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A utility package for making better test assertions

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Asserty

Asserty is a utility package that provides methods for better assertion in testing.

Installation

The package can be installed using pip:

$ pip install asserty

Examples

You make assertions by importing the assert_that function from the asserty package:

from asserty import assert_that

assert_that("str").not_equals("string")
assert_that(5).is_in(range(10))

def myfunc(arg):
    if not isinstance(arg, str):
        raise TypeError()
    return arg+"yay"

assert_that(myfunc).if_called_with(1).raises(TypeError)
assert_that(myfunc).if_called_with("Hey-").returns("Hey-yay")

Outside a test context that does not handle AssertionError you can import the equivalent function called that:

from asserty import that

assert that("str").not_equals("string")
assert that(5).is_in(range(10))

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