.sh logic tests (flag parsing, version resolution)
- install_python_stack filtering tests
- Live server startup tests (opt-in via @server marker)
* fix: address review comments on test suite
- Fix always-true assertion in test_studio_import_no_torch.py (or True)
- Make IS_MACOS test platform-aware instead of hardcoding Linux
- Restore torchvision + torchaudio in server test cleanup (not just torch)
- Include server stderr in skip message for easier debugging
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