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import pytest
from parso.grammar import load_grammar
from parso import utils
def test_load_inexisting_grammar():
# We support future grammars assuming future compatibility,
# but we don't know how to parse old grammars.
with pytest.raises(NotImplementedError):
load_grammar(version='1.5')
def test_load_grammar_uses_older_syntax():
load_grammar(version='4.0')
def test_load_grammar_doesnt_warn(each_version):
load_grammar(version=each_version)
@pytest.mark.parametrize(('string', 'result'), [
('2', (2, 7)), ('3', (3, 6)), ('1.1', (1, 1)), ('1.1.1', (1, 1)), ('300.1.31', (300, 1))
])
def test_parse_version(string, result):
assert utils._parse_version(string) == result
@pytest.mark.parametrize('string', ['1.', 'a', '#', '1.3.4.5'])
def test_invalid_grammar_version(string):
with pytest.raises(ValueError):
load_grammar(version=string)
def test_grammar_int_version():
with pytest.raises(TypeError):
load_grammar(version=3.8) # type: ignore
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