0.7 The Apache License 2.0    
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pytest plugin to generate random data inspired by QuickCheck





pytest-quickcheck provides a pytest.mark.randomize function for generating random test data.


 easy_install pytest-quickcheck # or
 pip install pytest-quickcheck

Quick Start

Just pass the signature of function to randomize marker. The signature is represented a tuple consist of argument name and its type.

@pytest.mark.randomize(("i1", "int"), ("i2", "int"), ncalls=1)
def test_generate_ints(i1, i2):

More complex data structure:

 ("d1", "{'x': int, 'y': [str, (int, int)], 'z': {'x': str}}")
def test_generate_dict(d1):

The randomize marker is able to use with parametrize marker.

@pytest.mark.parametrize("prime", [2, 3, 5])
@pytest.mark.randomize(("i1", "int"), ("f1", "float"), ncalls=1)
def test_gen_parametrize_with_randomize_int_float(prime, i1, f1):

Using command line option --randomize restricts only the randomize test.

$ py.test -v --randomize
test session starts
========================================================================================== test_normal SKIPPED test_generate_ints[74-22] PASSED


There some options for each data type:

$ py.test --markers
@pytest.mark.randomize((argname, type), **options): mark the test function with
random data generating any data type.
 There are options for each data type: (see doc for details)
 int: ['min_num', 'max_num']
 float: ['min_num', 'max_num', 'positive']
 str: ['encoding', 'fixed_length', 'max_length', 'str_attrs']

- common option

 ncalls: set the number of calls. Defaults to 3. (e.g. ncalls=5)
 choices: choose from given sequence. (e.g. choices=[3, 5, 7])

- int

 min_num: lower limit for generating integer number. (e.g. min_num=0)
 max_num: upper limit for generating integer number. (e.g. max_num=10)

- float

 min_num: lower limit for generating real number. (e.g. min_num=0.0)
 max_num: upper limit for generating real number. (e.g. max_num=1.0)
 positive: generate only positive real number if set to True. Defaults to False. (e.g. positive=True)

- str

 encoding: generate unicode string encoded given character code. (e.g. encoding="utf-8") # for Python 2.x only
 fixed_length: generate fixed length string. (e.g. fixed_length=8)
 max_length: generate the string less than or equal to max length (e.g. max_length=32)
 str_attrs: generate the string in given letters. set a tuple consist of attribute names in the string module. (e.g. str_attrs=("digits", "punctuation")

Probably, pytest_quickcheck/tests/ is useful for learning how to use these options.
Last updated on April 1st, 2012

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