""" Testing decorators module
"""

import numpy as np
from nose.tools import (assert_true, assert_raises, assert_equal)
from skimage._shared.testing import doctest_skip_parser, test_parallel


def test_skipper():
    def f():
        pass

    class c():

        def __init__(self):
            self.me = "I think, therefore..."

    docstring = \
        """ Header

            >>> something # skip if not HAVE_AMODULE
            >>> something + else
            >>> a = 1 # skip if not HAVE_BMODULE
            >>> something2   # skip if HAVE_AMODULE
        """
    f.__doc__ = docstring
    c.__doc__ = docstring

    global HAVE_AMODULE, HAVE_BMODULE
    HAVE_AMODULE = False
    HAVE_BMODULE = True

    f2 = doctest_skip_parser(f)
    c2 = doctest_skip_parser(c)
    assert_true(f is f2)
    assert_true(c is c2)

    expected = \
        """ Header

            >>> something # doctest: +SKIP
            >>> something + else
            >>> a = 1
            >>> something2
        """
    assert_equal(f2.__doc__, expected)
    assert_equal(c2.__doc__, expected)

    HAVE_AMODULE = True
    HAVE_BMODULE = False
    f.__doc__ = docstring
    c.__doc__ = docstring
    f2 = doctest_skip_parser(f)
    c2 = doctest_skip_parser(c)

    assert_true(f is f2)
    expected = \
        """ Header

            >>> something
            >>> something + else
            >>> a = 1 # doctest: +SKIP
            >>> something2   # doctest: +SKIP
        """
    assert_equal(f2.__doc__, expected)
    assert_equal(c2.__doc__, expected)

    del HAVE_AMODULE
    f.__doc__ = docstring
    c.__doc__ = docstring
    assert_raises(NameError, doctest_skip_parser, f)
    assert_raises(NameError, doctest_skip_parser, c)


def test_test_parallel():
    state = []

    @test_parallel()
    def change_state1():
        state.append(None)
    change_state1()
    assert len(state) == 2

    @test_parallel(num_threads=1)
    def change_state2():
        state.append(None)
    change_state2()
    assert len(state) == 3

    @test_parallel(num_threads=3)
    def change_state3():
        state.append(None)
    change_state3()
    assert len(state) == 6


if __name__ == '__main__':
    np.testing.run_module_suite()
