[issue35656] More matchers in unittest.mock

[Petter S]

Petter S <petter.strandm...@gmail.com> added the comment:

Yes, something like this:

    class APPROXIMATE:
        """Takes a floating point number and implements approximate equality."""

        def __init__(self, value):
            self.value = value

        def __eq__(self, other):
            return abs(self.value - other) / (abs(self.value) + abs(other)) < 
1e-6

        def __repr__(self):
            return f"APPROXIMATE({self.value})"


Then the following would hold:

    got = {
    "name": "Petter",
    "length": 1.900001
    }

    expected = {
    "name": "Petter",
    "length": APPROXIMATE(1.9)
    }

    assert got == expected

But not

    got["length"] = 1.8
    assert got == expected

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