76 lines
3 KiB
Python
76 lines
3 KiB
Python
import ast
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import re
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import types
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from pathlib import Path
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import pytest
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def _load_change_system_message():
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# Extract just _change_system_message from chat_templates.py so the test runs
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# without importing unsloth (which needs unsloth_zoo / a GPU). Same pattern as
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# tests/saving/test_is_gpt_oss_detection.py.
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source = Path(__file__).parents[2] / "unsloth" / "chat_templates.py"
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tree = ast.parse(source.read_text(encoding = "utf-8"))
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funcs = [
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node
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for node in tree.body
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if isinstance(node, ast.FunctionDef) and node.name == "_change_system_message"
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]
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namespace = {
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"re": re,
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"logger": types.SimpleNamespace(warning_once = lambda *a, **k: None),
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"DEFAULT_SYSTEM_MESSAGE": {"unsloth": "You are a helpful assistant to the user"},
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}
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module = ast.Module(body = funcs, type_ignores = [])
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ast.fix_missing_locations(module)
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exec(compile(module, str(source), "exec"), namespace)
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return namespace["_change_system_message"]
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CUSTOM = "mycustom" # not in DEFAULT_SYSTEM_MESSAGE -> no predefined default
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def test_custom_template_fills_placeholder():
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# A custom template with a {system_message} placeholder must be filled, not
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# left with the literal placeholder.
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fn = _load_change_system_message()
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template, used = fn("System: {system_message}\nUser:", CUSTOM, "You are a pirate")
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assert template == "System: You are a pirate\nUser:"
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assert "{system_message}" not in template
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assert used == "You are a pirate"
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def test_custom_template_preserves_backslashes():
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# Why str.replace and not re.sub: a system message with backslashes (Windows
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# paths, LaTeX, group-like text) must be inserted verbatim. re.sub treats the
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# replacement specially -- r"C:\Users" raises bad-escape, r"\1" is a group ref.
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fn = _load_change_system_message()
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for msg in (r"C:\Users\me", r"\frac{a}{b}", r"see \1 here"):
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template, used = fn("System: {system_message}", CUSTOM, msg)
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assert template == f"System: {msg}"
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assert used == msg
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def test_custom_template_requires_system_message():
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# A custom template with a placeholder but no system message must raise,
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# rather than silently leaving the placeholder in.
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fn = _load_change_system_message()
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with pytest.raises(ValueError):
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fn("System: {system_message}", CUSTOM, None)
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def test_custom_template_without_placeholder_unchanged():
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fn = _load_change_system_message()
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template, used = fn("System: fixed", CUSTOM, "ignored")
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assert template == "System: fixed"
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def test_predefined_template_uses_default_then_override():
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# Predefined templates with a default are unaffected by the change.
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fn = _load_change_system_message()
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t1, u1 = fn("System: {system_message}", "unsloth", None)
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assert t1 == "System: You are a helpful assistant to the user"
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t2, u2 = fn("System: {system_message}", "unsloth", "Custom override")
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assert t2 == "System: Custom override"
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assert u2 == "Custom override"
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