papylon 0.6.1

Random testing for Python

Papylon

Papylon is a Python library for random testing of program properties.

Example

We can write a simple property with Python code:

from papylon.prop import for_all
from papylon.arbitrary import arb_list, arb_int
from papylon.checker import check

# reversed and reversed list is the same of the original list
p1 = for_all([arb_list(arb_int(), max_length=20)],
             lambda x: list(reversed(list(reversed(x)))) == x)
check(p1)

When we run the script above, we can see the result as following:

OK, passed 100 tests.

If a property failed, Papylon reports which arbitrary(s) made it failed:

import math

p2 = for_all([arb_int()], lambda n: math.sqrt(n*n) == n)
check(p2)

Falsified after 2 tests (31 shrinks):
> [-1]

Build status

Changes

0.6 (2015-11-23)

• add check_and_assert function into papylon.checker module

• add Properties class into papylon.prop module

• add check_all function into papylon.checker module

• modify papylon.gen module to use generator

0.5 (2015-01-16)

• implement the shrinking system

• add from_gen_shrink function into papylon.arbitrary module

0.4 (2014-12-23)

• add such_that method into papylon.gen.Gen class

• add constant function into papylon.gen module

• support .whl files instead of .egg files in packaging

0.3 (2014-12-13)

• modify ArbFloat to use the format of IEEE 754

• add ArbDate, arb_date and from_gen into papylon.arbitrary module

0.2 (2014-11-30)

• add one_of, choose, frequency and map functions into papylon.gen module

• add ArbStr and arb_str into papylon.arbitrary module

0.1 (2014-11-25)

• first release