cricri - Generate test scenarios using unittest

Determine and write all possible test scenarios of finite state machines is a hard task. cricri generates test scenarios from state specification.

What are cricri prerequisites ?

python 3.4 or newer

How to install

$ pip install cricri

Example:

An example to test a state machine.

A is a initial state, call m1 shifts the state from A to B and call m2 shifts the state from A to C

We define each state using TestState subclass:

# Define a base class for scenario step.
class State(TestState):
    pass


class StateA(State, start=True): # start=True because A is initial state.
    def input(self):
        # code to go to initial state 'A'
        type(self).machine = Machine()

    def test_a(self):
        # You can use unittest assert methods.
        ...

class StateB(State, previous=['StateA']): # previous=['StateA'] because we can go to this state from 'A'
    def input(self):
        # code to go to 'B' state from 'A'
        type(self).machine.m1()

    def test_b(self):
        # You can use unittest assert methods.
        ...

# previous=['StateA', 'StateB'] because we can go to this state from 'A' or 'B'.
class StateC(State, previous=['StateA', 'StateB']):

    @previous(['StateA'])
    def input(self):
        # Code to go to 'C' state from 'A'
        type(self).machine.m2()

    @previous(['StateB'])
    def input(self):
        # Code to go to 'C' state from 'B'
        type(self).machine.m1()

    def test_c(self):
        # You can use unittest assert methods.
        ...


# You must to use this statment at the end of module to generate **load_tests** function::
load_tests = State.get_load_tests()

Call python3 -m unittest <test_module_name> to launch test.

This exemple generate two scenarios:

machine = Machine()

test_a()

machine.m1()

test_b()

machine.m1()

test_c()

and:

machine = Machine()

test_a()

machine.m2()

test_c()

For more example, see demo directory

Documentation:

Documentation is online at http://cricri.readthedocs.io