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import unittest
from test.test_support import catch_warning, TestSkipped, run_unittest
import warnings
# TODO: This is a hack to raise TestSkipped if -3 is not enabled. Instead
# of relying on callable to have a warning, we should expose the -3 flag
# to Python code somehow
with catch_warning() as w:
callable(int)
if w.message is None:
raise TestSkipped('%s must be run with the -3 flag' % __name__)
class TestPy3KWarnings(unittest.TestCase):
def test_type_inequality_comparisons(self):
expected = 'type inequality comparisons not supported in 3.x.'
with catch_warning() as w:
self.assertWarning(int < str, w, expected)
with catch_warning() as w:
self.assertWarning(type < object, w, expected)
def test_object_inequality_comparisons(self):
expected = 'comparing unequal types not supported in 3.x.'
with catch_warning() as w:
self.assertWarning(str < [], w, expected)
with catch_warning() as w:
self.assertWarning(object() < (1, 2), w, expected)
def test_dict_inequality_comparisons(self):
expected = 'dict inequality comparisons not supported in 3.x.'
with catch_warning() as w:
self.assertWarning({} < {2:3}, w, expected)
with catch_warning() as w:
self.assertWarning({} <= {}, w, expected)
with catch_warning() as w:
self.assertWarning({} > {2:3}, w, expected)
with catch_warning() as w:
self.assertWarning({2:3} >= {}, w, expected)
def test_cell_inequality_comparisons(self):
expected = 'cell comparisons not supported in 3.x.'
def f(x):
def g():
return x
return g
cell0, = f(0).func_closure
cell1, = f(1).func_closure
with catch_warning() as w:
self.assertWarning(cell0 == cell1, w, expected)
with catch_warning() as w:
self.assertWarning(cell0 < cell1, w, expected)
def test_filter(self):
from itertools import ifilter
from future_builtins import filter
expected = 'ifilter with None as a first argument is not supported '\
'in 3.x. Use a list comprehension instead.'
with catch_warning() as w:
self.assertWarning(ifilter(None, []), w, expected)
with catch_warning() as w:
self.assertWarning(filter(None, []), w, expected)
def test_code_inequality_comparisons(self):
expected = 'code inequality comparisons not supported in 3.x.'
def f(x):
pass
def g(x):
pass
with catch_warning() as w:
self.assertWarning(f.func_code < g.func_code, w, expected)
with catch_warning() as w:
self.assertWarning(f.func_code <= g.func_code, w, expected)
with catch_warning() as w:
self.assertWarning(f.func_code >= g.func_code, w, expected)
with catch_warning() as w:
self.assertWarning(f.func_code > g.func_code, w, expected)
def test_builtin_function_or_method_comparisons(self):
expected = ('builtin_function_or_method '
'inequality comparisons not supported in 3.x.')
func = eval
meth = {}.get
with catch_warning() as w:
self.assertWarning(func < meth, w, expected)
with catch_warning() as w:
self.assertWarning(func > meth, w, expected)
with catch_warning() as w:
self.assertWarning(meth <= func, w, expected)
with catch_warning() as w:
self.assertWarning(meth >= func, w, expected)
def assertWarning(self, _, warning, expected_message):
self.assertEqual(str(warning.message), expected_message)
def test_main():
run_unittest(TestPy3KWarnings)
if __name__ == '__main__':
test_main()
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