import mock
from nose.tools import assert_true
import math

class ClassUnderTest():
    def function_under_test():
        return

@mock.patch('math.pi', mock.MagicMock()) # delete to get expected.out
class Tests():
    """ $ nosetests silentfail.py """
    
    def test_generator_never_run(arg):
        """ this test is never executed. nose reports it as "OK" """
        assert_true(True)
        yield

    def test_generator_should_fail(arg):
        """ this test is never executed. nose reports it as "OK" """
        assert_true(False)
        yield

    def test_nongenerator_is_run(arg):
        """ this test is executed; it passes """
        assert_true(True)

    def test_nongenerator_should_fail(arg):
        """ this test is executed and fails, just as expected """
        assert_true(False)