def test_args_call_pos (self):
assert _args(isstring)()
assert _args(isstring)('dharma')
assert _args(isstring)('dharma', 'miles')
assert not _args(isstring)(4, "bad robot!")
assert _and(_args(isstring),
_args(_not(isempty)))('jack', 'sawyer')
assert not _and(_args(isstring),
_args(_not(isempty)))('jack', 'sawyer', '')
def test_not (self):
# no predicates
assert _not()(True)
# single predicate
assert _not(isfalse)(True)
assert _not(istrue)(False)
assert not _not(isempty)('')
# multiple predicates
assert _not(isfalse, isstring)(True)
assert _not(istrue, isstring)(False)
assert not _not(isempty, isfalse)('')
assert not _not(istrue, isstring)(True)
def test_short_circuit (self):
assert not _and(false, fail)()
assert _or(true, fail)()
assert not _not(true, fail)()
def test_composition (self):
assert not _and(_not(isstring), _or(isempty, isatom))('')
assert _and(_not(isstring), _or(isempty, isatom))(())
assert _and(_not(isstring), _or(isempty, isatom))(42)
