def test_match_anywhere(expression, pattern, expected_results):
expression = expression
pattern = Pattern(pattern)
results = list(match_anywhere(expression, pattern))
assert len(results) == len(expected_results), "Invalid number of results"
for result in expected_results:
assert result in results, "Results differ from expected"
def test_match_anywhere_error():
with pytest.raises(ValueError):
next(match_anywhere(f(x_), f(x_)))