In working on developing unit tests for my GF4 project, I'm going to have
to compare expected vs actual results of floating point numbers. This
subject is notoriously difficult to get "right" - there are all kinds of
pitfalls one would never think about. The standard Python library now has
one test for this - math.isclose().
I just learned that pytest provides such a test, packaged up for unit
testing.. Here is an example:
import pytest
PRECISION = 1e-3
def assert_almost_equal():
obtained_value = 99.99
expected_value = 100.00
assert obtained_value == pytest.approx(expected_value, PRECISION)
See What is the best way to compare floats for almost-equality in Python?
<https://stackoverflow.com/questions/5595425/what-is-the-best-way-to-compare-floats-for-almost-equality-in-python>
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