File: comparison.py

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import pytest
import numpy as np

def compare_with_pytest_approx(quantity, expected_values, rel_tol):
    """
    Cast inputted objects to numpy arrays and assert equivalence via
    pytest.approx with the requested relative tolerance
    """
    quantity, expected_values = map(np.asarray, [quantity, expected_values])
    assert quantity == pytest.approx(expected_values, rel=rel_tol)