"""Tests for lazy language parser instantiation in the registry."""
from collections import defaultdict
from chunkhound.core.types.common import Language
from chunkhound.registry import ProviderRegistry
def test_registry_lazily_instantiates_language_parsers(monkeypatch):
"""Ensure parser factories are only invoked when a language is requested."""
class FakeParserFactory:
def __init__(self):
self.calls = defaultdict(int)
def get_available_languages(self):
return {Language.PYTHON: True, Language.JAVA: True}
def create_parser(self, language, cast_config=None):
self.calls[language] += 1
return f"parser-{language.value}"
fake_factory = FakeParserFactory()
monkeypatch.setattr(
"chunkhound.registry.get_parser_factory", lambda: fake_factory
)
registry = ProviderRegistry()
registry._language_parsers.clear()
# Register factories without instantiating parsers.
registry._setup_language_parsers()
assert fake_factory.calls == {}
# First access materializes parser exactly once.
parser_python = registry.get_language_parser(Language.PYTHON)
assert parser_python == "parser-python"
assert fake_factory.calls[Language.PYTHON] == 1
# Second access reuses cached parser.
parser_python_again = registry.get_language_parser(Language.PYTHON)
assert parser_python_again == parser_python
assert fake_factory.calls[Language.PYTHON] == 1
# Another language materializes independently.
parser_java = registry.get_language_parser(Language.JAVA)
assert parser_java == "parser-java"
assert fake_factory.calls[Language.JAVA] == 1
