Create single method to assert value and type (e.g. float != Decimal)

[codyfletcher]

Hi Brian (et al.) 👋

I'm a big fan of this package, particularly when doing a lot of asserts when converting a large dict to a non primitive type/class instance. I thought about creating a PR, but thought this would be worth a discussion. I'm trying to assert that a value has been correctly cast to Decimal in a single check.

All example tests below assume the following imports:

from decimal import Decimal

import pytest_check as check

Some examples that illustrate the paradigm with the currently available options

Test 1 — This test passes, but does not check if the type is correct.

def test__use__check_equal():
    float_input = 1.25

    decimal_value = Decimal(float_input)

    check.equal(float_input, decimal_value) # Passes

Test 2 — This test passes, but requires 2 checks, which is cumbersome when you are converting a lot of values

def test__use__check_equal__and__is_instance():
    float_input = 1.25

    decimal_value = Decimal(float_input)

    check.equal(float_input, decimal_value) # Passes
    check.is_instance(decimal_value, Decimal) # Passes

Test 3 — This (understandably) fails with the message assert Decimal('1.25') is Decimal('1.25')

def test__use__check_is_():

    float_input = 1.25

    decimal_value = Decimal(float_input)

    check.is_(decimal_value, Decimal(1.25)) # Fails

This is my attempt at a proposed addition. Not great, but figured it might get the conversation rolling.

A passing test...

def test__use__check_equal_with_type__show_passing_example():

    float_input = 1.25

    decimal_value = Decimal(float_input)

    check.equal_with_type(decimal_value, Decimal(1.25)) # Passes

A failing test...

def test__use__check_equal_with_type__show_failing_example():

    float_input = 1.25

    decimal_value = Decimal(float_input)

    check.equal_with_type(decimal_value, 1.25) # Fails

Implementation might look something like

@check_func
def equal_with_type(a, b, msg=""):
    assert a == b and type(a) is type(b), msg